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Alcatel 7515 Media Gateway Product Description
Release 2.0
3FZ08058AAAA Edition 01
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3FZ08058AAAA Edition 01
ABOUT THIS DOCUMENT ......................................................................................................................................... 6
1 PRODUCT OVERVIEW................................................................................................................................. 7
1.1 INTRODUCTION............................................................................................................................................... 8 1.2 ALCATEL 7515 MEDIA GATEWAY KEY BENEFITS ........................................................................................11 1.3 ALCATEL 7515 MEDIA GATEWAY FEATURES .............................................................................................. 12 1.3.1 GENERAL FEATURES ................................................................................................................................... 12 1.3.2 VOICE, FACSIMILE, AND PUBLIC SWITCHED TELEPHONE NETWORK FEATURES......................................... 14 1.3.3 DENSITY AND SCALABILITY........................................................................................................................ 15 1.3.4 PERFORMANCE............................................................................................................................................ 15 1.4 MANAGEMENT.............................................................................................................................................. 16 1.5 APPLICATIONS .............................................................................................................................................. 16 1.5.1 EMERGING SERVICE PROVIDERS: TRUNK TOLL BYPASS APPLICATION ....................................................... 16 1.5.2 COMPETITIVE ACCESS PROVIDERS: VOIP FOR BROADBAND ACCESS......................................................... 17
2 ARCHITECTURE AND HARDWARE ....................................................................................................... 19
2.1 INTRODUCTION............................................................................................................................................. 20 2.2 ARCHITECTURE ............................................................................................................................................ 20 2.2.1 SOFTWARE MODULES.................................................................................................................................. 21 2.2.2 CENTRAL FORWARDING .............................................................................................................................. 22 2.2.3 VOICE PROCESSING..................................................................................................................................... 23 2.3 SYSTEM COMPONENTS................................................................................................................................. 23 2.4 MAINBOARD MODULES................................................................................................................................ 25 2.4.1 SYSTEM CONTROL MODULE (SCM) ........................................................................................................... 25 2.4.2 CIRCUIT PROCESSING MODULE................................................................................................................... 25 2.4.3 PACKET PROCESSING MODULE ................................................................................................................... 27 2.4.4 ALARM MODULE......................................................................................................................................... 27 2.4.5 CLOCK MODULE ......................................................................................................................................... 28 2.4.6 POWER SUPPLIES......................................................................................................................................... 28 2.5 REAR TRANSITION MODULE........................................................................................................................ 29 2.6 FAN TRAYS .................................................................................................................................................... 29 2.7 VOICE/FAX PROCESSING MODULES ............................................................................................................ 30 2.8 ALCATEL 7515 MEDIA GATEWAY CONFIGURATIONS.................................................................................. 31 2.9 HIGH AVAILABILITY ..................................................................................................................................... 33 2.10 DIAGNOSTICS.............................................................................................................................................. 33
FEATURES AND SERVICES............................................................................................................................. 34
3.1 INTRODUCTION............................................................................................................................................. 35 3.2 INTERFACES SUPPORTED.............................................................................................................................. 35 3.3 CONNECTION CONTROL AND SIGNALING.................................................................................................... 36 3.4 PROTOCOLS SUPPORTED.............................................................................................................................. 37 3.4.1 MEGACO V1.0 ............................................................................................................................................. 37 3.4.2 SIGTRAN......................................................................................................................................................... 41 3.4.2.1 SCTP........................................................................................................................................................... 42 3.4.2.2 IUA............................................................................................................................................................. 43 3.4.2.3 MULTI–VENDOR INTEROPERABILITY.......................................................................................................... 45 3.5 VOICEBAND SERVICES.................................................................................................................................. 45
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3FZ08058AAAA Edition 01
3.5.1 SILENCE SUPPRESSION ................................................................................................................................ 46 3.5.2 COMFORT NOISE GENERATION.................................................................................................................... 46 3.5.3 ECHO CANCELLATION................................................................................................................................. 46 3.5.4 FACSIMILE/MODEM BYPASS........................................................................................................................ 47 3.5.5 FACSIMILE RELAY ................................................................................................................................. 47 3.6 REDUNDANCY, RELIABILITY, AND AVAILABILITY ....................................................................................... 48 3.6.1 FAULT TOLERANT APPLICATION MANAGEMENT ......................................................................................... 48 3.6.2 CHASSIS MANAGEMENT MODULE PROCESS ............................................................................................... 49 3.6.3 REDUNDANT EXTERNAL CLOCK ................................................................................................................. 49 3.6.4 REDUNDANT SIGNALING............................................................................................................................. 50 3.6.5 REDUNDANT DATA................................................................................................................................ 50 3.7 IP SERVICES.................................................................................................................................................. 50 3.7.1 INTERNET PROTOCOLS ................................................................................................................................ 51 3.7.2 ROUTING INFORMATION PROTOCOL............................................................................................................ 51 3.7.3 OPEN SHORTEST PATH FIRST....................................................................................................................... 51 3.8 DOMAIN NAME SERVICE .............................................................................................................................. 52
4 OAM&P........................................................................................................................................................... 52
4.1 INTRODUCTION............................................................................................................................................. 53 4.2 ON–BOARD MANAGEMENT.......................................................................................................................... 53 4.2.1 FAULT MANAGEMENT ................................................................................................................................. 53 4.2.2 CONFIGURATION MANAGEMENT................................................................................................................. 54 4.2.3 PERFORMANCE MANAGEMENT ................................................................................................................... 54 4.2.4 SECURITY MANAGEMENT ........................................................................................................................... 55 4.3 ELEMENT MANAGEMENT............................................................................................................................. 56 4.3.1 COMMAND LINE INTERFACE ....................................................................................................................... 56 ABBREVIATIONS..................................................................................................................................................... 57 APPENDIX A SPECIFICATIONS............................................................................................................................ 60 APPENDIX B STANDARDS ................................................................................................................................... 61 APPENDIX C PRODUCT LIST .............................................................................................................................. 64 FIGURE:
FIGURE 1 NEXT GENERATION NETWORK MODEL................................................................................... 8
FIGURE 2 ROLE OF ALCATEL 7515 MEDIA GATEWAY WITHIN NGN...................................................... 9
FIGURE 3 ALCATEL 7515 MEDIA GATEWAY IN A TOLL BYPASS APPLICATION................................. 17
FIGURE 4 ALCATEL 7515 MEDIA GATEWAY SUPPORTING VOIP BROADBAND APPLICATIONS..... 18
FIGURE 5 A7515 NON-REDUNDANCY SYSTEM ARCHITECTURE OVERVIEW .................................. 20
FIGURE 6 SOFTWARE MODULES IN AN ALCATEL 7515 MEDIA GATEWAY......................................... 21
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FIGURE 7 CENTRAL IP FORWARDING........................................................................................................ 23
FIGURE 8 ALCATEL 7515 MEDIA GATEWAY REAR VIEW...................................................................... 24
FIGURE 9 ALCATEL 7515 MEDIA GATEWAY FRONT VIEW ................................................................... 24
FIGURE 10 INTERFACES SUPPORTED......................................................................................................... 35
FIGURE 11 PROTOCOLS SUPPORTED BY AN ALCATEL 7515 MEDIA GATEWAY ................................ 37
FIGURE 12 MEGACO CALL FLOW ............................................................................................................... 41
FIUGRE 13 PROTOCOL STACK DIAGRAM ................................................................................................. 42
TABLE:
TABLE 1 RELATED DOCUMENTS ................................................................................................................... 6
TABLE 2 ALCATEL 7515 MEDIA GATEWAY CAPACITY .............................................................................. 9
TABLE 3 ALCATEL 7515 MEDIA GATEWAY.....................................................................................................11
TABLE 4 ALCATEL 7515 MEDIA GATEWAY GENERAL FEATURES ........................................................ 12
TABLE 5 ALCATEL 7515 MEDIA GATEWAY EXAMPLE CONFIGURATIONS ......................................... 15
TABLE 6 ALCATEL 7515 MEDIA GATEWAY PERFORMANCE.................................................................. 15
TABLE 7 SOFTWARE MODULE FUNCTIONS .............................................................................................. 21
TABLE 8 SYSTEM CONTROL MODULE DETAILS...................................................................................... 25
TABLE 9 MAIN BOARD WITH T1/E1 INTERFACE ...................................................................................... 26
TABLE 10 PACKET PROCESSING MODULE CHARACTERISTICS ............................................................. 27
TABLE 12 PM-VPM-480 MODULE DETAILS................................................................................................. 30
TABLE 13 VOIP FUNCTIONS PROCESSED BY THE MODULES................................................................ 31
TABLE 14 THE BOARD CONFIGURATION................................................................................................. 32
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TABLE 15 MEGACO MESSAGES SUPPORTED............................................................................................ 38
TABLE 16 REAL–TIME TRANSPORT PROTOCOL ID FORMAT ............................................................... 40
TABLE 17 IUA SUPPORTS THE FOLLOWING MESSAGES:....................................................................... 43
TABLE 18 CODECS SUPPORTED ................................................................................................................... 45
TABLE 19 ECHO CANCELLATION SUPPORTED ........................................................................................ 47
TABLE 20 OPEN SHORTEST PATH FIRST AREA TYPES SUPPORTED.................................................... 51
TABLE 21 SYSTEM STATISTICS PROVIDED ............................................................................................... 54
TABLE 22 OPERATIONAL STATISTICS ........................................................................................................ 55
TABLE 23 ALCATEL 7515 MEDIA GATEWAY PHYSICAL SPECIFICATIONS.......................................... 60
TABLE 24 PRODUCT NUMBERS FOR HARDWARE MODULES................................................................ 64
TABLE 25 PRODUCT NUMBERS FOR EQUIPMENT AND SPARES........................................................... 64
TABLE 26 PART NUMBERS OF CABLES AND ACCESSORY KITS ............................................................ 65
TABLE 27 PART NUMBER OF SOFTWARE................................................................................................... 65
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About this Document
Scope This Product Description introduces the Alcatel 7515 Media Gateway, Release 2.0,and describes how it connects circuit switched telephone networks to Ethernet packet switching networks. The document presents an overview of Alcatel 7515 Media Gateway, focusing on it Voice over IP (VoIP) and Fax over IP (FoIP) trunking gateway applications.
Readership This document is intended to be used by network planners, and other desiring to gain
an overview of the 7515 Media Gateway as a VoIP or FoIP trunking gateway.
Contents in Brief This document contains the following chapters: Chapter 1
Product Overview describes the features and key benefits of on Alcatel 7515 Media Gateway,as well as gateway management and applications
Chapter 2 Functional Architecture and Software describes the architecture and software system components of an Alcatel 7515 Media Gateway
Chapter 3 Features and Services describes features and services supported by the Alcatel 7515 Media Gateway
Chapter 4 Operation, Administration Maintenance and Provisioning provides information concerning Operations, Administration, Maintenance and system configuration.
Related Documents Table1 lists the documentation that is available for the Alcatel 7515 Media Gateway Release 2.0.
Title Part Number
Alcatel 7515 Media Gateway Installation and Configuration Guide
3FZ08061AAAA
A7515 Media Gateway User Manual 3FZ08059AAAA
A7515 Media Gateway GEM User Guide 3FZ08060AAAA
Table 1 Related Documents
Trademarks The Alcatel word and Alcatel logo are registered trademarks and service marks of Alcatel.
All other trademarks are the property of their respective owners.
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1 Product Overview
This chapter provides an overview of the Alcatel 7515 Media Gateway product.
The following sections are presented:
Introduction Alcatel 7515 Media Gateway Key Benefits Alcatel 7515 Media Gateway Features Management Applications
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1.1 Introduction
The Alcatel 7515 Media Gateway (MG) is an industry leading multi-service gateway that supports IP-based voice, fax, data and trunk and access signaling gateway services on any port at any time. The Alcatel 7515 MG offers a rich set of services in a very compact two-rack unit. This cost-effective platform is ideally suited for distributed deployment in multi-service next generation network (NGN) points of presence (PoPs). As one of the key elements of Alcatel’s NGN solution, the Alcatel 7515 MG provides seamless inter-working of voice connections between the public switched telephone network (PSTN) or Integrated Service Digital Network(ISDN) and IP networks. Featuring a reliable hardware platform with advanced digital signal processor (DSP) technology and IP forwarding architecture, the Alcatel 7515 MG offers high performance packet voice processing and signaling. Thanks to the use of open standard protocols, the Alcatel 7515 MG can be integrated into any multi-vendor next generation network. With the Alcatel 7515 MG, service providers can address today’s challenges while evolving toward tomorrow’s NGN.
0105_fig1_ed02
Alcatel 7515Media Gateway
TDM
SoftswitchTDM TDM
SS7
PacketNetwork
SS7
Call Control & Services
Int
erf
ac
Int
erf
acTDM
Alcatel 7515 Media Gateway
figure 1 Next Generation Network Model
The NGN architecture comprises the following layers:
Services and Management layer, which delivers services and applications, independent of network infrastructure
Signaling and Control layer, which manages call control and signaling
Media layer, which is responsible for transport, switching, and mediation.
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3FZ08058AAAA Edition 01
Figure 2 illustrates the role of the Alcatel 7515 Media Gateway in NGNs. In the NGN architecture, the Alcatel 7515 Media Gateway is located in the media layer, providing inter-working of different bearer traffic. In the signaling and call control layer, the softswitch performs signaling, interworking between VoIP protocols and Public Switched Telephone Network (PSTN) protocols. In response to softswitch instructions, the Alcatel 7515 Media Gateway allocates media processing resources, interconnects TDM DS0 (timeslots) to voice packet streams, processes media streams, and performs silence suppression and other signal processing functions.
0103_fig2_ed03
Service & Management Layer
Signaling & Control Layer
Media Layer
Application Servers and Operation Support Systems
Softswitch
Alcatel 7515 Media Gateway
Alcatel 7515 Media Gateway
IP Backbone PSTN PSTN
figure 2 Role of Alcatel 7515 Media Gateway within NGN
The Alcatel 7515 Media Gateway works in conjunction with a softswitch and internationally–proven standardized Signaling System No. 7 (SS7) network components to offer end–to–end NGN solutions. Designed for deployment in small to medium tandem VoIP Points of Presence (PoPs), the Alcatel 7515 Media Gateway supports the Megaco/H.248 protocol, as well as the latest features in packet voice processing.
The Alcatel 7515 Media Gateway supports a Channelized T1 or Channelized E1 PSTN interface. 20 Alcatel 7515 Media Gateways in the American National Standards Institute (ANSI) configuration, or in the European Telecommunications Standards Institute (ETSI) configuration can be installed in a 2,20 meter (standard 7 foot) equipment rack. Details on the Alcatel 7515 Media Gateway capacity are shown in Table 2.
Table 2 Alcatel 7515 Media Gateway Capacity
PSTN Interfaces Maximum Capacity per Gateway
Ports using T1 interface (in American National Standards Institute (ANSI) configuration)
Up to 384 VoIP calls
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Ports using E1 interface (in ETSI European Telecommunications Standards Institute (ETSI) configuration)
Up to 480 VoIP calls
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3FZ08058AAAA Edition 01
1.2 Alcatel 7515 Media Gateway Key Benefits
Featuring a carrier–grade platform and a scalable architecture, the Alcatel 7515 Media Gateway is specifically designed to meet stringent operator requirements for Next Generation media gateway applications. Table 3 lists key features uniquely distinguishing the Alcatel 7515 Media Gateway in the media gateway market.
Table 3 Alcatel 7515 Media Gateway
Key Benefits Description
Multi-service(trunk/access/signaling) Gateway
The Alcatel 7515 Media Gateway can act as multi-service gateway which includes Trunking GW, Access GW and signaling GW service with same software.
Operational cost savings resulting from compact size and low power consumption
Up to 20 ANSI or ETSI configured Alcatel 7515 Media Gateways can be fit into a 2,20 meter (standard 7 foot) Telco rack, saving valuable Central Office (CO) space.
Advanced platform architecture, built to excel in carrier environment
High performance and reliability-VxWorks OS provides carrier proven, reliable, flexible methods of delivering multiple service
Support for both ANSI and ETSI configurations
The Alcatel 7515 Media Gateway can be provided with an E1 interface to interoperate with ETSI configurations, or with a T1 interface to interoperate with ANSI configurations. The Alcatel 7515 Media Gateway supports both electrical and optical interfaces.
Latest Generation DSP technology providing superior Voice Quality
The Alcatel 7515 Media Gateway includes a pool of high–density DSP–based modules offering G.711, G.726, G.729a/b, and G723.1 Voice Codecs, as well as G.168 compliant echo cancellation with 128 ms tail length. The DSPs port or interface for voice compression and packetization, silence suppression, echo cancellation, and other packet voice processing facilities.
Industry Leading Management Solution The Alcatel 7515 MG EM offers Simple Network Management Protocol(SNMP) controlled Graphical User Interface(GUI) management, supporting configuration, fault, performance, and security management
Open Standard Protocols Supports the industry-standard Megaco v1.0 signaling protocol to seamlessly inter-work with softswitch., e.g. Alcatel 5020 softswitch
Extensive Compatibility with the Alcatel 7515 Media Gateway
Smooth evolution toward later Alcatel Media Gateway models is ensured.
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1.3 Alcatel 7515 Media Gateway Features The Alcatel 7515 Media Gateway is based on a compact size chassis configuration that delivers a comprehensive feature set to support VoIP trunking applications.
To access the PSTN network, the Alcatel 7515 Media Gateway supports a channelized T1 interface for the ANSI configuration and a channelized E1 interface for the ETSI Primary Rate Interface (PRI) configuration. The Alcatel 7515 Media Gateway supports up to two (plus two redundant) Ethernet ports to access the packet network.
Routing functions in the Alcatel 7515 Media Gateway include Open Shortest Path First (OSPF) and Routing Information Protocol (RIP). The Alcatel 7515 Media Gateway is equipped with Fault Tolerant Application Management (FTAM) software and optional redundant hardware to ensure high–availability operation. An extensive Command Line Interface (CLI) is provided to allow configuration control and management.
1.3.1 General Features Table 4 summarizes the Alcatel 7515 Media Gateway general features
Table 4 Alcatel 7515 Media Gateway General Features
Features Description
Dimensions & Weight Height: 8.8 cm (3.48 inch)
Width: 48.1 cm (19.0 inch)
Depth: 46 cm (18.1 inch)
Weight (shelf only): 7.5 kg (16.5 lbs.)
Weight (fully configured): 12 kg (26.4 lbs)
Number of slots 2
Supported Racks Up to twenty Alcatel 7515 Media Gateways can be installed in one of these racks:
-- 7 feet x 19 inch Network Equipment Building Standard (NEBS) compliant rack
-- 7 feet x 23 inch NEBS compliant rack (included with gateway unit)
-- 2200 mm x 600 mm ETSI rack
Power –48 V Direct Current (DC)
redundant A+B power feeds
Maximum 300 W
PSTN Interfaces -- Up to 16 Channelized E1/T1 ports
Packet Interfaces Up to 2 Fast Ethernet ports with 1+1 redundancy
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OAM&P/Signaling–10/100 Mbit/s Ethernet
Management/Signaling Interfaces Up to 2 Fast Ethernet ports with 1+1 redundancy
IP Services IPv.4
OSPF v. 2.0
RIP v1.0, RIP v. 2.0
Telnet server
Signaling and Call Control Megaco v. 1.0/H.248, SIGTRAN IUA
Timing Internal Stratum 3
Any PSTN Input/Output (I/O) Interface
Building Integrated Timing Source (BITS)
Reliability & Redundancy 1+1 redundancy of System Control Module, General Purpose Forwarding Module, power, fan trays, and backplane
Quality of Service IP Type of Service (ToS)
OAM&P Element Management System with Event log, performance management fault monitoring and alarm generation
Command Line Interface (CLI)
Interoperability Softswitch, 3rd party vendors
Certifications See Appendix A
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1.3.2 Voice, Facsimile, and Public Switched Telephone Network Features
The following list summarizes the voice and facsimile features supported by the Alcatel 7515 Media Gateway.
Voice Features The following voice features apply:
G.711 Comfort Noise Generation (CNG) Voice Activity Detection (VAD) Configurable voice frame size u–law and a–law companding G.729a/b 8 kbit/s G.723.1 6.3 kbit/s Dynamic Codec Negotiation G.168 compliant echo cancellation (up to 128 ms tail length) Adaptive Jitter Buffer, configurable, with an upper limit of 200 ms
Fax Features The following facsimile features apply:
Automatic fax detection FAX PCM pass-through (G.711).
T.38 FoIP – Real-time fax protocol.
PSTN Features The following PSTN features apply:
SS7 continuity test(COT) DTMF Transport
Out-of-band (RFC 2833) In-band (G.711 pass through)
TDM-Switching(TDM Hair-pinning)
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1.3.3 Density and Scalability The Alcatel 7515 Media Gateway chassis supports 2 slots and can be configured with three types of application–specific modules:
The Front Service Module (FSM) performs all management and routing functions.
The Rear Transition Module (RTM) includes 8 PSTN interface for ETSI and ANSI and 2 Fast Ethernet interface.
The Voice Process Module (VPM) Module contains DSPs designed to process TDM and packet voice traffic..
The number of Universal Modem Server modules determines the port capacity of the Alcatel 7515 Media Gateway. Table 5 shows some example configurations.
Table 5 Alcatel 7515 Media Gateway Example Configurations
Number of Universal Modem Server modules
Capacity per Gateway
Rack Capacity
(20 Shelves/Rack)
2 (maximum for ETSI configuration)
480 DS0s 9600 DS0s
2 (maximum for ANSI configuration)
384 DS0s 7680 DS0s
’Shelf’ means one gateway viewed as one shelf in a rack. Table 5
assumes that in the ANSI/ETSI configuration there can be as many as twenty shelves/rack.
1.3.4 Performance Table 6 lists Alcatel 7515 Media Gateway performance characteristics.
Table 6 Alcatel 7515 Media Gateway Performance
Performance Area Values per Shelf
Values per Rack
(20 Shelves/Rack)
Voice call hold time 3 minutes -
Calls per second (ANSI) 2.1 42
Calls per second (ETSI) 2.7 54
Maximum Busy Hour Call Attempts (BHCA) for ANSI configuration
7,680 153,600
Maximum BHCA for ETSI configuration
9,600 192,000
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1.4 Management The Alcatel 7515 Media Gateway incorporates a complete set of system and network management tools, including an extensive CLI, local and remote Telnet, SYSLOG Services, and diagnostics for troubleshooting, as well as a Trivial File Transfer Protocol (TFTP) to realize file transfer.
1.5 Applications As a VoIP media gateway, the Alcatel 7515 Media Gateway is primarily responsible for performing media mapping or bearer conversion functions. The media gateway functionality includes circuit termination, packet handling, edge routing, and media processing.
Incoming circuit–switched bearer traffic is packetized to be transmitted over IP networks, and packet–based traffic is reformatted to Pulse Code Modulation (PCM) and switched to the TDM interface connected to a PSTN.
The following sections describe the role of the Alcatel 7515 Media Gateway in a trunk toll bypass application, and as a VoIP gateway for broadband access.
1.5.1 Emerging Service Providers: Trunk Toll Bypass Application
The trunk toll bypass solution targets the international long distance voice calling market.
The Alcatel 7515 Media Gateway is an ideal product for distributed VoIP trunking deployments in small to medium VoIP PoPs. It is an ideal solution for emerging service providers offering retail or wholesale voice over IP services cost–effectively.
Retail service providers sell time on an IP network to individual consumers or to small businesses on a retail basis. IP telephony wholesalers sell large blocks of long distance time between locations to Internet Telephony Service Provider (ITSP) and traditional carriers requiring large bandwidth. International service providers can bypass high international tariff rates, based on international accounting rates, to and from non–liberalized markets. The trunk toll bypass solution allows these service providers to offer cheap long–distance voice services over IP.
Mass adoption of VoIP in a trunk toll bypass application is expected to grow as major carriers begin to offer cost–effective and easy–to–implement solutions. The greatest hurdle toward attaining broad acceptance of VoIP in this segment has already been overcome by interfacing IP and PSTN networks with a high level of quality and reliability. Other attractive business developments are carrying VoIP over corporate Virtual Private Networks (VPNs), and the integration of phone, Private Branch Exchange (PBX), and fax machines.
The Alcatel 7515 Media Gateway benefits, as related to the trunk toll bypass application, are:
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Entry level cost and density for distributed deployment Modularity and DS1 level interface granularity Supports ETSI and ANSI features for global deployments.
In a trunk toll bypass application, a Local Exchange (LEX) carrier can be connected to an Alcatel 7515 Media Gateway by Intermachine Trunks (IMT). The softswitch interfaces with the SS7 network and controls the Alcatel 7515 Media Gateways using the Megaco v1.0 protocols, see Figure 3.
0112_fig3_ed03
IPIMT
Fax
Phone
IP IMT
Fax
Phone
LEX LEX IP backbone
Megaco/H.248ISUP/SS7ISUP/SS7
SoftSwitch
Alcatel 7515Media Gateway
Alcatel 7515Media Gateway
figure 3 Alcatel 7515 Media Gateway in a Toll Bypass Application
1.5.2 Competitive Access Providers: VoIP for Broadband Access The Alcatel 7515 Media Gateway helps service providers competing with incumbents by offering broadband network access using Digital Subscriber Line (DSL), Wireless Local Loop (WLL), or cable as alternative access technologies. The largest deployment is expected to be in emerging regions of the world, especially for Small Office Home Office (SOHO) and Small Medium Enterprise (SME) environments. Competitive access providers can capitalize on their investment in broadband network and access infrastructure by offering telephony services on top of data services.
Broadband access to residential and corporate users delivers advanced data services. Telephony is still the biggest revenue stream in most markets, and, as a ’narrowband’ service, it can be provided at minimal cost over an existing broadband data infrastructure using VoIP technology. Competitive access providers can offer superior VoIP services at more attractive tariff rates to residential customers who already have lifeline telephony service provided by incumbent service providers.
In addition to delivering data services, access providers can offer derived services over the broadband data infrastructure. With an IP–based broadband network, service providers can offer traditional telephony services in combination with multi–media
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services and inter-working services. IP–based voice and data networks also open opportunities to provide enhanced services such as video conferencing, as well as e–business applications (for example, web–augmented contact centers).
The Alcatel 7515 Media Gateway benefits for VoIP for the broadband access application are:
Superior scalability with up to DS3 level capacity
Interoperability with softswitches, IP phones, and Integrated Access Devices (IADs).
The Alcatel 7515 Media Gateway supports standard protocols, and interworks with softswitches and IP terminals to offer advanced VoIP services to broadband subscribers. Calls that originate from a broadband subscriber or an H.323 terminal can be terminated, using the Alcatel 7515 Media Gateway, on the PSTN, see Figure 4.
0113_fig4_ed03
IP IMT IP
SS7
IP backbone
Megaco/H.248
H 323
ISUP/SS7
SoftSwitch
PSTN
Fax
IAD
PhoneAlcatel 7515
Media Gateway
figure 4 Alcatel 7515 Media Gateway Supporting VoIP Broadband Applications
When a broadband subscriber dials a remote PSTN user, the IAD identifies the dialed digits and forwards them to the softswitch. Using the Megaco protocol, the softswitch identifies the IP address of the Alcatel 7515 Media Gateway based on the called number. The Alcatel 7515 Media Gateway receives the broadband call and passes it to the PSTN.
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2 Architecture and Hardware
This chapter provides information concerning the Alcatel 7515 Media Gateway architecture and hardware. The following sections are presented:
Introduction Architecture System Components Power Supplies Clock Cards Alarm Cards Fan Trays Alcatel 7515 Media Gateway Modules Alcatel 7515 Media Gateway Configurations High Availability Diagnostics.
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2.1 Introduction The Alcatel 7515 Media Gateway is a low-density media gateway which deliver high availability and carrier grade quality transmission with redundant service processing modules, power supplies, fans, external synchronous clocks and packet interfaces. The Alcatel 7515 Media Gateway can offer the flexible interfaces to the STDM/packet networks, and the independence of the key modules facilitates the upgrade of the Alcatel 7515 Media Gateway to protect the customer’s investment.
2.2 Architecture The Alcatel 7515 Media Gateway embraces a modular architecture, which uses an open, programmable call control model. Call processing is independent of other functions, such as resource management, routing, or forwarding.
MainBoard
RTM
VPM(PM-UMS-xxx) PPM
CPM
SCM
Figure 5 A7515 Non-Redundancy System Architecture Overview
The Alcatel 7515 integrates the basic common modules such as the circuit processing module, packet processing module and system control module into a single main-board, but separates the key modules - the voice processing module and rear transition module – from the main-board to facilitate the upgrade, shown as figure 5.
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2.2.1 Software Modules
Figure 6 shows the software modules in the Alcatel 7515 Media Gateway.
Data Management
Platform Core
HdS
GFI
Inte Soc
APS
TTY Driver Flash File
Kernel
Albrecht Schwarz (15-Dec-2001)
Driver
File System
Diagnostics User Interface
Telnet
TFTP SNMP
Physical DeviceManager
Configuration Data Base Manager
Redundancy Manager
Multicast Manager
SIGTRAN xUA Protocols
TDM Manager
Voice Port Manager
Resource Manager
Gateway Control Protocols (GCP):
... H.248/MEGACOP
Fault Tolerant Application Manager
SCTPTCPUDP
IP Management Interface
RIP OSPF
IP Routing protocols & RIB
Port IF (PIF)
Logical Port IF (LPI)
Protocol Demux
High Speed
IP Forwarder
IP ForwarderMARP Function
ARP Function
IP ForwardingTable
IP CacheTable
ARP Table
Platform Applications (OAM&P) Signaling GatewayApplications
Communication
Generic Forwarding Interface (GFI)
Driver
“Local Access”
Connection Handler & Resource Management
Media Gateway Applications
Figure 6 Software Modules in an Alcatel 7515 Media Gateway
Table 7 describes the functionality of the Alcatel 7515 Media Gateway’s primary software components.
Table 7 Software Module Functions
Alcatel 7515 Media Gateway Software
Function
Gateway Control Application The Gateway Control Application enables call processing and seamless interworking with the softswitch using either the Megaco or MGCP protocol.
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TDM Manager The TDM manager is responsible for the setup and teardown of TDM connections (DS0 paths – 64 kbit/s). It also arranges the allocation of DSP resources for the requested channels.
Resource Manager and Voice Channel Control
The Resource Manager and Voice Channel Control software allocates and releases DSP resources for voice channels. Resource managers stored in each DSP module track the status and availability of all DSPs. When a dedicated line is configured, or when a switched call comes in, a request is broadcast to each of the DSP modules. Resource managers throughout the system receive the request and determine the resources that are needed to set up a TDM circuit from the input port to the pooled DSP resources.
Voice Port The Voice Port software configures and manages DSP resources that have already been allocated by the resource manager.
Fault Tolerant Application Management Software
The FTAM monitors the Alcatel 7515 Media Gateway software components to ensure non–stop operation. The FTAM controls system start–up, sense hardware status, and measure internal temperatures.
Configuration Database Manager (CDBM)
The CDBM collects, distributes, and stores configuration information for the entire chassis.
Routing Server/Packet Forwarding
The routing and packet forwarding server forwards IP packets based on module cache memory and forwarding tables.
2.2.2 Central Forwarding The Alcatel 7515 Media Gateway uses a high performance forwarding engine to do the packet forwarding, this can lighten the processing pressure of the voice processing module. Meanwhile, the high performance forwarding engine minimums the packet delay in the media gateway.
IP forwarding uses the forwarding table, which maintains same information as master routing table, and ARP table to make forwarding decisions. At the same time, IP caching will be used based on source, destination pairs for higher performance. All management packets addressed to system itself (TCP/UDP/OSPF packets etc.) will be handled over to “IP Local Stack” subsystem.
The forwarding table will keep synchronization with master routing table. Any change of the master routing table will be updated to forwarding table after a fixed interval.
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IPInterface
M asterRouting
Table
Note: the Forwarding Table maintains the same information as the master routing table
ARP Table
IP Cache
Ethernet
Figure 7 Central IP Forwarding
2.2.3 Voice Processing The Voice Processing Module is an independent daughter board Mounted on the main-board to facilitate the upgrade of the A7515. The Alcatel 7515 Media Gateway is constructed according to an efficient, modular, pooled DSP resource design. The DSPs offer G.711 G.729a and G723.1 Codecs to any interface to perform voice compression, packetization, silence suppression, echo cancellation, and other packet voice–processing services.
2.3 System Components The Alcatel 7515 Media Gateway system modules/components are as followings:
2–slot shelves with a back-plane
Fan tray (side–mounted with side venting)
Main-board (also Named Front Service-Processing Board)
Circuit Processing Module
Voice Processing Module (Refer to Section 2.2.3)
Packet Processing Module
System Control Module
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Clock module
Alarm module
Rear Transition Module
See Figure 8 which shows the front and rear views of the Alcatel 7515 Media Gateway.
The manboards are inserted from the front of the unit, and the RTMs are inserted from the rear of the unit, and the fan trayss are inserted from the rear or front of the unit. All cables are available from the rear of the Alcatel 7515 Media Gateway
Viewed from the front or rear, the Alcatel 7515 Media Gateway has -two horizontal slots. The gateway is rack–mountable in the following standard equipment racks:
19 inch 23 inch 600 mm.
As many as 20 Alcatel 7515 Media Gateway units (in an ETSI/ANSI configuration) can be installed in a single 2,20 meter (standard 7 foot) equipment rack.
Figure 8 Alcatel 7515 Media Gateway Rear View
Figure 9 Alcatel 7515 Media Gateway Front View
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2.4 Mainboard Modules
The Alcatel 7515 media gateway main-board is also named FM-SPM-C5 Board. The main-board comprises several modules:
System Control Module
Circuit Processing Module
Packet Processing Module
Alarm Module
Clock Module
2.4.1 System Control Module (SCM) The System Control Module performs configuration services and route calculation for the Alcatel 7515 Media Gateway. It is a special module containing additional memory, flash Programmable Read Only Memory (PROM), and boot PROMs. While all Alcatel 7515 Media Gateway modules forward packets, the System Control Module additionally runs Megaco or MGCP signaling protocols and provides a primary point of control for network management; it maintains a master copy of all operating software that is downloaded to other modules as well.
When the Alcatel 7515 Media Gateway is configured into 1+1 redundancy, two System Control Modules exist in a system: one is active, and the other remains in the hot standby mode to automatically assume all primary System Control Module functions if the active module should fail. Primary and secondary System Control Modules are configured during system power–up.
Table 8 contains System Control Module more details.
Table 8 System Control Module Details
System Control Module Description
Performance 2 Dhrystone MIPS/MHz
128-Gbps on-chip bus bandwidth, 26-Gbps memory bandwidth, up to 29-Gbps total I/O bandwidth
CPU Type MIPS64
600~1000 MHz
2.4.2 Circuit Processing Module The circuit processing module comprises one sub-modules: one is T1/E1 module. The T1/E1 sub-module provides the T1/E1 PSTN interface function for an Alcatel 7515 Media Gateway in the ANSI/ETSI configuration. This sub-module implements complete support for up to 16 T1/E1 interfaces.
Table 9 lists the main-board characteristics equipped with the T1/E1 interface.
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Table 9 Main-board with T1/E1 Interface
WAN Line Interface Module Description
Part Number FSB–IP/ATM–8/16E1
Performance 8/16 T1/E1s, each at 1.544/2.048 Mbit/s (8 x 24/30 =192/240 DS0s or 16 x 24/30 =384/480 DS0s)
Interfaces per module 8/16 E1s, using RJ45 Connectors
Hot–Swappable Yes
Operating Temperature 0 ºC to 40 ºC
Operating Humidity 0 – 80 % (non–condensing)
CPU Type MIPS64
600~1000 MHz
Framing Support E1: Double- & CRC Multi-frame
T1: F4, D4, ESF, SLC96
Line Encoding Support E1: HDB3
AMI/T1: B8ZS
AMI with ZCS
Standards Compliance G.703
G.704
G.705
G.706
G.732
G.735
G.736
G.737
Several key T1/E1 Interface module parameters can be configured using CLI commands to further define the characteristics of an T1/E1 interface. The following options are supported in the Alcatel 7515 Media Gateway:
Framing Type: ITU–T G.704 Framed Mode
Line Code: HDB3
Integrated Channel Select Unit (CSU), configurable for short– or long–haul external CSU support from 0 to 199 meters (0 to 655 feet).
24–hour statistics/status history buffer selectable for viewing in 15–minute timeframes (framing errors, Cyclic Redundancy Check (CRC) errors, line coding violations, pulse density violations, etc.).
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2.4.3 Packet Processing Module
Packet Processing Module consists of two sub-modules: Packet Interface Module (PIM) and Packet Switch Fabric (PSF). Packet Interface Module provides line/trunk interfaces for packet-switched networks, protocol processing functions for the used packet bearer and meta-bearer protocols, and packet forwarding. The types of packet ports are 1+1 Fast Ethernet (electric), or 1 Gigabit Ethernet (electric), or 1+1 Gigabit Ethernet (Optics). All external interface connectors are implemented in the RTM. The PIM provides as well local packet switching capability for data path packets. PSF Provides packet internal switching functionality, and cascaded interfaces and network manage interface are implemented in this sub-module. Table 10 lists the PPM characteristics
Table 10 Packet Processing Module characteristics
Item Description
Main board Part Number FSB––IP/ATM––xxx
RTM Part Number RTM-FE
RTM-eGE
RTM-oGE
RTM-ATM(future)
Performance Over 4,500 MIPS
40M PPS (standard IPv4 L3 look-up/switching)
Interface Type 1+1 Fast Ethernet (electric)
1 Gigabit Ethernet (electric)
1+1 Gigabit Ethernet (Optics)
Hot–Swappable Yes
Operating Temperature 0 ºC to 40 ºC
Operating Humidity 0 – 80 % (non–condensing)
CPU Type NPU
266MHz
Standards Compliance IEEE 802.3
2.4.4 Alarm Module
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2.4.5 Clock Module In the Alcatel 7515 Media Gateway, the clock module is integrated into the main boards, and it is a centralized duplicated clock generation and distribution system. The clock module contains internal clocks, alarm relay contacts, and an administrator terminal access. The clock module includes an 8 kHz clock to accomplish local line–timing configuration. The clock module in the master main board work on master mode, and the one in the slave main board works on slave mode.
2.4.6 Power Supplies A single Alcatel 7515 Media Gateway is a self-contained cabinet, and the mainboards, the rear boards, and the fan-trays have their own power supply and distribution, their source being the globally distributed -48V DC Central Office power supply. Hence, own power supply and own converter for each board and RTM, i.e., no power dependency between the main-boards and/or the RTM boards except the voice processing daughter board is depending on the main-board. Two -48V DC power supplies are connected to a Alcatel 7515 Media Gateway for the redundancy: if one power supply fails during operation, the boards will automatic switch to power supply.
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2.5 Rear Transition Module
All external interface connectors are implemented in the rear transition module. These interfaces include: 8 T1/E1 connectors each RTM, and two RTMs are required if 16 T1/E1 is
configured
1 10/100Mbit Ethernet connector each RTM for WAN data link
1 SSU/BITS connector each RTM
1 10/100Mbit Ethernet connector each RTM for network management
1 RJ-45 connector each RTM for craft (RS232)
1 RJ-45 connector each RTM for alarm
RTM only directs the external link to the main board through back plane.
2.6 Fan Trays Hot swappable fan trays are used to cool the Alcatel 7515 Media Gateway shelves. If an individual fan fails, an alarm is sent to the network management software.There are two types of fan trays: one is inserted from the front with three fans, and the other is inserted from the rear with one fans. In a fully loaded system, two front fan trays and one rear fan trays are required. Exhaust airflow is directed from the left to the right of the shelf from the front view
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2.7 Voice/Fax Processing Modules
voice/fax processing modules consist of the industry–leading DSP chipsets ,which provide a complete solution for transporting multiple media types between circuit-switched and packet-based networks. These DSPs are ideally suited for the converging voice and data network infrastructure. For the A7515 product, the modules address requirements such as Voice and Fax over packet, while maintaining support for traditional PSTN Data/Fax applications. The PM-VPM-240/480 modules serve up to 240/480 connections simultaneously.
Table 12 lists PM-VPM-480 details.
Table 12 PM-VPM-480 Module Details
Universal Server Module Description
Part Number PM-VPM-480
Performance 480 G.711 Channels (at 64 kbit/s)
200 G.729a/b Channels (at 8 kbit/s)
160 G.723.1 Channels (at 6.3 kbit/s)
120 FoIP Channels
Interface to motherboard PT2MC
Operating Temperature 0 ºC to 40 ºC
Operating Humidity 0 – 80 % (non–condensing)
Power Dissipation [email protected]
Clock Frequencies 33 MHz PCI Bus
50 MHz for RMII bus
8.192MHZ for CT bus
Standards Compliance G.711
G.729a/b
G.723.1
T.38
Voice/Fax Processing Module Features
The voice/fax processing module is based on industry–leading DSP technology, offering advanced VoIP and FoIP processing capabilities. A multi-service access chipset is implemented in this module. This chipset supports flash upgrades of new feature implementations and enhancements without requiring hardware changes.
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Voice Features
The following voice features are supported in Voice/fax Processing modules:
G.711 without silence suppression
G.711 with silence suppression: Voice Activity Detection (VAD), and Comfort Noise Generation (CNG)
Configurable voice packet frame size
Configurable Jitter Buffer , up to 200ms
G.711 u–law and a–law encoding
G.729a, 8 kbit/s VAD, CNG
G.729b
G.723.1, 6.3 kbit/s
Dynamic Codec switch
G.168 echo cancellation with up to 128 ms tail length.
Fax Features The following facsimile features are supported in Voice/fax Processing modules:
Automatic Fax detection
Automatic voice/fax/data/ codec switchover
Automatic echo cancellation and silence suppression turned off for fax calls
G.711 transparent pass through
FAX relay.
T38 Real-time Fax over IP
2.8 Alcatel 7515 Media Gateway Configurations Each front slot in the Alcatel 7515 Media Gateway accommodates a mainboard that provides protocol processing, packet forwarding, system control and management, and server functionality. Each rear slot accommodates a RTM board that provides various combinations of line interfaces. The voice processing daughter board mounted on the front mainboard is responsible for processing voice packets bridging PSTN network and packet network, refer to figure 2-1.
Table 13 summarizes the VoIP functionality processed by each of the Alcatel 7515 Media Gateway modules.
Table 13 VoIP Functions Processed by the Modules
VoIP Functionality System Control
Packet Processing
Circuit Processing
Voice Processing
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Module Module Module Module
Overall System Initialization and Management
X
Call Control and Connection Management
X
Routing and Forwarding
X X
Packet Handling X
TDM Hairpinning x
PSTN Interface x
Packet Interface X
Voice Processing, Coding, and Packetization
x
Silence Suppression, Comfort Noise Generation, and Echo–Cancellation
x
Management Interface
X
If no redundancy is required, one mainboard with one voice processing module, and one RTM(8 T1/E1s) or two RTMs (16 T1/E1s) is equipped in a Alcatel 7515 media gateway. If the redundancy is required, two mainboards with one voice processing module each, and one RTM(8 T1/E1s) or two RTMs (16 T1/E1s) is equipped.
Table 14 shows the board configuration for each case.
Table 14 The board configuration
Non-Redundancy Redundancy
Board 8 T1/E1 16 T1/E1 8 T1/E1 16 T1/E1
FSB Mainboard 1 1 2 2
VPM daughter Board
1 1 2 2
RTM 1 2 2 2
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ETSI The ETSI configuration characteristics are:
Eight/Sixteen E1 trunks, connected to the PSTN
Ethernet Ports: 1+1 10/100 Base-T, fully protected, connected to the IP Network
240/480 VoIP Ports
4800/9600 Busy Hour Calls.
ANSI The ANSI configuration characteristics are:
Eight/Sixteen T1 trunks, connected to the PSTN
Ethernet Ports: 1+1 10/100 Base-T, fully protected, connected to the IP Network
192/384 VoIP Ports for T1
3840/7680 Busy Hour Calls For T1.
2.9 High Availability The Alcatel 7515 Media Gateway offers exceptional availability to address the stringent requirements for Central Office deployments. High–availability begins with redundant system buses and extensive redundant hardware. Every essential hardware and software component can be backed–up by at least one redundant copy. Hardware components are hot–swappable, including mainboard, fans, and power supplies. The internal FTAM software detects internal and external outages, and restores service automatically when possible.
2.10 Diagnostics The following list contains diagnostic features supported by the Alcatel 7515 Media Gateway.
SYSLOG on remote host (UNIX and Windows platforms) Support for eight SYSLOG message levels Secondary/backup log–server support Call trace features Startup diagnostics tests On–demand diagnostic tests.
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