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ISSUE
Fixed Network Curriculum
Development Section
UA0001 SG7000 System Overview1.1
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Foreword
Trend of the communication network development
Concept of NGN
Location of SG7000 in NGN
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Lesson Goal
Know about the concept of NGN
Understand the function of SG7000
Master the principle of SG7000
After this lesson, you can:
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Lesson Contents
Chapter 1 NGN Overview
Chapter 2 SG7000 System Overview
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Chapter 1 NGN Overview
Section 1 Network development trend and
NGN overview
Section 2 Location of SG7000 in NGN
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Network Development Trend and NGN Overview
NGN, short form of the Next Generation Network, is a kind of service-drivennetwork.
Service and call control are completely separate, so are the call control and
bearer.
It is a brand new network integrated with voice, data, fax and video services.
The uniform of NGN can be integrated with communication, information, e-
commerce and entertainment services, bringing the interactive dream into a truth.
Telecom network, computer network and cable TV network are ultimately mergedinto a uniform IP network, that is the so-called voice/data/video 3-in-1 network.
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Trend of NGN
Open architecture with integrated multimedia services
Stepless network with simplified O&M and management
Fast deployment of new services to synchronize the market
change
3-in-1 network construction concept to concentrate investment
in a uniform network platform
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NGN Model
NGN model diagram
Soft Switch
switch
Soft Switch
switch
ATM SW ATM/IP GSR/TSR
SSN7
SG TMG AMG IAD MGW
Wireless
accessBroadband
accessPSTN/ISDN
Access
Transfer
Service application
OSS/BSS AAA server SCP App Server 3 rd Party Server Policy
Server
Control
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NGN Features
Layered fully-open network architecture, independent modular
structure
Completely separate service and call control, call control and
bearer
Uniform protocol based packet network system
IP network bearer
Separate gateway system
SG, AMG and TMG
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Interconnection between Existing Network and NGN
Interconnection of media flow (such voice, data and image)
Interconnection of signaling
1) Both NGN and existing networks must use the same
application layer signaling protocols (such as TUP and
ISUP).
3) Signaling messages can be transmitted seamlessly
between the two network types: Existing network and NGN.
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Chapter 1 NGN Overview
Section 1 Network development trend and NGN overview
Section 2 Location of SG7000 in NGN
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Location of SG7000 in NGN
Used in the access layer in NGN
With complete SIGTRAN and SS7 protocols
Connected to narrowband telecom equipment with traditional
narrowband network interface and standard No. 7 signaling
protocol
Connected to NGN equipment with packet network interface and
standard SIGTRAN protocol to implement the IP bearer of No. 7
signaling
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Location of SG7000 in Independent Gateway Model
SG7000 in separate gateway model
SS7
Circuit
SS7
Circuit
PS
T
N
PS
T
N
IP network
SG SG
MG MG
MGC MGC
SIGTRAN SIGTRAN
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SG7000 Functions
Narrowband
signaling bearer
TUP/ ISUP TUP/ ISUP
PSTN/PLMNPSTN/PLMN switch Soft switchSGSG
Narrowband
signaling
bearer
Broadband
signaling
bearer
Broadband
signaling
bearer
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Lesson Contents
Chapter1 NGN Overview
Chapter 2 SG7000 System Overview
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Chapter 2 Overview of the SG7000 System
Section 1 Features of the SG7000 Product
Section 2 SG7000 Networking Applications
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Flexible Configuration and Easy Networking
According to the actual network requirement of the
user, it can be used in fixed network or mobile
network, or in the case with integrated fixed andmobile network.
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Huge Capacity
Modules are smoothly expanded to increase
signaling links.
Supporting up to 5120 *64 kbit/s signaling links
Supporting up to 320 * 2 Mbit/s high-speed signaling
links
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High Reliability
The SG7000 is equipped with a highly reliable platform, withfully distributed architecture and modular software functions.
Redundancy technology is used in the system design, with
dual-backup or load-sharing for all key components.With extreme error tolerance capability, the fault with a single
software/hardware unit in the system will not affect the
signaling services of other units.
HA management function is implemented on the platform,
resulting in a system reliability above 0.99999.
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Comprehensive Functions
The SG7000 supports No. 7 signaling protocol, SIGTRAN protocol, TCP/IP
and Ethernet protocol, and implements the interconnection between No. 7
and IP.
The SG7000 can work as a signaling agent point or signaling transition
point, and supports signaling messages forwarded between narrowband
network and IP network or forwarded in narrowband network.
The SG7000 provides message screening, GT translation and multiple
signaling point functions.
The SG7000 supports 64 Kbit/s and Q.703 2 Mbit/s high-speed signaling
links (including the N*64 Kbit/s mode).
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Smooth Expansion
The hardware is designed in a structure of
superimposed modules.
By means of shelf cascading, it can be smoothly expandedup to 5120 links.
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Easy and Practical O&M
Providing multiple maintenance modes such as GUIand MML and supporting concurrent equipment
accesses from multiple local/remote clients
Comprehensive service statistics and realtime fault
management function
Integrated signaling tracing and message interpretation
function
Supporting uniform NM interface
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SG7000 Capacity Indices
The SG7000 capacity indices are listed in the table below:
Parameter IndexMax. links (64kbit/s) 5120
Max. links (2Mbit/s) 320
GT capacity 200,000
Max. destination signaling points 1,024Max. narrowband signaling link groups 512
Max. M3UA link groups 512
Max. narrowband signaling routes 2048
Max. M3UA signaling routes 512
Max ASs 1,024
Max. SCTP couplings 2,304
Max. SPMCs (SG works in the signaling
transition point mode)
1,024
Max. local signaling points supported 16
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SG7000 Performance Indices
Parameter Index
Max. load of 64kbit/s signaling link (20byte/MSU) 0.8Max. load of 64kbit/s signaling link (100byte/MSU) 0.95
Max. load of 2Mbit/s signaling link
(20byte/MSU)
0.4
Max. load of 2Mbit/s signaling link
(100byte/MSU)
0.8
GTT capability of 64kbit/s signaling link 80GTT/s
GTT capability of 2Mbit/s signaling link 1488GTT/s
Transition delay (between narrowband networks) 20ms
Transition delay (between narrowband network and broadband network) 40ms
Equipment availability 99.999%Unavailable time 5 minutes/year
MTP undetected error ratio 10-10
Message loss ratio at MTP fault 10-7
Message sequence reversal and repetition ratio at MTP fault 10-10
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Physical Interface Characteristics
Table of the physical interface characteristics
Interface type Access mode
Circuit interface 2.048Mbit/s , 64kbit/s
FE interface 10/100Mbit/s
Clock interface 2.048M bit/s , 2.048M Hz , 8 kbit/s
RS232 interface
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Chapter 2 SG7000 System Overview
Section 1 Features of the SG7000 Product
Section 2 SG7000 Networking Applications
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Service Applications
The SG7000 supports No. 7 signaling protocol, SIGTRAN
protocol, TCP/IP and Ethernet protocol, and implements the
interconnection between No. 7 and IP, resulting in the No. 7
signaling interconnection between narrowband network
equipment and NGN network equipment.
The SG7000 can work in the agent mode and signaling
transition point mode at the same time.
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Networking in Agent Mode
In the agent mode, the SG7000 uses the M3UA protocol.
When the M3UA protocol is used, the SG7000 and soft switch
use the
samesignaling point code.
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Networking in Agent Mode
Networking diagram in agent mode
LS
LS
STP
STP
SG
SoftX1
SoftX2
Point Code 1
Point Code 2
SS7
SS7
SS7
M2UA/M3UA
M2UA/M3UA
SG7000 networking in agent mode
Work as a part of softswitch.
Disadvantage: 1SG cant backup for Softswitch. 2we cant get the status
report between SG and Softswitch. 3SG just serve for one softswith, if we
want serve for other Softswitch ,we must use multi-SPC function.
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Networking in Signaling Transition Point Mode
The M2PA or M3UA protocol is used for the networking with
soft switch.
The SG7000 occupiesindependentsignaling point code.
Advantage:
SG is work as active and standby for Softswitch.
we can get the status between SG and Softswitch.
SG can serve for many softswitchs.
Most case we use this Mode !
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Networking Diagram
Networking diagram in signaling transition point mode
LS
STP
SS7
SS7
LS
SoftX1
SoftX2
SG2
SG1
Point Code 1
Point Code 2
Point Code 3
M2PA/M3UA
M2PA/M3UA
M2PA/M3UA
SG7000 networking in signaling
transition point mode
Independent with softswitch
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Summary
Basic concepts of NGN
Location of SG7000 in NGN
Features and networking applications of SG7000
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