12/23/2011Hardev Singh Manager (BB-NOC) MTNL
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Broadband TechnologyAn Overview Cont..
12/23/2011Hardev Singh Manager (BB-NOC) MTNL
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How Broadband Service Works?
3 Authenticationsystem checks account
&password BRASallocates valid IP
3 Authenticationsystem checks account
&password BRASallocates valid IP
BBRAS
RadiusServer
Lanswitch
Core
R
5 Billing serverstart accounting
5 Billing serverstart accounting
2 PPPoEsession ends
here andsession ID is
allocated
2 PPPoEsession ends
here andsession ID is
allocated
1 PPPoEis
initiatedby
subscriber
1 PPPoEis
initiatedby
subscriber
4 Subscribergets IP and
visit Internet
4 Subscribergets IP and
visit Internet
DHCP Server
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PC à CPEà DSLAM à T2à T1 à BRAS
Service flow begins from Client à BRAS which terminated PPPsessions.The process for user connection to internet is:
1. Client starts pppoe session by using pppoe software.2. ADSL modem translates IP packets into ATM cell.3. DSLAM recovers ATM cells to IP packets.4. DSLAM uses Q-in-Q protocol, which adds a new vlan tag to the
recovered IP packets. Each user has a respective vlan..5. T2 forwards IP packet to T1 & T1 transfers the IP packets to BRAS.6. BRAS also supports Q-in-Q protocol according to different outer vlan
and inner vlan to identify Different users.
BB Service Flow
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Ericsson Broadband Network
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Network Overview
IP DSLAM
Firewall
PEMServer
T2 Switch
BRAS
T1 Switch
AggregationSwitches
NOCSwitch
Internet
BillingServer
IP TVServer
MPLSNetwork
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DSLAM CardDefinition: Digital Subscriber Line Access Multiplexer
(DSLAM) is a network device, located in the telephoneexchanges of the service providers, that connectsmultiple customer Digital Subscriber Lines (DSLs) to ahigh-speed Internet backbone line using multiplexingtechniques.
Devices used in MTNL Network: EDN 312xp DSLAMcards are used in the network
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Important Features:
Ø Each card has capacity of connecting 12 subscriberssimultaneously
Ø It can be powered over Ethernet cables and both data andpower is conveyed in the same cable
Ø It terminates all end-user lines and is able to provide highspeed IP access to all end users simultaneously
Ø It can support eight PVCs for each end user
Ø It can support Line Qualification Test.
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ECN Card
Definition: It is an aggregationnode which provides layer 2Ethernet switching andsubsequently connects theend user to various IPservices through the accessnetwork.
Devices used in MTNL network:Ethernet Controller Node(ECN-320)
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Important Features:
Ø It manages and handles all functions of the embedded nodes(Acts as a proxy for PEM)
Ø It contains 10BASE-T/100BASE-TX RJ-45 ports and two comboports 10/100/1000BASE-T ports which operate incombination with Small Form Factor Pluggable (SFP)transceiver slots
Ø It has two power supply ports
Ø It provides comprehensive network management features
ECN Card
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ECN 320 Cascading
221 09-FA V 901 35/2 U en P A1 PD U M ulti Serv ice A cce ss1
ED A large-node – ‘design rules’
A
48-lines node8k M AC table
A
P
288-lines node8k M AC table
A
P
A
P
512-line s node8k M AC tab le
A
P
A
P
A
P
A
P
1152- lines node8k M AC table
R STP or L ink Aggregation?
O nly the 48 -line s node havethe op tion for e ither RSTP orLink A ggregatio n.A ll other nodes can only useR STP on up-link po rts (m orethan o ne E CN320 used)
R ED and G RE EN up-link?
In o rder to fully util ize theredundanc y (w hen da isy-cha in ing the E DN288 nodes)the up -link s m ust be tw oind ividua l paths (I.e . no loop s)
A and P in EC N320?
W hen configuring an E DN288node w ith red unda nt E CN320one ECN 320 m ust beconfigured as Active (A ) andthe o ther as P ass ive (P )
U n-used up-link ports ( )?
U n-used up-link ports m ustN O T be used a s it w ill c reatea slow and com plex spa nningtree (R STP ) structure
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T1/T2 SwitchesDefinition: They are LAN
switches used foraggregating and cross-connecting clients, serversand other network devices.
Devices used in MTNL: 3COM7700 LAN Switches
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LAN Switches
Important features of LAN Switch:
Ø Supports multiple service VLANs
Ø Aggregates links towards T1 switch or BRAS
Ø Supports multicasting
Ø Controls flow of Ethernet frames
Ø Ensures QoS for different types of traffic
Ø Allows management through CLI, Console,Telnet, SNMP and System log
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Broadband Remote Access Server(BRAS)
Definition: BRAS is a networkdevice used to route traffic toand from broadband remoteaccess devices such as DSLAMon an ISP network. It aggregatesusers sessions from accessnetwork and plays major rolepolicy management and QoS.
Devices used in MTNL: Juniper ERX1440
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BRASImportant Features:
Ø Aggregates the circuits from access devicessuch as DSLAMs
Ø Provides layer 2 connectivity through eithertransparent bridging or PPP sessions overEthernet
Ø Enforces quality of service (QoS) policies
Ø Provides layer 3 connectivity and routes IPtraffic through Internet service provider’sbackbone network to the Internet
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Firewall
Definition: It is a part of the network that isdesigned to block unauthorized access whilepermitting authorized communications. It isconfigured to permit or deny networktransmissions based upon a set of rules andother criteria.
Devices used in MTNL: Juniper Netscreen ISG2000
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Important Features:Ø ISG firewall can deliver security
features such as intrusionprevention system (IPS), Antispam,Web filtering, and Internet ContentAdaptation Protocol (ICAP) antivirusredirection support
Ø It allows deployment of securitypolicies that isolate guests and NOCservers or databases
Ø It provides fiber interfaces
Ø It supports multiple routingprotocols such as OSPF, BGP, RIP
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Management Server
Definition: This system isresponsible formanagement of DSLAccess systemsthrough Graphical UserInterface (GUI).
Server used in MTNL:PEM Server on SolarisPlatform
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Important Features:
Ø PEM uses HPoV NNM to provide a graphical network viewfrom which management of the network and subscribers canbe performed in the daily operation of the system.
Ø Service Configuration Manger application is used for handlingend-users and their services
Ø Subscriber line testing, service profile addition and deletionare done through SCM
Ø Network Configuration Manager application is used formanaging DSL Access network elements
Ø Bulk Configuration Manager is used for provisioning largernumber of end users
Ø Status Manager helps in monitoring network elements
Ø Back up Manager takes back up of entire PEM system
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NETWORK ELEMENTSNETWORKELEMENTS
Huawei ProductModel
TotalNumber ofElements
BRAS MA5200G-88
Tier-I NE80E8
Tier-II S650664
DSLAM MA5600 629
EMS Client iManagerN2000 30
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HARDWARE DESCRIPTION
The MA5200G provides the -48 V/-60 V DCpower input with 1+1 redundancy mode. Thepower supply has a primary straight-throughoutput and a secondary constant voltage -48V/-60 V DC output.
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Parameter namePerformance Parameters
MA5200G-8
Number of slots10 slots, 2 for SMUs and 8 for
SFUs.
Switching capability of
the backplane256G bit/s
Switching capability of
the whole equipment64G bit/s
BBRAS CHARACTERISTICS
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Parameter name Performance ParametersMA5200G-8
Number of configured
users
Up to 32K users per SFU, up to 256K
users per MA5200G
Number of concurrent
users
Up to 8K users per SFU, up to 48K users
per MA5200G.
Forwarding performance 3Mpps per board. & total 48Mpps
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Parameter namePerformance Parameters
MA5200G-8
Multicast protocol Andmulticast route
Multicast protocols: PIM-SM, PIM-DM,MBGP, MSDP and IGMP V1/V2.
Multicast routes: 10K.
VLAN4K per FE/GE port, 32K per board, up to
256K per MA5200G
Address pool4K address pools, 96K addresses.
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Parameter namePerformance Parameters
MA5200G-8
ACL 5K rules.
UCLThe equipment supports up to 1024
user groups, and each groupsupports up to 1024 rules.
CARThe range of CAR control is 8Kbps to1Gbps. The granularity is 8Kbps. The
error rate is less than 5%
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LCD display
Fan frame
Power frame
T1 Switches NE80E
2 PCS (active and standby)
LPU board: Up to16 PCS
Slot frames
SFU board:
4 PCS (3+1 backup)
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DEVICE HARDWAREDESCRIPTION
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Item Typical configuration
Processor Dominant frequency: 1GHz
Boot ROM 1 MB
SDRAM 1 GB Can be expanded to 2 GB.
NVRAM 512 KB
Compact Flash (CF) card512 MB
CHARACTERISTICS
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ITEM TYPICAL CONFIGURATION
Switching capacityInterface capacity
640 Gbps320 Gbps
Maximum interfacerate per LPU
2 * 10 Gbit/s
Slots for LPUs 16
Slots for SRUsSlots for SFUs
24
Forwardingperformance
400Mpps
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Component Description
DC input Rated voltage –48 VAllowed voltage –72 V to –38 V
AC input Rated voltage 200V AC to 240VAC, 50/60Hz
Allowed voltage 180V AC to264V AC, 50/60Hz
Environmentaltemperature
Long-term 0°C to 45°CShort-term –5°C to 55°CStorage –40°C to 70°C
PHYSICAL PARAMETERS
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T2 Switches Quidway S6506
S6506 is modularized wirespeed Ethernet
switch that operates atlayer two/three, at the
distribution layer of IPmetropolitan area
networks (MANs) and atthe core layer of
small or medium sizedenterprise networks
and campus area networks
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S6506 adopts integrated cabinetstructure.
The cabinet is wholly divided into fourparts:• Board areaThe board area includes totally 7 boardslots, One SRPU slot: Slot 0,6 serviceboard slots• Fan area• Power supply area• Power distribution area
HARDWARE DESCRIPTION
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FORWARDING CHARACTERISTICSConversion capacity 64Gbit/s
Packet switching rate 48Mpps
Max configuration of GE ports under the wirespeed mode
32
Max configuration of FE ports under the wirespeed mode
288
Number of VLANs 4K
MAC address table 32K
IP routing table 64K
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Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
Main
ControlB
oard
Main
ControlB
oard
Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
Lineboard
SP
L
SP
L
SP
L
SP
L
SP
L
SP
L
SP
L
SP
MF
SP
MF
SP
L
SP
L
SP
L
SP
L
SP
L
SP
L
SP
LSHELF STRUCTURE
MA5600 service shelf structure
MA5600 voice separate shelf structure
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MA5600 service shelf and voice splitter shelf, total 16slots, 14 slots are service slots, 2 slots are maincontrol slots
Service shelf:
Slots 7 and 8: system maincontrol board SCUSlots 0-6 and 9-15: serviceboard, ADEF (ADSL2+)
Voice splitter shelf:
Slots 7-8: main controlboard SPMFSlots 0-6 and 9-15: voicesplitter board SPLT/SPLQ
MA5600 HARDWAREDESCRIPTION
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APPLICATION OF THE MA5600
Configuration Maximum Numberof
Subscribers
Maximum PowerConsumption
DC-powered cabinet 896 1780 W
The MA5600 is a multi-service access module, which providesabundant access services, such as• Asymmetrical digital subscriber line 2 plus (ADSL2+)• Single-line high speed digital subscriber line (SHDSL)• Very high speed DSL 2 (VDSL2)
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