broadband technology - welcome to mtnl executives' …meachq.in/html/mtnl_training.pdf · ·...

12/23/2011Hardev Singh Manager (BB-NOC) MTNL

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Broadband TechnologyAn Overview Cont..

http://www.pdfdesk.com


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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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IP DSLAM



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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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BRAS Functioning



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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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PEM Structure



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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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BBRAS MA5200G



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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


12/23/2011The DateHardev Singh Manager (BB-NOC) MTNL

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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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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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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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DSLAM MA5600



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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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[email protected]


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