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IP NETWORKPrepared by IP O&M Section

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TOPICS

• Introduction• IP Network Layers and their Functions• IP Network Equipments• Broadband Access Technologies

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INTRODUCTION

What is IPNGN?

Multi-Service NetworkSeparated PlanesOpen InterfacesA packet Mode TechnologyGuaranteed QoSSupports generalized mobility

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Why NGN?

Fusion of services Common networkIP in back boneSplit of different layers

INTRODUCTION Cont’d

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INTRODUCTION Cont’d

• Ethio telecom’s IP Network is constructed in such a way that it can provide NGN (including GSM, Fixed NGN, CDMA, IP/Broadband Access Network services including Value Added Services) at regional cities, major cities, sub cities, and towns.

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IP NETWORK LAYERS & THEIR FUNCTIONS

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IP NETWORK LAYERS & THEIR FUNCTIONS Cont’d

• Gateway layer/ deployed in 4 sites• Backbone layer/ deployed in 5 sites • Core layer/deployed in 17 sites• Edge layer/deployed in 25 sites, and• CS Layer/ deployed in 84 sites (75 cities)

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It contains Gateway Routers, Mainly functions to connect to an external network /internet/

GATEWAY LAYER

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Bahir Dar Gateway Site

OPGW upto Metema Internet

Dire Dawa Gateway Site

DWDM upto Dewele Internet

Shashemene Gateway Site

DWDM upto Moyale Internet

GATEWAY LAYER Cont’d

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The Ethio Telecom has built extensively Ethiopia’s internet infrastructure to give better and quality internet service.

Currently we have fifteen international internet links from Bole, Bahirdar Diredawa and Shashemene gateways

The Total Upstream /downstream bandwidth is 6475.5/6775.5 in Mbps

GATEWAY LAYER Cont’d

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GATEWAY LAYER Cont’d

Int’l Link Bandwidth(Down/Up in

Mbps)

Int’l Link Bandwidth(Down/Up in

Mbps)

SEACOM1 622/622 Canar Tel 1 622/622

SEACOM2 622/622 Canar Tel 2 622/622

SEACOM3 622/622 Sudatel 1 622/622

SEACOM4 622/622 Sudatel 2 622/622

SEACOM5 622/622

BCS 622/622

Djibouti 155/155

EMS sat 155/45

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Totally 10 sets of BR (T8000), distributed to five cities, Each city deploys two sets of BR, full-meshed connection, This layer is mainly responsible for service traffic forwarding and high capacity communication facilities.

BACKBONE LAYER

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Fully Meshed Horizontal Connectivity with vertical redundancy

Dire DawaAddis Ababa Shashemene MekeleBahir Dar

DD

BD MK

AA

SH

Link ProtectionEquipment Protection

BACKBONE LAYER Cont’d

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This layer is mainly responsible for service traffic forwarding, convergence and high capacity communication facilities.

CORE LAYER

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EDGE LAYER

Provides information exchange b/n the access and core network.

Provides It is an entry point in to carrier/service provider core backbone networks.

Used for aggregation of core switches.

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EDGE LAYER Cont’d

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Three IP/MPLS Layers - 10Gbps

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Access layer is where broadband access devices and ethio telecom’s other networks (GSM, CDMA, FL-NGN) are connected.

ACCESS LAYER

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Routers: ZTE T8000,M6000-8,T1200, GER, BRAS

Switches: ZTE T160G and T64G DSLAMs MSAGs

NETWORK EQUIPMENTS

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ZXR10 M6000-8 carrier class routerSwitching Capacity: 1.92 Tbps Weight: < 145 k g

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BROADBAND ACCESS TECHNOLOGIES

Broadband dial-up (PPPoE) and leased line (IPoE) services

ADSL2+ (up to 24Mbps) and VDSL2 (up to 250Mbps) services.

EPON – up to 1Gbps optical GPON – up to 2.5Gbps optical

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ADSL2+ PPPOE Network Link and Traffic Flow

IP-NGN Core

Internet

Customer

FL-NGN Access

MSAG ADSL2+

BRAS

AAA Server

Modem

TB

CC

Transmission

Copper

BRAS

ADSL PPPOE Traffic Flow Procedure Customer dials using the PPPOE protocol that includes

customer account and password information. BRAS accepts the customers’ dialup request, and then using

the radius protocol, Synchronize the account/password and speed information from the AAA server, Authenticate.

If the account and password is correct, BRAS will assign a dynamic address to the customer. Customers get the internet access services through the PPPOE protocol and BRAS controls the speed of customer internet access.

If the account and password isn’t correct, BRAS Refuse the customer’s internet access request and disconnection link.

BRAS

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ADSL2+ IPOE Network Link and Traffic Flow

IP-NGN Core

Internet

Customer

FL-NGN Access

MSAG ADSL2+

BRAS

Switch

TB

CC

Transmission

Copper

BRAS

ADSL2+ IPOE Traffic Flow Procedure Customer gateway is deployed on the

BRAS; Traffic goes to the BRAS then forwarded to

the internet through IP NGN Network. The speed of internet access limitation will

be configured on the BRAS.

BRAS

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Contacts of IP functional Maintenance Team

Name Telephone No.Behailu Sisay 0911217654Wondifraw Belachew 0911243521Tigist Nigus 0911502522Abebe Anjojo 0911500193Abayneh Bahiru 0911504977Aberra Gebre 0911503505

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THANKS!