Market Scenario & BSNL status · •OCB-283 Supplied by M/s Alcatel, France •5ESS Supplied by M/s...

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E5-E6 TELECOM

CFA Technology Overview-I

WELCOME

• This is a presentation for the E5-E6 Telecom Module

for the Topic: CFA Technology Overview-I

• Eligibility: Those who have got the upgradation from

E5 to E6.

• This presentation is last updated on 21-3-2011.

• You can also visit the digital library of BSNL to see this

topic.

© For internal circulation of BSNL only

© For internal circulation of BSNL only

Public Switched Telephone Network (PSTN).

AGENDA

Next Generation Network (NGN)

Standalone Signal Transfer Point (SSTP)


Public Switched Telephone Network (PSTN)

The telephone network used for fixed line services

consist of the telephone exchanges or elements

(switching systems) in PSTN which work on “Circuit

Switching” principle while the data networks, on the

other hand use the principle of “Packet Switching”.

PSTN ElementsThe telephone network is consists of various PSTN

elements like local exchanges, transient exchanges,

local cum transient exchanges, NGN /IP TAX and

standalone signaling transfer point (SSTP).


• EWSD Supplied by M/s Siemens, Germany

• OCB-283 Supplied by M/s Alcatel, France

• 5ESS Supplied by M/s Lucent, USA

• AXE-10 Supplied by M/s Ericson

New Technology (NT) switching systems:


The total equipped capacity in BSNL as on 30thSept

2010 is about 6,21,98,000 (including WLL and DLC).

In the BSNL network about 30% of the total switching

capacity is on CDOT technology.


In the BSNL network about 38% of the total working

connection is on CDOT technology. The total

working connection in BSNL as on 30th Sept 2010 is

about 3,10,36,276.

The WLL FWT (Fixed wireless terminals and the

connection given over DLC are counted in Basic

service (Fixed Network).



Network Organization

•The PSTN network is organized in a hierarchical

manner with Lev-1/ Lev-2/ Tandem/ Local

Exchanges.

•The calls from a local exchange are routed to Lev-I

TAX either directly or through Lev-II TAX.

• From Lev-I TAX it is routed to the destination

exchange either directly or through another Lev-

I/Lev-II TAX.

•For ISD calls ISD Gateway is used



Existing network node:-

•Lev-I TAX -------In 21 places

•Lev-II TAX -------In 301 Places

•International gateways at 6 places (Delhi, Chennai,

Mumbai, Kolkata Jallundhar and Ernakulam ).

•Local Exchanges: About 36,000

New Network (Upgradation) node:-

NGN/ IPTAX ------- All the sites of Lev-I TAX .

SSTP ------- 24 locations



Why NGN?

The PSTN network is mainly optimized for voice calls and not

much suited for data services. We have a separate network for

data services.

Today the world over trend is for a single converged network

used for all type of services viz. voice, data, video which is

called Next Generation Network and is a based on packet

switching principle.

It supports generalized mobility which will allow consistent and

ubiquitous provision of services to users. < ITU-T

Recommendation Y.2001 (12/2004) - General overview of

NGN>.



The NGN concept takes into consideration new realities in the

telecom industry characterized by factors such as the need to

converge and optimize the operating networks and the

extraordinary expansion of digital traffic (i.e., increasing

demand for new multimedia services, increasing demand for

mobility, etc.).

ETSI defines the NGN as a concept for defining and

deploying networks, which due to their formal separation into

different layers and planes and use of open interfaces, offers

service providers and operators a platform, which can evolve in

a step-by-step manner to create, deploy and manage

innovative services.



Generic diagram to depicts the concept of NGN

Interfaces

Switching

Call

Control

Call

Server

IP/MPLS

Gateways

SDH Transport

with Overlay

packets for data

Common IP MPLS

Transport over SDH/

DWDM/Fiber


• Packet-based transfer

• Separation of control functions among bearer capabilities,

call/session, and application/service

• De-coupling of service provision from transport, and provision

of open interfaces

• Support for a wide range of services, applications and

mechanisms based on service building blocks (including real

time/streaming/non-real time services and multi-media)

• Broadband capabilities with end-to-end QoS and transparency

• Interworking with legacy networks via open interfaces

• Generalized mobility

• Unfettered access by users to different service providers

Fundamental Aspects of NGN


• As the BSNL is having a huge PSTN network

consisting of local and TAX exchanges, therefore we

have to gradually migrate towards NGN

.

• Initially BSNL has planned to implement NGN at the

TAX level and subsequently will be implemented at

the local exchange level.

Strategy For Migration Towards NGN


Generic Reference Diagram For IP TAX


Soft Switch (or Call Agent or Call Server or Media

Gateway Controller) Functions:

• It is based upon open architecture

• Provide all existing services available in TDM network

• Performs media gateway Control function

• Performs call control, signalling and interworking,

traffic measurement and recording functions

• Provides addressing, analysis, routing and charging

• Interacts with application server to supply services not

hosted on soft switch

Soft Switch


Functions of Signalling Gateway (SGW)

• Provides interworking function between SS7 network

and IP network

• This involves providing various types of User

Adaptations so that the SS7 signalling can be

terminated in SGW and can be translated and

messages transported over IP Network

• Performs packetization of signalling and ensures its

transport through IP network

Signalling Gateway (SGW)


Functions of Trunk Media Gateway (TMG)

• Voice Encoding & Compression

• Packetization of Voice Channels

• CNF (Comfort Noise Generation)

• VAD (Voice Activity Detection)

• Echo Cancellation

Trunk Media Gateway (TMG)


One backbone for voice and data services instead

of two parallel ones.

No maintenance of proprietary switching systems.

Fewer call controlling entities in the network so

less capital and operating cost.

Less space and power requirement.

Easier configuration of equipment.

Advantages of IP TAX Deployment:


Objectives of SSTP

• Regulate, measure, and account for inter-network

traffic including SMS messages from mobile networks

including GSM and CDMA

• Achieve a flexibility and transparency in management

of signalling for BSNL’s wired and wireless networks.

• Optimal expansion of GSM & CDMA network of BSNL

• Introduction of new services.

• Offer CCS#7 & IP Signalling Services to other Wire

line & Wireless Network Operators.

Standalone Signal Transfer Point


SSTP’s at BSNL Network

• Pair of STPs designated as mated pair with identical

routing data and complete failover capability.

– Phase 1 - 10 Locations

– Phase 2 - 11 additional locations: This was later

changed to 24 locations to take care of the

connectivity issues.

– 4 Additional locations are Jammu, Shimla,

Dimapur, Shillong and dropping Raipur

– Phase 3 Expansion of all 24 nodes to about

capacity of 1800 LSL per node

Standalone Signal Transfer Point


Six STPs are designated as ANSI-ITU MTP gateway

(ILD Gateways).

Connect multiple SS7 nodes (MSC, Level-1 TAX, Level-2 TAX,

Local Exchanges, SMSC, HLR, SCP) to a mated pair using SS7

E1 links.

SSTPs interconnected using BSNL’s IP/MPLS network on M2PA

Later on M3UA functionality is also included to connect the

access nodes e.g. Soft switch, GMSC, IN, HLR etc.

Centralized Network Management with an active and DR

Standby site

Central Billing Server for billing inter-carrier SS7 usage

SSTP contd…..


Lawful Intercept (LI) of SMS

Mobile Number Portability (MNP)

Planned Applications on SSTP Network


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