ch8 e1-e2 cfa -sstp.ppt210.212.144.213/course_material/e1e2/cfa/e1-e2 ppt... · 2011. 4. 19. ·...

E1E1--E2 (CFA)E2 (CFA)

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SSTPSSTP

Signaling System No. 7 (SS7)

• SS7 is a layered protocol following the OSI reference model.

• The functions of the TCAP and ISUP layers correspond to the

Application Layer of the OSI reference model, and allow for

new services such as User-to-User signaling, Closed-User

Group, Calling Line Identification, various options on Call Group, Calling Line Identification, various options on Call

Forwarding, and of services based on a centralized database

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Network Elements

• Service Switching Points (SSPs)

• Service Control Points (SCPs)

• Signaling Transfer Points (STPs)

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• Signaling links are data transmission links that ordinarily operate on digital carrier facilities at 64,000 bits per second in most regions of the world.

• Signaling links between any two signaling network elements are • Signaling links between any two signaling network elements are deployed in groups called “link sets,”

• One combination of the link sets interconnecting an SSP or SCP with both members of the STP pair is called a “combined link set.”

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Service Switching Points (SSPs)

• Service Switching Points (SSPs) are telephone central

offices, also known as “End-Offices,” or “Access Tandems.”

• In the “wireless” communications environment, an SSP is

located at (MSC).

• SSPs perform circuit-switching functions• SSPs perform circuit-switching functions

signal other SSPs for call setup

query the centralized databases

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Service Control Points (SCPs)

• Service Control Points (SCPs) are network intelligence

centers where databases of call processing information are

stored.

• The function of SCPs is to respond to queries from SSPs,

by retrieving the requested information from the appropriate

database within the SCP node, and sending it back to the

originator of the request.

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SCP

• SCP contains

• Service Management Point (SMP)

• Service Logic Execution Environment (SLEE) & SEP

• Service Data Point (SDP)• Service Data Point (SDP)

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Service Management Point (SMP)

The SMP which is a computer system

• Is the front-end to the SCP

• provides the user interface.

• It is also referred to as the Service Management System

(SMS). (SMS).

• It updates the SCP with new data and programs (service

logic)

• Collects statistics from it.

• The SMP also enables the service subscriber to control

his own service parameters via a remote terminal

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Service Data Point (SDP)

• The SDF acts as a centralized database.

• The SDF is a special service that interacts

with other main services.with other main services.

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Signaling Transfer Points (STPs)

• STPs are ultra-reliable, high-speed packet

switches at the heart of SS7 networks,

• They terminate all link types except “F” links.

For reliability reasons, they are nearly always

deployed in mated pairs.

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STP Functions

• SS7 Message routing

• Global Title Translation

• SS7 Network Management

• Network Interconnection• Network Interconnection

• Gateway Screening

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Message Routing

• All nodes in the network are identified by a

unique point code.

• This point code is used by CCSS #7 as the

Origination Point Code (OPC) and theOrigination Point Code (OPC) and the

Destination Point Code (DPC) in the routing

label of all Message Signaling Units (MSUs).

• STPs have the ability to route messages to all

types of signaling points.

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Global Title Translation

• By using SCCP to translate

addresses (Global titles) from

signaling messages that do not signaling messages that do not

contain explicit information allowing

the MTP to route the message.

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Network Management

• Acts as traffic cop to route traffic around failures in

a network, and to control link congestion.

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Gateway Screening

• Screening is the capability to examine Incoming and

Outgoing packets and allow those which are

authorized. This is done by going through a series of

Gateway screening tables that must be configured by

the service provider

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For internal circulation of BSNL only

Why SSTP is required in BSNL

• When any mobile subscriber roams to other Service

Area then the signaling traffic or SMS are being handled

by the signaling channel of BSNL taken by private

operator against POI. BSNL is not able to measure the

traffic and kind of traffic. By putting SSTP in system we traffic and kind of traffic. By putting SSTP in system we

can measure the traffic and bill to private operators.

• It will enable migration from TDM based network to IP

based networks.

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EAGLE 5 Integrated Signaling System

• EAGLE 5 ISS is a large-capacity, multi-functional,

Signaling Transfer Point (STP). This system can grow

from a single-shelf, 80-link STP to a multi-frame, 2000-

link STP. link STP.

• The EAGLE 5 ISS does not have a separate central

processing unit to bottleneck traffic throughput.

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Features

• Exceptional Capacity: The system supports up to 2,000

links, one million global title translation (GTT) table

entries and 384 million subscriber records.

High Performance: • High Performance: Transaction speeds of up to

640,000 message signaling units (MSUs) per second.

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Features

• Flexible Interconnection: Supports multiple link interface types, including 100 Base-T, DS0A,, E1/T1 ATM HSL, channelized E1 and T1,and synchronous E1 HSL (SE-HSL).

• Network Security: Because signaling connectivity to other service providers is centralized at the EAGLE 5 ISS, gateway screening is centralized and not required ISS, gateway screening is centralized and not required at multiple switches.

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IP Connectivity

• The EAGLE 5 ISS provides connectivity between SS7

and IP networks, enabling messages to pass between

the SS7 network domain and the IP network domain.

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Number Portability

• Number Portability (NP) functions allow a subscriber

to change location, service provider, or service while

keeping the same directory number.

• Number portability is simplified by integrating

advanced database management and signaling

functions directly into the EAGLE 5 ISS platform.

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Subsystems

• The EAGLE 5 ISS consists of the following

subsystems

• Maintenance and Administration Subsystem

(MAS)

• Communication Subsystem (Gigabit

backbone)

• Application Subsystem

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EAGLE frames

• There are five types of EAGLE frames:

• Control Frames

• Extension Frames

• Miscellaneous Frames• Miscellaneous Frames

• General Purpose Frames

• OAP Frame (not shown)

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For internal circulation of BSNL only

Control Frame (CF)

• Principal frame for system.

• Control shelf contains all components of Maintenance

Administration Subsystem (MAS)

• Control shelf with up to ten application modules.• Control shelf with up to ten application modules.

• Up to two extension shelves, each with up to 16

application modules.

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Extension Frames

• Extension Frames (EF)

• Provisioned when more than two extension shelves are

needed.

• Up to five per system (EF-00 to EF-04)• Up to five per system (EF-00 to EF-04)

• Up to three extension shelves mounted in each frame

(EF-04 has one extension shelf)

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General Purpose Frame

• Integrated Sentinel- Sentinel Processor Frame ( SPF)

• Extended Services Platform (ESP)

• Sentinel Processor Frame (SPF)

• Multi – Purpose Server.

• These frames are numbered GPF – 00 through GFP-

xx

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Miscellaneous Frame

• Optional frame

• May be equipped with a Fuse Alarm Panel (FAP)

• Equipment accommodated holdover clock: test

equipment: jack panels: spare card shelf; printer;

terminal; etc

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Alarm Side Panel

• Provides -48VDC lamps for critical, major, and minor

alarms (bulb part number: 525-0036-02)

• Connects to row alarm connector (row ALM) on control

shelf.shelf.

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THANK YOU !THANK YOU !

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