PowerPoint Presentation On EWSD

PPT On EWSD

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EWSD Presentation Transcript:

1. TELEPHONE EXCHANGE
A TELEPHONE EXCHANGE IS A SYSTEM OF ELECTRONIC COMPONENTS THAT CONNECTS TELEPHONE CALLS. CLASSIFICATION OF TELEPHONE EXCHANGE LOCAL EXCHANGE TELEPHONE EXCHANGE LEVEL

2 TELEPHONE EXCHANGE LEVEL
1 GATEWAY EXCHANGE
2. MAIN DISTRIBUTION FRAME(MDF) The fault of telephone number is removed in the MDF; hence it is called as Fault Remove Section. For any type of testing firstly we need the vertical no. or N.E. number of that particular telephone number, than this number is tested by the live tester, printer and computer. Live tester shows us that which type of fault occurs for that particular telephone number. The telephone numbers are also disconnected in the M.D.F., because of some specific reason.

3. ELECTRONIC WORLDWIDE SWITCH DIGITAL (EWSD)
The EWSD are Digital switching system is an integral part of the Powerful Network Solutions. The EWSD switch is designed for incremental expansion in processing power, connectivity and services.

4. BASIC ARCHITECTURE
Digital line unit (DLU) Line/Trunk Group (LTG) Switching Network (SN) Coordination Processor (CP) Common Channel Signaling Network Control(CCNC)Unit or Signaling System Network Control (SSNC)

5. Digital line unit (DLU)
 Functional unit on which subscriber lines are terminated. A single DLU has 4 Shelves, 16 Modules, and 16 Port. Module stands for subscriber line module analog(SLMA). Port stands for subscriber supported by the Module. A Unique Equipment Number(NE) is given to each subscriber. Example-NE of a subscriber is represented by 10-1-1-14

6. Line Trunk Group (LTG)
Digital Trunks and DLUs are connected to LTGs. The line/trunk groups (LTG) forms the interface between the digi­tal environment of a EWSD exchange and the switching network (SN). Call processing functions Safeguarding functions Operation and maintenance functions

7. Coordination Processor (CP)
 It is used for system-wide coordination functions, such as, routing, zoning, etc. However each subsystem in EWSD carryout practically all the tasks arising in their area independently. Storage and administration of all programs, exchange and subscriber data, Communication with operation and maintenance centers, Handling of the man-machine interface.

8. Switching Network (SN)
All the LTGs are connected to the SN which inter connects the line and trunks connected to the exchange in accordance with the call requirement of the subscribers. CCNC and CP are also connected to SN. Different peripheral units of EWSD are connected to the SN via 8192 kbps highways called SDCs (Secondary Digital Carriers).

 9. Switching Techniques In SN
Time Switching The speech samples are stored and transferred to the output during a different timeslot, this technique of timeslot interchange of information is called time switching. In the time switch, the incoming information is written sequentially in a memory.

10. For more please refer our PPT. Thanks.