Page 438 - IRSEM_Main Book

Quad Cable: MSDAC evaluator to each DP requires 1 quad of 4 conductors. A separate 6
quad cable is used for each DP of dual detection (main + Stand-by) from the nearest Half
location box provided for Signal cable termination at signal location. From IB Hut to Half
location box one 6 quad each is used for UP & DN directions.

The media between Station to IB location is duplicated by providing 6 Quad cable in
addition to OFC cable. The OFC as well as Quad ethernet switches work in hot stand-by
mode with seamless change over to each other without disturbing the communication
working.

Disclaimer:

(1) The scheme given above, was adopted in 2018-19 in Anakapalle - Bayyavaram section in
Vijayawada divn/SCRly, is only for Technical information of signal Engineers and does not
indicate endorsement of any particular make of MSDAC.

(2) Scheme will have to be suitably modified as per Technical requirements/Facilities in
particular make of MSDAC & other equipments being used.

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Encl: Drawings are given at 18-D1, 18-D2, 18-D3 in Appendix -II

Chapter 18: Block Instruments, BPAC& IBS Working Page 386 of 535