Question about Cisco router cable, DB-60 male to V.35 male, verified to V.35 Standard, 3 meters long (721004)

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V.35 Cable Local Loop

For test the V.35 cables and the Wic1T, i need to make a physical local loop (B3) with a V.35 cable. With the V.35FC cable there is no problems, looping this pins:
J2·C-->J2·D (RTS-->CTS)
J2·E-->J2·H (DSR-->DTR)
J2·P-->J2·R (SD+-->RD+)
J2·T-->J2·S (RD- -->SD-)

the result is that the interface serial changes to looped status.
but the same procedure on the V.35MT cable don´t make the loop.
¿Any solution?Thanks!
V.35 pinouts:
http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a00801f5d8e.shtml

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If your trying to establish a loopback for the Data Terminal Equipment, you seem to have satisfied the RTS/CTS, DTR/DSR loopback. At the V.35 end of your cable, you need to loopback the SD (balanced pairs) to the RD (balanced pairs), as well as insure that you have a valid clock source. Usually the DCE provides clock on a balanced pair SCT, SCR. towards the DTE. But, when you build a loopback cable or adapter, you can obtain clock from the DTE via the SCTE pair and tie it to the SCT and SCR balanced pairs. A lot of the requirements depend upon the DTE and DCE equipment your testing. Hope this helps...

Posted on Mar 11, 2009

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