Do I have to use 2 wires/pins Rj11 cable to interconnect FXS and FXO interfaces??

[CCC4046_2]

Hi,

According to the Cisco Doco, below setup (part 4) should work if all requirements are met.

http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00803736c1.shtml

and

http://www.networkworld.com/community/node/33087

However, I find it very difficult to find a 2 pins/wires Rj11 cable. Does it really need to be a 2 pins/wires one?

Also, I have tested with a normal 4pins Rj11 btw FXS  and FXO interfaces and I did not see link lights comingup.

Any ideas?

[Steven Holl]

Well the ports themselves only look at a single pair, so tip and ring (2 wires total) is all that the port will look at.  Though it is wise to not use 4-conductor wiring anywhere, since you can potentially get analog crosstalk when doing that.

You don't have a concept of a link light on an analog circuit.  There is not a pulse to test for a link connection on the other side with FXS/FXO.

Just use a cable that is straight through (tip-to-tip, ring-to-ring) and you should be good.  Crosses cables (tip-to-ring) will not work.  Then place a test call across the circuit, and use 'debug vpm sig' or 'sh voice call sum' to see what the state of the port on the other side goes to.

[CCC4046_2]

Thanks Steve once again.

And I am new to Cvoice and hope doing this would help learning.