[cisco-voip] Four-wire Analog E&M?

[Jason Roysdon]

Jeff,
Nope, FXO ports won't work.  Yes, you need the VIC2-2E/M to talk to E&M
lines.  Hopefully you can get the wiring info from Qwest, otherwise it's
a bit of a pain.  I struggled for a bit to get one wired up to a Lucent,
but solved it eventually (I think by trial and error... there are only
so many combinations a 4 wire can be wired up as, but it's not as easy
as two wires!).  But the complication comes in that there are 4 (Type I,
II, III, & V) different E&M configurations, and also a 2-wire and 4-wire
method (but at least you know it's 4-wire).  Find out all that info from
Qwest ahead of time:

Wiring pino-uts, E&M Type (I, II, III, or V) and what type of signalling
(wink-start, etc.).

If you get stuck troubleshooting, look for Cisco Document ID 14001
"Analog E&M Troubleshooting Guidelines (Cisco IOS Platforms)"

>From this guide:
"Step 2: Confirm the PBX E&M Configuration Parameters
The Cisco router/gateway needs to match the PBX configuration. One of
the challenges of configuring and
troubleshooting analog E&M circuits is the amount of configuration
variables that are present. These
guidelines help to determine the information to be gathered from the PBX.
· E&M Signaling Type ( I, II, III, V)
· Audio Implementation (2−wire / 4−wire)
· Start Dial Supervision (wink−start, immediate, delay−dial)
· Dial Method (dtmf, pulse)
· Call Progress Tones (Standardized within geographic regions)
· PBX Port Impedance
Note: E&M Type IV is not supported by Cisco router/ gateways. E&M Type V
is the most common interface
type used outside of North America. The term Type V is not commonly used
outside of North America. From
the viewpoint of many PBX operators there is only one E&M type (Type V)."


Jason Roysdon

> Qwest dropped off what appears to be two four-wire analog E&M lines to
> use as CAMA trunks (communication with Qwest has not been the best on
> this order).  Am I correct in assuming that a VIC2-4FXO cannot be
> configured to support these lines?  From what I can see on Cisco's
> site I'll need a VIC2-2E/M card to support these lines.  These are
> getting plugged into a 3845 router.
> 
> -- 
> Jeff Ollie