[c-nsp] rescue router for DS3 service

[Bill Wichers]

> I've got some multichannel DS3 circuits and was wondering about using
> Y-cables so I can terminate the circuits on a rescue-router.
> Hardware involved is 7206vxr chassis and PA-MC-T3 and PA-MC-2T3+ ports.
>
> Physically, can this be done?

No, this can not be done. You can't split the DS3 cable since you'll mess
up the cable impedance, cause reflections, and alter all the signal levels
on the wire. What you're talking about would be like using one 10/100
Ethernet port to serve two computers, which would present all the same
kinds of problems

> Would the rescue-router have to be powered down,
> or would just shutting the redundant ports be enough?
>
> Or, are there special electronics needed to provide this kind of
> redundancy on a platform that was not designed for this?  Maybe a
> switch box with one DS3 input and two DS3 outputs with serial access
> for commands?

I've never heard of anyone trying this. I suppose you could use a digital
cross-connect box to reroute a DS3 port to a second PA-MC-T3 if the first
failed, but I don't think it could be 'auto'.

     -Bill

*****************************
Waveform Technology
Systems Engineer