[nsp] Q931 ISDN PRI back-to-back (vaguely cisco!)

[John Edwards]

Stephen J. Wilcox wrote:

>Hi,
> if I want to connect two primary rate isdn devices back to back (specifically 
>PBX to a Cisco eg 3600/5200/5300) what is required? 
>
>Does the E1 require any line driver/CSU etc or can I simply cross Rx/Tx?
>  
>

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a008007fe72.html

The feature is called 'Network side PRI', and it looks like the 5200 is 
excluded. Also, it's something supported by many PBX systems. At the 
physical layer, it is as simple as crossing TX and RX.

It comes in handy for evaluating dialup configurations on spare 
equipment without having some kind of exchange emulator or provisioning 
additional circuits from telcos.

John Edwards