Lightninghorse
You of course are absolutely right about the difference between T1 E&M with it's channel asociated signaling and 23B+D PRI.
Most of the vendor's and my own engineers at least seem to realize they don't work the same.
Their confusion seems to come from the fact that our PSTN access is PRI. The PBX we have does not do PRI. We convert the PRI to T1 E&M using an Adtran Atlas 550. An Asterix or other device would do the same. So that layer of confusion is all ready in place. :rolleyes:
BTW, I am not at all confused as to how my system works. I did the upgrade and conversion to the PRI PSTN interface through the Adtrans. I configure and maintain this phone system daily. I love my system.
Sounds a little like I need a life outside work?
On to your next paragraph.
All the T1 connections to the PBX terminate on a DSX. From there they are copper cross connected to DACS T1 ports which also terminate on a DSX.
The two PRIs terminate on a DSX and are connected to the Adtran ports which are also terminated on a DSX.
The new PBX will have all T1/PRI terminated on a DSX. They will be cross connected to DACS T1 ports terminated on a DSX.
This gives us plenty of monitoring and patching capability to accomplish the same thing as plugging/unplugging using bantam type patch cords.
This will not be cheap but may not be as costly as you think since the DSX and DACS T1 ports all ready exist as part of our system.
The actual connection of the T1s to the existing system is almost trivial. The question of if the new PBX can toggle the right bits on the T1 at the right time to make phones ring or get dial tone seems to be unanswerable. :shrug:
