[comp.dcom.telecom] Looking for PBX w/ CPC or Ground Start

jimmy@denwa.info.com (Jim Gottlieb) (12/16/89)

As we outgrow our KX-T1232, we are looking for a new PBX.  Of course
we want all the normal PBX features like ARS and DID; what we want
that is a bit unusual is the ability to have station lines that are
ground start or at least provide a CPC signal (a momentary open) when
the calling party hangs up.

The only switch that I have personally witnessed this on was a NEC
NEAX 2400.  The analog ports on the NEC received CPC.  However, a
friend reports that he checked another NEAX 2400 and found that not to
be the case.  Perhaps there are several varieties of analog station
cards.

I would appreciate hearing from anyone that knows of a switch that does
what we want.  Thanks...

macy@hal.cwru.edu (12/17/89)

In article <2187@accuvax.nwu.edu> Jim Gottlieb <denwa!jimmy@anes.ucla.edu> 
writes:
>X-Telecom-Digest: Volume 9, Issue 575, message 5 of 13

>As we outgrow our KX-T1232, we are looking for a new PBX.  Of course
>we want all the normal PBX features like ARS and DID; what we want
>that is a bit unusual is the ability to have station lines that are
>ground start or at least provide a CPC signal (a momentary open) when
>the calling party hangs up.

>The only switch that I have personally witnessed this on was a NEC
>NEAX 2400.  The analog ports on the NEC received CPC.

Wow, this is a tough one.

Most XBAR and SXS systems had this, of course.  Even 101ESS Centrex CU
appliques had it.  But on a modern electronic PBX in the 100 line
range?

If you were big enough, you could get the PBX version of the 5ESS or
DMS-100 (SL-100), and they could be equipped with the right station
cards to do it...

The only system I know of that might have it (definite maybe here) is
Redcom.  As a manufacturer of small CO's, you might be able to fit
their system with the right kind of line cards, if the software could
handle it.

You might ask National Telecom / Solid State Systems (in Atlanta) if
their Jr. Exec or other switch could do it.  These systems are
somewhat specialized....

There's a lot of similarity between some of the Northern Telecom
systems and their small CO's....but you'll have to talk to their
engineering people to confirm this.

A hint: If the switch can be fitted to provide answer supervsion
(reverse battery) on the ports, then it's probably going to do the
job.

Wanna buy an old OKI 200 line crossbar switch?  I'm pulling one out in
January from a hotel...


 Macy M. Hallock, Jr.     macy@NCoast.ORG         uunet!aablue!fmsystm!macy
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dave@uunet.uu.net (Dave Levenson) (12/18/89)

In article <2187@accuvax.nwu.edu>, jimmy@denwa.info.com (Jim Gottlieb) writes:

> As we outgrow our KX-T1232, we are looking for a new PBX.  Of course
> we want all the normal PBX features like ARS and DID; what we want
> that is a bit unusual is the ability to have station lines that are
> ground start or at least provide a CPC signal (a momentary open) when
> the calling party hangs up.

The AT&T System 25 provides a 500 msec open loop on its Tip & Ring
station lines when a call is disconnected.  I don't know any way of
getting ground-start station lines, but CPC is definitely available.


Dave Levenson                Voice: (201) 647 0900
Westmark, Inc.               Internet: dave@westmark.uu.net
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