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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!news.acns.nwu.edu!telecom-request
- Date: Sun, 23 Aug 1992 01:28:46 GMT
- From: vances@xenitec.on.ca (Vance Shipley)
- Newsgroups: comp.dcom.telecom
- Subject: Re: Analogue Problems With Digital Switches
- Message-ID: <telecom12.653.6@eecs.nwu.edu>
- Organization: SwitchView Inc., Waterloo, Ontario
- Sender: Telecom@eecs.nwu.edu
- Approved: Telecom@eecs.nwu.edu
- X-Submissions-To: telecom@eecs.nwu.edu
- X-Administrivia-To: telecom-request@eecs.nwu.edu
- X-Telecom-Digest: Volume 12, Issue 653, Message 6 of 11
- Lines: 45
-
- > Anyway, I performed a quick test, which proved that there is no CPC
- > through the analog line ports of the Northern PBX switch....
- > ... We looked in to converting the affected lines to E&M trunks,
- > with E&M to loop start converters (Northern says that the analog
- > trunks, as opposed to lines, do have CPC.), but at $500 or more per
- > line for the converters. Why not loop start trunks, instead of lines?
- > No ring voltage! oh well. In the end, Corporate has had to install a
- > bunch of CO lines to the affected lines. Meanwhile, they have
- > promises from Northern for a fix "soon".
-
- Well it is true that the SL-1 (or M-1 if you prefer :)) does not
- provide CPC on the 500 lines Northern have tried to help out in the
- short term with a software fix. A new class of service provides for
- the return of dial tone after the calling/called party has
- disconnected. This may be less than what we really want but I take it
- that the existing line cards would not support a line reversal type
- CPC signal. Since CO lines do not always provide CPC many
- manufacturers of CPE equipment such as answering machines and voice
- mail recognize that the return of dialtone signifies a disconnect and
- these will work well with the new SL-1 feature.
-
-
- In article <telecom12.619.5@eecs.nwu.edu> rickie@trickie.uucp (Richard
- Nash) rants:
-
- > DONT HOLD YOUR BREATH!!! You will turn red, then blue, then black
- > doing so:) :) :)
-
- > Soon means sometime this or next year, or perhaps after somebody real
- > important has leaned on them real hard threatening all sorts of
- > litigation! :) :) They don't give a damn about accounts less than a
- > couple million clams! :) :) :) :)
-
- NT as well as any company makes mistakes. Most like this one are done
- because no one put it in the design spec, the engineer doesn't know
- what we'll do with it when he's through :). That's for people like
- us.
-
-
- Disclaimer: I don't work for NT and I speak solely for myself.
-
- Vance Shipley vances@xenitec.on.ca vances@ltg.uucp
- ...uunet.ca!xenitec!vances
-
-