Call Supervision - DMS-10/100, 5ESS
rog...@engr.uvic.ca
I need to find out whether the DMS-10, DMS-100, and 5ESS switches send
a loop disconnect signal to the subscriber upon a far-end disconnect.
I have heard that some North American c.o. switches signal subscriber lines
by sending a "loop disconnect signal" lasting ~800 msec, while some European
and Asian switches would send a polarity reversal signal. Further, several
economy switches send a busy tone to the called port.
Any information at all concerning this topic would be appreciated.
Ryan Oglow
rog...@glenayre.com
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Dan J. Rudiak
rog...@engr.uvic.ca wrote in article <8480160...@dejanews.com>...
> I need to find out whether the DMS-10, DMS-100, and 5ESS switches send
> a loop disconnect signal to the subscriber upon a far-end disconnect.
This feature is available to most, if not all, subscribers in North
America. Some telcos offer it standard, others require you to ask for it,
others charge a fee for a "quicker" signal. (i.e.. Standard signaling would
come through @ 3-7 seconds after disconnect, quicker would be 0-3 seconds
after.)
Incidentally, even if a switch does battery reversal, it still has to open
the circuit to switch the polarity, so any equipment that recognizes OSI,
will accept a battery reversal as a proper signal. (Assuming it can
recognize the relatively quicker open circuit of the battery reversal.)
--
Dan J. Rudiak
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Ross West
We have GTD-5's and DMS-100's all around, and they both offer loop
disconnect signals...all it is, is a polarity reversal 10 seconds after
the remote party has hung up. Of course, the 10 second thing might be
different for you in your area, but that is generally how the system works.
I've heard of a fast-disconnect on the DMS-100, which is basically the
same as the standard, but it is 2 seconds after remote disconnect. Also,
you usually have to ask for this service, and pay a nominal fee for it to!
[HellPhiirE]
rog...@engr.uvic.ca wrote:
: I need to find out whether the DMS-10, DMS-100, and 5ESS switches send
: a loop disconnect signal to the subscriber upon a far-end disconnect.
: I have heard that some North American c.o. switches signal subscriber lines
dav...@super.zippo.com
rog...@engr.uvic.ca wrote:
>I need to find out whether the DMS-10, DMS-100, and 5ESS switches send
>a loop disconnect signal to the subscriber upon a far-end disconnect.
>I have heard that some North American c.o. switches signal subscriber lines
>by sending a "loop disconnect signal" lasting ~800 msec, while some European
>and Asian switches would send a polarity reversal signal. Further, several
>economy switches send a busy tone to the called port.
>Any information at all concerning this topic would be appreciated.
>Ryan Oglow
>rog...@glenayre.com
>-----------------------------------------------------------------------
>This article was posted to Usenet via the Posting Service at Deja News:
>http://www.dejanews.com/ [Search, Post, and Read Usenet News]
Do not know how it does it, but there is a feature in the DMS-100
called COD cutoff on disconnect which can be added to a customers
line that will prevent an answering machine tape from filling up with
the sound of a busy signal when the caller hangs up withouy leaving
a message.
I believe the 5ESS does this automatically. Not sure about the DMS-10
tho! Hope this help some.
Dave.
Ross West
#5ESS, DMS-10, DMS-100, GTD-5 EAX, GTD-SPI etc all send the same
disconnect signal. After the calling party has hung up, the switch
timesout after approx. 10 seconds (programmable by telco), the voltage on
the ring and tip drops from about 6-10 VDC, to 0 VDC, reverses polarity
for about 1 second, and then goes back to the original polarity and the
voltage goes back to about 48 VDC. This can all be detected by the called
party's answering machine or whatever, so that it hangs up about 10
seconds after the caller hangs up.
It is this principal of the switching system, that is needed for
hobbyist's to build projects that will hangup after the caller hangs up.
There are many ways to detect this signal, ranging from really simple
opto-isolater's, all the way up to specialised IC's from the big
companies.
[HellPhiirE]