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From: brian@ucsd.edu (Brian Kantor)
Newsgroups: comp.dcom.telecom
Subject: Re: Recall / Flash Hook
Message-ID: <5422@accuvax.nwu.edu>
Date: 20 Mar 90 14:19:23 GMT
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Reply-To: Brian Kantor <brian@ucsd.edu>
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X-Telecom-Digest: Volume 10, Issue 189, Message 8 of 10


In article <5379@accuvax.nwu.edu> vances@xenitec.UUCP (Vance Shipley) writes:
>Quoting from the EIA Standard RS-464 Private Branch Exchange (PBX) Switching
>Equipment for Voiceband Applications:
>		4.8.3.5.1	If flash signals (momentary on-hooks) from
>	the remote terminal are used by the PBX to initiate internal calling
>	features, the PBX shall ignore an on-hook signal of 150 ms or less;
>	interpret an on-hook signal of 300 ms to one second as a valid
>	flash; interpret an on-hook signal of 1.5 seconds or greater as a
>	valid disconnect.

Pity some didn't take notice of that when they were writing the
software for their stuff: our campus MD-110 switch seems to think that
just about any single pulse is a flash.  You can't pulse-dial any
number with a 1 in it.  Played hob with the outdial modem pool until we
managed to educate the users NOT to turn off tone dialing.  Those with
the older Racal/Vadic dialers that ONLY pulse-dial just had to upgrade....
	- Brian