set modem off effect on a PRI (was Re: (PM) Bad modem)

Mike Tancsa (mike@sentex.net)
Tue, 23 Mar 1999 22:20:57 -0500

At 09:20 PM 3/23/99 , Russ Taylor wrote:
>On 3/23/99 6:00 PM, Mike Tancsa (mike@sentex.net) wrote
>
>>On PRIs if you busy out the modem, you busy out the rest of the span.
>>show modem
>
>The hell it does -- we have three PM cards with bad modems (out of 1 PM-4
>and 8 PM-3s, so not too big a deal). Two of the bad modems self-down,
>the third one has to be manually disabled with a "set modem 30 down". It
>has absolutly no effect on the PRI span -- that's why you want 48 modems
>for a 2PRI unit (2 spares), or 50 for a 2CT1 unit. This particular
>portmaster is smack in the middle of our dialup pool, we'd know if it
>wasn't taking a full 46 calls.

It does on our PRIs. If you have 4 PM3s with half the pool filled and if
only _45_ modems are available (i.e. 3 are dead or off) on the next PM3,
and 45 calls then come in, the next analog call will get a busy signal. If
you have an ISDN call on there, you will be OK. Search through the
archives. Its been documented / explained before.

---Mike
**********************************************************************
Mike Tancsa, Network Admin * mike@sentex.net
Sentex Communications Corp, * http://www.sentex.net/mike
Cambridge, Ontario * 01.519.651.3400
Canada *
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