>>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.
As I said "that's why you want 48 modems for a 2PRI unit" -- I'm well
aware of how the PM-3 allocates modems. If you have multiple dead modems
on a chassis, you really ought to RMA the cards. That's not a function of
idling out the modem -- that's a function of not having enough DSPs left
to populate your PRIs, so yes, you certainly _are_ screwed if you let
your PM-3 lose too many modems, or if you're goofy and try to run a mixed
ISDN/dialin chassis without a full complement of modem cards.
Busying out a modem does not cost you a channel on your PRI, which was
what your post that I was replying to said. Having a shortage of DSPs
can cost you channels -- and it probably means your roll sequence will
break as well.
By the way, if it wasn't just dying modems that put you there, it's not
very wise to purchase a PM-3 in a 3x10/2x8 configuration for dialup use
-- that leaves you with a malfunctioning PM-3 if you lose even one DSP,
and they _do_ have a noticable failure rate (3 cards out of 40 for us).
-- Russ Taylor (rtaylor@cmc.net, http://www.cmc.net/~rtaylor/) Chambers Multimedia Connection Help Desk "When you pay for Dupre, you get Dupre"- To unsubscribe, email 'majordomo@livingston.com' with 'unsubscribe portmaster-users' in the body of the message. Searchable list archive: <URL:http://www.livingston.com/Tech/archive/>