Re: (ASCEND) Ascend Max T1 and FR backup

[Peter Lalor <plalor@infoasis.com>]

>From: Randy Martin <ascend@austintx.net>
>
>At 12:18 PM 4/30/2000 -0700, you wrote:
>>>I use a pipeline 130 with both a T1 and a BRI to feed my max4004
>>>That way I not only have the automatic switchover to BRI for
>>>backup up but also  have all 4 t1/pri's on the 4004 available
>>>for incoming analog and ISDN dialback.
>>
>>That is simpler and more reliable as far as the backup goes. However, the
>>general consensus on the list seems to be that 40xxs are too
>>processor-limited to handle all four T1/PRIs at once without performance
>>suffering. Of course, Pipeline 130s aren't exactly held in high regard
>>either, but I like 'em okay.
>
>What you're saying about 40xxs is not entirely true. It's been my
>experience over the last five years that you can put four PRIs on a 4000
>without any problems IF YOU FOLLOW A FEW SIMPLE GUIDELINES.
>
>- - You will definitely have a problem if you try to run all the PRIs as
>dialup MODEM PRIs. The power supplies in the MAX won't handle it. You will
>also run into a cooling problem.
>
>- - You can, however, run four PRIs on a 4000 if you run two of them for
>dialup/dedicated ISDN ONLY and the other two for dialup modems.
>
>We've run 4000s this way for years without a single death due to
>overheating or burnt up power supplies. This only works with the
>later-model 4000s that have the 20A 5V supply, not the 10A 5V supply.

This is definitely good advice for improving the longevity of a 40xx.

However, what I'm referring to is that people have repeatedly stated 
on this list over the years that 40xxs slow down measurably with all 
four T1 ports in use. I have never used all four ports on a 4000 much 
less attempted to measure any performance hit, but I thought Tim 
might want to know what people were saying before he leaps in. With 
any luck, someone who actually knows the facts on this first-hand 
will leap in shortly and bang us on the head with the gory details.
-- 

Peter Lalor           Infoasis
plalor@infoasis.com   http://www.infoasis.com/

"Where's my burrito?" -- Homer
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