In a message dated 12/17/2000 5:56:24 AM,
weather@... writes:
>i think there's an optimum number which is the theoretical maximum number
>of
>modules which can be powered, less a couple to allow for things like 181
>keyboards. i designed each of my cabinets with this in mind
>if possible, the MTA connectors could be given a little more space though...
In a message dated 12/17/2000 8:22:01 AM,
jpont@... writes:
>> So the question is, how many MTAs? 16? 20? These are for "big ass cases".
>I
>> am
>> thinking maybe 18 is a good number.
>>
>I suppose it depends on how big the ass of your case is. I doing some
>sketching out of modules in cases using the current line and the proposed
>line of motm modules, some (gu)estimates:
>3 rows, 10U wide rack case: about 18 per case
>4 rows, 10U wide rack case: about 25 per case
>3 rows, 14U wide case: about 27 per case
>
>These (albeit limited) (gu)estimates indicate a minimum of 18 mta's up
>to
>maybe 28 (the latter seems a bit high). 24 would probably cover many of
>the top 2 examples.
I think Paul B has the right idea, base the number on the PSU current
capabilities and the average module consumption. I also agree that it might
be nice to have a little more space for the connectors themselves though I
rarely unplug them at the PSU side once they are plugged in.
And being a big ass, I can add to Jeff's points too. My plan is to build a
cabinet of three rows by 24U wide which will probably have about 40 modules
requiring power when it's finished (I will be using two of the legendary 12U
flat cabinet rails). I am using a 1.5A supply, and I think that will be more
than enough for the 40 modules (didn't Paul say that the 900's 0.8A supply
would be enough for 40 modules?). So I'd imagine 20 output connectors per
block would be enough since the larger cabinets could just use two of these.
JB