I believe that there is an EIA standard for these dimensions.
----------
From: Schanker, Jack [SMTP:[email protected]]
Sent: Wednesday, October 27, 1999 2:53 PM
To: [email protected]; Brian Harlowe
Subject: RE: Electronic unit panel sizes
Brian:
My understanding is that the U comes from "rack Units", where the
incremental rack height is 1.75 inches and then continues in integer
multiples. So, 7.0" 8.75" etc are all allowable rack panel heights,
but 11.0
inches is not. It sounds to me like the American who chose 11 inches
for a
rack-mounted piece of gear made a bad choice.
If they made that bad choice, you also want to carefully check the
number
and spacing of the mounting holes on the front panel or rack ears to
see if
they align with standard rack rail hole spacings (I don't have that
information handy, and seem to recall more than one "standard"
(sic)).
This may not be any help except to confirm that you're correct, not
crazy.
Regards,
Jack
Jacob Z. Schanker, P.E.
Director of Agency Compliance
Adaptive Broadband Corporation
175 Science Parkway
Rochester, NY 14620 USA
+716 242 8454 (voice)
+716 241 5590 (fax)
[email protected]
<mailto:[email protected]>
----------
From: Brian Harlowe [SMTP:[email protected]]
Sent: Wednesday, October 27, 1999 12:30 PM
To: [email protected]
Subject: Electronic unit panel sizes
Excuse me from drifting away from the main topics of this
forum. But
can one of you whizzy american engineers help a poor
englishman out.
In the UK ( and Europe) front panels are measured in Us
where 1U
equals 1.75 ins or 44.45 millimetres.
Does this system operate in the states? The reason I ask is
we have
an American unit to accomodate that 11 inches high which
works out
at
6.29U!!!
Help
Brian Harlowe
* opinions expressed here are personal and in no way reflect
the
position of VG Scientific
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