[273] in Resnet-Forum
Re: Category 5 Cabling Standards
daemon@ATHENA.MIT.EDU (Norman Goetz)
Wed May 18 18:49:57 1994
Date: Wed, 18 May 94 15:26 PDT
From: goetz@reed.edu (Norman Goetz)
To: matera@nexus.chapman.edu, resnet-forum@MIT.EDU
There are some issues regarding how you terminate the ends. I would recommend
using Cat 5 rated punchdown blocks on the hub end. AT&T 110 blocks are OK,
and other vendors like MOD-TAP or Leviton Telcom may have something also.
It's less clear on the user end. We consider it worthwhile to buy Cat. 3
wallplates and replace them later if necessary with Cat. 5 for the few
users who will need 100Mb. But you may think otherwise depending on future
anticipated needs or present surplus of financing. The 2 things you don't
want to do are replace the wire later or tear up your wiring closet to
upgrade the punchdown blocks.
Whichever punchdown block you use, be sure that you specify that the
twisting of the wire pairs be maintained up to the cutoff point on the
block. Untwisting the last few inches is common in phone installations
but will not carry 100Mb. Experienced installers know this, but if it's
in your spec and a new guy does it wrong you can have it redone.
Don't hesitate to inspect what's going in on the first day. It's hard to
write a specification that can't be misinterpreted in some way. It's a l
easier on everyone to redo the first 5 rooms instead of the whole building.
You will never know for sure how they are going to install it until they
start doing it.
Norman Goetz Network Technician Reed College
audio: (503) 771-1112 X 646 Internet: goetz@reed.edu
This has been a test life. This was only a test. If this had been an actual
life you would have been given instructions on where to go and what to do.
