Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!amdcad!rpw3
From: rpw3@amdcad.AMD.COM (Rob Warnock)
Newsgroups: comp.dcom.lans
Subject: Re: status lights on lan equipment
Message-ID: <22205@amdcad.AMD.COM>
Date: 24 Jun 88 11:19:52 GMT
References: <5808@dcatla.UUCP> <9750@g.ms.uky.edu>
Reply-To: rpw3@amdcad.UUCP (Rob Warnock)
Organization: [Consultant] San Mateo, CA
Lines: 27

+---------------
| One which occasionally is very bothersome here ...
| On these terminal server boxes (in our case, UB NIU-180's), have
| a light per port saying if it's busy.  Maybe two lights -- one that 
| it's in use and another saying that i/o is active.
| <---- David Herron - 
+---------------

Long time ago at Dig. Comm. Assoc. (DCA), on our statistical multiplexers
we supplied a single LED per port, encoded this way:

	1. Idle port, LED is off.
	2. LED flashes on in time with "RING".
	3. LED comes on solid with carrier (CD) [or DSR, some configs], but...
	4. ...flashes *off* for received/transmitted data.

It took a new customer or tech all of 30 seconds to learn to correctly
interpret what was going on with any given port. (The "ring" flashes
were *never* confused with "data".)


Rob Warnock
Systems Architecture Consultant

UUCP:	  {amdcad,fortune,sun,attmail}!redwood!rpw3
ATTmail:  !rpw3
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