Sun / CalComp Printer networking problems (was: Thick Ethernet/Sun networking problems) - test-drb@ccmp.vtda.org

8 Nov 2001

Hi, Arno.

On Nov 8,  7:50, Arno Kletzander wrote:

...
  at first: Is it okay to continue our mailing this way
(directly mailing the
...
  messages, only CCing to Classiccmp.org? It's
because I'm on the Digest and it
...
  has been arriving at about 4 P.M. local time the last
few days, which is too
...
  late for me to stay in school and pick it up the same
day (alas, don't have
...
  Internet at home yet). 
Yes, that's OK.  I don;t know if you'll necessarily get a faster response,
but it's worth a try :-)

...
  No, nothing on that board. There are only two 2pin
jumpers, one for printing
...
  out the adapter's status page and one for
resetting the NOVRAM contents to
...
  the factory defaults. I think I've already seen
what you mean on other network
...
  devices (six or so 3-pin jumpers, the movable parts
sometimes joined in a
 blue plastic tray). 
OK.  It's probably a little more modern than I thought, then.  I guess it
senses that it is receiving link pulse on the 10baseT interface and uses
that, otherwise it uses the AUI.

...
  >But no
signs of overheating etc. on the PCB... 
 OK, I admit that was only for VISIBLE SIGNS. The LM2577-T12 (switching
 voltage regulator in TO-220 package) next to the AUI port becomes TERRIBLY hot
...
  even after < 10 minutes of running the printer.
 I assume it's used to generate the voltage the Transceiver uses? But the
 power light (on the transceiver) is on as long as the printer is... 
That may not be a problem.  The external transceiver (and the internal one)
use an isolated supply to drive the electronics on the cable side.  Those
little converters sometimes get warm.  I'm not familiar with that specific
chip, though.  It probably shouldn't get very hot.

...
  And even worse...the DATA LED does no longer blink
when there's traffic on
...
  the Ethernet... 
Oh dear, a bad sign, I fear.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York