On Feb 9, 21:56, Robert Schaefer wrote:
> Ooops-- I assumed you had one in front of you too. ;) The raylan is a
> 15-port managed concentrator with (currently) 10bFL hot-swap cards
> installed. Maybe concentrator is the wrong word-- that's what was used
to
> describe it to me. I was going from the tranceiver directly into the
> raylan. I'm pretty sure I had Rx & Tx right, as I got a link light on
the
> raylan, and the error on the transceiver.
Bad assumption on my part. When someone mentions "concentrator", I tend to
think of something with several places to connect AUI cables, and I assumed
that's how you'd connected them. It's basically a repeater, with it's own
transceivers (instead of just AUI) and probably management/control of
individual ports.
It ought to work, with Rx on one connected by fibre to Tx on the other, and
v.v.
> Ok. They have a three-positon DIP switch, labeled `SQE TEST', `ALTERNATE
> COLL MODE' and `FULL STEP'. Does that narrow it down?
SQE TEST is the "heartbeat" function, or Signal Quality Enable setting,
which is normally off if connecting the AUI to any kind of repeater,
otherwise on. Try it both ways.
ALTERNATE COLL MODE is to do with collision detect timing. On 3Com units
(and they bought ORnet/Chipcom) turning it on is the default, and arranges
that a single collision-presence (CI) signal is sent to the AUI interface.
If off, CI is active all the time the collision condition persists, which
is the normal setting for IEEE 802.3 compliance (the 3Com setting is an
optimisation for certain interface chips).
FULL STEP is to do with the signal sent at the beginning of a packet. HALF
STEP is normally used for 802.3 Ethernet, FULL STEP is used for DIX
Ethernet. It won't hurt to try both ways.
Another possibility is that you have the wrong type of AUI cable (old ones
use different shielding arrangements, and most "office" type cables are way
below spec) or even the wrong kind of AUI interface for this device.
Still another is that your fibre is too lossy, and the transceiver is
seeing something, but not recognising it (there's a continuous series of
pulses at 1MHz rate when it's active). Try cleaning the ends with
iso-propyl alcohol, and swap the sides over. Blow out the connectors with
dry compressed air and/or IPA.
What is the ORnet transceiver connected to?
--
Pete Peter Turnbull
Network Manager
University of York
Received on Sun Feb 10 2002 - 06:39:14 GMT