| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
Hi, I have a customer with a 1km fibre link which doesn't work with a 90FA, but does work when the 90FA is replaced with a Cabletron Hub. this is all the information I've been given. Where should I start looking ? \Ryan
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2810.1 | Cabletron's fibre may be proprietary.... | NETCAD::BATTERSBY | Fri Sep 29 1995 10:12 | 6 | |
I think I recall someone mentioning in here that Cabletron's
fibre interface is a proprietary implementation and may not
be 10baseFL/FOIRL compatible. I'll have to do a search to find
that note, but that's my hunch.
Bob
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| 2810.2 | Note topic 2626 has discussion about Cabletron's 10baseFB | NETCAD::BATTERSBY | Fri Sep 29 1995 10:49 | 7 | |
Ok I found it. Read base note 2626 and all of its replies.
Cabletron does apparently have some products which use a
different fibre standard than 10baseFL. This other standard
is 10baseFB, and is incompatible with 10baseFL. So perhaps this
is what is going on with the situation described in the base note.
Bob
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| 2810.3 | MSDOA::REED | John Reed @CBO = Network Services | Sun Oct 01 1995 19:03 | 27 | |
I would also look to see what type of hardware is on BOTH sides of the
optical link. The Digital 10BaseFL product suite works very nicely
over 1km links.
a) Check to insure that you don't have a hardware
failure, by jumpering the transmit to it's own receive port, and look
for a LOT of LED activity. This is not a valid config, and you will
see too many collisions, but it will tell you that the fiber receiver
and transmitter in the module are both working. Disconnect the jumper
quickly.
b) Check that you don't have a fiber problem, by doing the same thing
using the customers fiber optic cable plant. Loop one end, and put the
10BaseFL device on the other, (now a 2km link). You should STILL see a
collision, and lots of LED activity, cause the light loss of newer
fiber is pretty low. This is also an invalid config, and should not be
left connected for more than a few seconds of testing. It will
interfere with traffic on your LAN.
If these tests work for BOTH devices on both sides of the fiber link,
then the devices themselves work, but are just incompatible. Post the
exact part numbers of the equipment on each side, and maybe that will
give us a clue.
JR
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| 2810.4 | thanks | JOBURG::RYAN | Ryan Price, 756-4336 | Tue Oct 03 1995 05:27 | 5 |
Thanks, will get back to you guys later. \Ryan | |||||