We've had a lot of trouble upgrading one of our links to 2Mbit today,
which started when our dutch telco messed up the CPU board in our
multiplexer. Which took them nearly 8 hours to repair, and giving us only
a 1920Kbit stream/V.35.
Now did I think that that would not matter since this is SYNC traffic and
it is self-clocking. (A PM does take a 144Kbit stream from one of our
baseband modems). But our experience seems to indicate otherwise.
The ISP on the other side has a CISCO, and the connection work flawless at
1 Mbit.
What we noticed is that at 2 Mbit the irx spews out a lot of
LCP_REQUEST_CONFIG
And only once of about every 15-20 something is received back from the
CISCO. What the CISCO sends is correctly recognised by the IRX as being
again an LCP_REQUEST_CONFIG.
Once in a while the IRX tell us that it is reset it's DMA???
We got lots of aborts on the serial port, but few CRC's and or Frame errors.
My conclusions is that both systems don't realy understand one another
probably 'cause the very basic layer is not working correctly.
But I'm to understand that the IRX should be able to do atleast 2Mbit on
1 port without getting into trouble?
- So what are we getting?
- Is the system overloaded?
- Doesn't it take 1920K, which BTW is shown as 2048K external clocked
with the newest COMOS software release?
- The Telco person mumbled something that the signal had it perhaps
clock-flanks reversed, and he had to switch his tester.
Could and IRX be succeptible to this?
Problem is that testing this again is not very easy, not unless we get our
second feed up. But that's again 2Mbit which we were going to do with IRX's
and BGP. Testing might occur during off hours: 3 at night or so.
We've now used a CISCO 2501 which does not see any sort of problems
and is taking the traffic oke but it will not do BGP as we would like it to
do: 2 full feeds.
Does anybody have suggestions on how to tackle this?
Other that buy more CISCO's?
Thx,
Willem Jan
-- Internet Access Eindhoven BV., voice: +31-40-2468500, data: +31-40-2439436 P.O. 928, 5600 AX Eindhoven, The Netherlands Full Internet connectivity for only fl 12.95 a month. Call now, and login as 'new'.