FYI, in case someone could come across this problem again. The answer is the
pinout of NTU and router cable. We made a RJ-45 cable that cross-wires pin
1&2 to 4&5, and vice versa. It worked straightaway.
The pinouts on Cisco router and Telecom NTU are all fixed. You would think
they are pretty much standard but apparently not.
From: Steve Lang [mailto:firstname.lastname@example.org]
Sent: Friday, November 26, 1999 4:51 PM
To: Dennis Su; nznog(a)list.waikato.ac.nz
Subject: RE: a channelized E1 problem
We are having a mysterious problem with a
channelized E1. I am
you have any clue. Any input would be very much appreciated.
We have been trying to commission a new 512K leased circuit but not
successful. At the central end the NTU(CSU/DSU) is connected to a
Synchronous serial port on AS5200 via X21. At the branch
end the NTU is
connected to a Balanced Channelized E1 port on
3620 via G.703
RJ-45. We have
done loopback test and located the source of problem. It's
between the 3620
and NTU at branch. We brought back the 120-Ohm RJ-45 cable
and checked the
cable OK. And Telecom has double-checked the
circuit as well. It
the router is not talking to NTU at all. I have listed the router
the output of show controller etc. The IOS is 11.3(3).
Hmmm. My suspicion would be NTU Config. Perhaps the NTU isn't
framing? If it's a Telecom cct, then they'll possibly have an
OpenTel NTU on
it, and you can specify all sorts of things through the
system, inlcuding possibly the linecode as well.
The other thing that I've seen before is that the correct
mapped through to the x.21 card in the NTU. All things that
relate back to
the NTU, and how it's configured that may not be able to be confirmed
remotely by the Telco network management stations.
Just an idea, mind. Wouldn't be the first time I've been wrong.
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