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.
Regards,
Dennis
> -----Original Message-----
> From: Steve Lang [mailto:steve.lang(a)attica.co.nz]
> Sent: Friday, November 26, 1999 4:51 PM
> To: Dennis Su; nznog(a)list.waikato.ac.nz
> Subject: RE: a channelized E1 problem
>
>
> Hiya Dennis.
>
> > We are having a mysterious problem with a channelized E1. I am
> > wondering if
> > 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
> > seems that
> > the router is not talking to NTU at all. I have listed the router
> > config and
> > the output of show controller etc. The IOS is 11.3(3).
>
> Hmmm. My suspicion would be NTU Config. Perhaps the NTU isn't
> speaking CRC4
> 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
> cryptic menuing
> system, inlcuding possibly the linecode as well.
>
> The other thing that I've seen before is that the correct
> timeslots aren't
> 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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