[cisco-voip] Troubleshooting ISDN PRI alternating between TEI_ASSIGNED and AWAITING_ESTABLISHMENT

[Jonathan Charles]

Layer 1 is fine.

So, we have either a layer 2 or 3 issue.

Now, a quick primer on connectivity to the ISDN switch.

Your Router is connected, via layer 1, from the WIC, to a Smartjack (the
thingy on the wall at the premise), the T1 carrier brings layer 1 to the
telephone company's Central Office (with repeaters in the middle) into a
Digital Access Cross Connect (aka a DACS, commercially known as a Titan)...
from there, your PRI is demultiplexed (or multiplexed, depending on whether
the telco is agregating T1s) over to a local type 4 (or 5) switch, or
trunked to another Central Office.

Based on the output you have sent, we know that we are fine all the way to
the DACS (otherwise we would see errors on the controller).

Since we are seeing no slips, we also know that we are getting good clock
from the ISDN switch itself.

What we are not seeing is any reply from the ISDN switch (hence the "user TX
-> SABMEp sapi=0 tei=0" but no " User RX <- RRf sapi=0 tei=0 nr=32" or
similar)

So, the problem is on the ISDN switch itself. Either it has no idea what you
are talking about (wrong switch-type, which is unlikely since it used to
work).

Engage the carrier and escalate hourly.




Jonathan

On 11/21/06, Robert Kulagowski <bob at smalltime.com> wrote:
>
> Jonathan Charles wrote:
> > I would start by checking the t1 controller for errors, is it up, etc.
>
> T1 0/2/0 is up.
>    Applique type is Channelized T1
>    Cablelength is long gain36 0db
>    No alarms detected.
>    alarm-trigger is not set
>    Soaking time: 3, Clearance time: 10
>    AIS State:Clear  LOS State:Clear  LOF State:Clear
>    Version info Firmware: 20060711, FPGA: 13, spm_count = 0
>    Framing is ESF, Line Code is B8ZS, Clock Source is Line.
>    CRC Threshold is 320. Reported from firmware  is 320.
>    Data in current interval (208 seconds elapsed):
>       0 Line Code Violations, 0 Path Code Violations
>       0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
>       0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail
> Secs
>    Total Data (last 24 hours)
>       0 Line Code Violations, 0 Path Code Violations,
>       0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
>       0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail
> Secs
>
> Currently configuring SIP, so no H.323 or MGCP.
>
> deb isdn standard is showing essentially the same thing as I pasted in
> my first email.
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://puck.nether.net/pipermail/cisco-voip/attachments/20061121/6e508d17/attachment.html