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List: cisco-nsp
Subject: [c-nsp] ARD signalling (for trading turret systems)
From: Dave Temkin <dave () ordinaryworld ! com>
Date: 2004-10-29 14:57:24
Message-ID: Pine.LNX.4.58.0410291049460.30726 () ordinaryworld ! com
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Has anyone else attempted to port TDM ARD's over an IP network? I'm
currently working on a project to do so, and I'm finding that Cisco
doesn't support PLAR signalling (not to be confused with the PLAR
connection mode).
PLAR signalling is akin to FXS/FXO/E&M (the signalling bits are actually
the exact inverse of E&M). Right now for the ones I've set up I've had
to do this kludge on every voice port:
voice-port 4/0:1
condition tx-a-bit invert
condition tx-b-bit invert
condition tx-c-bit invert
condition tx-d-bit invert
condition rx-a-bit invert
condition rx-b-bit invert
condition rx-c-bit invert
condition rx-d-bit invert
connection plar 54107
controller T1 4/0
ds0-group 1 timeslots 2 type e&m-immediate-start
The other issue here is DSP resources. PLAR signalling has a nasty habit
- the bits for PLAR look like this:
0000 = Ringing or off-hook
1111 = On hook
So, when a T1 goes down, every single channel on that T1 starts ringing.
Not pretty. It also will consume every DSP resource in an oversubscribed
router causing blocking.
I know we could go back to FXS/FXO for each of these but it's always a
hassle because the carriers get the two confused when delivering circuits
and it's a pain to get it corrected.
Just curious to know what others in the industry are doing.
Thanks,
-Dave
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