Ascend Archive
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RE: (ASCEND) shared D-Channels on PRI
At 09:33 AM 10/15/98 , Noel Johnston wrote:
>Regards use of D-channel backup with NFAS:
>
>I saw a couple of postings indicating that loss of the D-channel with NFAS
>would bring down all the PRIs in that "group" (pardon possible lack of
>correct terminology there)
>
>We have 4 PRIs in our NFAS "group" on each of our MAX 4000s
>
>24th channel on PRI1 is set to NFAS-PRIME
>24th channel on PRI4 is set to NFAS-SECOND
>
>This leaves us 94 (24 * 4 - 2)channels for calls. If PRI1 (or its
>D-channel) is lost, signalling switches to 24th channel on PRI4.
This is part of the big picture. Many NFAS schemes only have one D-channel
for 2,3 or 4 spans - in that case, all calls get dropped period. They then
require user intervention (in most cases) before any calls onto that NFAS
group can be re-established.
In this 'backup' D-channel scheme, all calls in progress typically still get
dropped - HOWEVER, in this case they *can* be re-established immediately
without user intervention.
Kevin Smith (kevin@ascend.com)
Ascend Communications...
...where Network Solutions never end.
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