[c-nsp] Multiple E1s on 2821

[David Freedman]

Peter Hicks wrote:
> All,
> 
> We have three E1 voice circuits on a 2821 - two from the same provider
> on on E1 0/0/0 and E1 0/0/1, and a third from a different provider on a
> E1 0/1/0 - a separate VIC.
> 
> After fixing a broken fan on the router, the third E1 is experiencing
> slip seconds.  The other two are clean, and I suspect this is due to the
> router being configure to use the clock from E1 0/0/0.  There is no loss
> of service, however I'm keen to sort out this problem as it might affect
> service in the future.
> 
> How can I resolve the problem?  Is it possible to use a different clock
> for each VIC?

I believe so, you probably want to

"network-clock-select <pri x> e1 0/0/0"
(set e1 0/0/0 as the "network clock" at pri x)

then

"network-clock-participate slot 0/1"

The documentation says of the priority:

"
Selection priority for the clock source (1 is the highest priority). The
clock with the highest priority is selected to drive the system
time-division-multiplexing (TDM) clocks. When the higher-priority clock
source fails, the next-higher-priority clock source is selected. Ranges
are as follows:

•Cisco 2600 series: 1 to 4

•Cisco 3660: 1 to 8

•Cisco 2800 series: 1 to 8"

Check
http://www.cisco.com/en/US/docs/ios/voice/command/reference/vr_n1.html#wp1031296

for more information.

Dave.


> 
> Regards,
> 
> 
> Peter
> 
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-- 


David Freedman
Group Network Engineering
Claranet Group