08-03-2014 02:39 PM - edited 03-16-2019 11:36 PM
Hi All - WE have VG with WIC Card E1/T1 with two slots (0/0/0 and 0/0/1) and we are planning to configure ISDN PRI Line (E1 - CCS) from two different service provider.
Is that possible to configure two different service provider in the same WIC Module which has two slots, Since DSP card of the Module will sync with two different time? will it cause clock slip on the VG.
Solved! Go to Solution.
08-23-2014 07:57 AM
Hi Siva,
If you use the below command then that can be achieved.
clock source line independent
Please see below for reference:
http://www.cisco.com/c/en/us/support/docs/routers/3600-series-multiservice-platforms/8106-vwicmf-t1.html
Thanks
DJ
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08-05-2014 10:56 AM
Hi,
This will cause problems for sure as we cannot take clock from 2 sources on the same T1/E1 card.
It will certainly lead on slip and error seconds on the router.
Thanks
DJ
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08-07-2014 12:39 PM
Hi Jan and DJ - Thanks for your response, In this case it is not possible to make such configuration to work. If so what is the alternate solution without going for different WIC slot.
Thanks,
Siva
08-08-2014 05:09 AM
Hi Siva,
All right. And why is not possible to configure both E1/T1s and what kind of problem did you see ?
cheers,
Jan
08-08-2014 05:49 AM
Hi Jan - We are in Design Phase before going for implemetation i just want to makesure if its possible to have two different Service Provider in the same WIC slot where it shouldnot run in to any problem like clock slip etc..
Thanks,
Siva
08-08-2014 05:53 AM
Hi Siva,
There wil be slip and error seconds on the setup as the backplane can only take clock from one of the line (source) at a time.
This will lead to sync issues.
There is no alternate way for this and also slip errors may lead to problems like audio quality, delay etc.
Thanks
DJ
08-08-2014 06:55 AM
Hi Siva & DJ,
Possible you're a bit _too_ paranoia about the synchronisation. As written before: if you have tons and tons of slip secs, you might have a problem with voice quality over the E1/T1 but that would mean that the TSP has a problem in the first place. Their clocks don't drift that much unless they take their clock from an obscure source. If you have a couple of slip secs, you will not even notice.
The below snippit is from a production router, running 46 weeks in a row, E1 0/0/0 and 0/0/1 run the same WIC and take their clock from 2 different service providers:
#sho control E1 | i (up|down|Desc|Slip)
E1 0/0/0 is up.
Description: towards SPA 1
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
E1 0/0/1 is up.
Description: towards SPB 1
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
E1 0/1/0 is up.
Description: towards SPB 2
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
[..]
WIC Slot 0:
VWIC2-2MFT-T1/E1 - 2-Port RJ-48 Multiflex Trunk - T1/E1
Hardware Revision : 0.0
Top Assy. Part Number : 800-22629-05
Board Revision : C0
Deviation Number : 0
Fab Version : 04
PCB Serial Number : <removed>
RMA Test History : 00
RMA Number : 0-0-0-0
RMA History : 00
Product (FRU) Number : VWIC2-2MFT-T1/E1
These 3 E1's carry around 200 voice calls per hour without problem. I wouldn't worry too much
cheers,
jan
08-06-2014 01:07 AM
Hi,
Yes, you're correct that it _might_ lead to clock slip errors but that does not mean that the configuration/set-up wil not work!
In the end if the voice gateway has two E1 connections on one WIC or different WICs or different NMs, it will need to synchronise it's clock to one. And thus the "danger" of clock slips is always existent when two or more E1/T1s are being used. That being written, don't forget that service providers usually synchronise their clock from a reliable source:
they're sort of foreced to do so when they interconnect...
Although, you might see some slip seconds it should not stop your from using such a configuration. If the amount of clock slip seconds is astronomically high, the service provider has problem, don't you think so?
cheers,
jan
08-23-2014 07:57 AM
Hi Siva,
If you use the below command then that can be achieved.
clock source line independent
Please see below for reference:
http://www.cisco.com/c/en/us/support/docs/routers/3600-series-multiservice-platforms/8106-vwicmf-t1.html
Thanks
DJ
**Please rate useful posts**
08-23-2014 12:01 PM
Thank you so much for the info.
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