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New Member

E1 slips question.

Hi,

We have a Cisco 3845 connected to a ACD (Aspect) with several E1s.

My question is around slips, i`ve noticed the following :

E1 1/0 is up.

Applique type is Channelized E1 - balanced

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20071011, FPGA: 255, spm_count = 0

Framing is CRC4, Line Code is HDB3, Clock Source is Line.

Current port master clock:recovered from backplane

Data in current interval (256 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

23 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

23 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,

7807 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,

7807 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

So there are several slips in a short time period but I don`t know what impact that is having if at all from a end user perspective ( dropped calls ? poor quality )

Also in regards external clocking the Cisco router is configured for line ( External ) and doesn`t have any carrier E1`s connected.

Should I be arranging such a connection to clock with in the ACD & Gateway or are these number`s minimal ?

Or should I experiment and change clock on the gateway to internal to see if its any worse or better ? I assume doing this would be dependent on the ACD being configured in such a way also.

I`m new to the voice world so thanks for any advice forthcoming !

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

Re: E1 slips question.

Hi,

I don't know much about MGCP but my understanding is that clocking is configured exclusively at router level, either under controller T1/E1, or with the network-clock commands mentioned above.

7 REPLIES
Hall of Fame Super Gold

Re: E1 slips question.

Hi,

configure:

network-clock-participate wic 1

network-clock-select 1 E1 1/0

optionally, also configure network-clock-select for the other circuits with a lower priority.

Slips will go away and problem solved.

Note the router also does an excellent ACD job for when you want to commission the device currently used.

Please rate post if it helps!

New Member

Re: E1 slips question.

Hi - thanks for the quick reply.

So I have the command :

network-clock-participate slot 1

network-clock-participate slot 2

already configured.

as its using NM`s with onboard E1 and WICs plugged in...

Even though Im using External clock source in CM, I still need to use the other (network-clock-select 1 E1 1/0) command to actually enable it against a E1 ?

Thanks again

Hall of Fame Super Gold

Re: E1 slips question.

Yes, as indicated before, configure network-clock-select to eliminate slips.

Note the CM itself has no notion of clock as it is purely an ethernet device.

As an appreciation to those providing answers, please rate useful posts with the scrollbox below.

New Member

Re: E1 slips question.

Hi,

Thanks ill give that a try. I appreciate CM itself has no concept of clocking however we`re using MGCP controlled gateways so some of the clock config is completed there.

Regards

Hall of Fame Super Gold

Re: E1 slips question.

Hi,

I don't know much about MGCP but my understanding is that clocking is configured exclusively at router level, either under controller T1/E1, or with the network-clock commands mentioned above.

New Member

Re: E1 slips question.

Hi,

Yes this part of the clocking Ive completed on the CLI & has worked a treat. No slips. Fantastic. Thanks for your help.

Regards

Hall of Fame Super Gold

Re: E1 slips question.

Thanks for the appreciation and good luck!

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