The show controller command shows a repeating clock slip on the E1 or T1 interface, as shown in this example:
Router#show controller e1 0/0 E1 0/0 is up. Applique type is Channelized E1 - balanced No alarms detected. alarm-trigger is not set Version info Firmware: 20020812, FPGA: 11 Framing is CRC4, Line Code is HDB3, Clock Source is Line. Data in current interval (97 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 4 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 4 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs Total Data (last 14 15 minute intervals): 1 Line Code Violations, 4 Path Code Violations, 425 Slip Secs, 0 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins, 427 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
The digital errors cause the call to be dropped, or the fax transmissions to be incomplete or corrupted. The problem occurs with all fax machines.
In this example, a fax passthrough is used between a skinny-based Analog Telephone Adaptor (ATA) 186 registering with the Cisco CallManager 3.3(2). The Cisco IOS Software gateway at the other end of the VoIP network is 2621. However, this issue could apply to other situations as well.
Note: The default clocking configuration is for the digital interface to take clocking from the line. In situations such as these, where digital interfaces need to source clock across the Time-Division Multiplexing (TDM) backplane, its default clocking mode needs to be changed.
If clocking is not correctly configured, clock slips result.
To resolve the issue, perform these steps:
Issue the clock source line command under the appropriate controller. The Voice and WAN Interface Card (VWIC) controller configuration defaults to clock source line. However, the recovered clock is not used to drive the Advanced Integration Module (AIM) module. Therefore, this configuration is not sufficient to resolve the clock slip problem.
To allow the router to recover the clock from the E1 and T1 VWIC and pass it across the backplane to the AIM, issue the network-clock-participate command in global configuration mode. If multiple VWICS are installed, the command is appropriately repeated.
Specify the network clock source and priority. Issue the network-clock-select command in global configuration mode.
This an example configuration:
Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#network-clock-participate wic 0 Router(config)#network-clock-select 1 t1 0/0 Router(config)#^Z
Issue the show network-clocks command to confirm the system clocking, as shown in this example:
Router#show network-clocks Network Clock Configuration --------------------------- Priority Clock Source Clock State Clock Type 0 T1 0/0 Good T1 5 Backplane Good PLL Current Primary Clock Source --------------------------- Priority Clock Source Clock State Clock Type 0 T1 0/0 Good T1
We are utilizing CCB in our environment with CUBE and multiple and load balanced CVP/VXML (11.6). A request came to me to try to answer for CCB NOT offered per limits set on the CUBE(s) during a possible high volume experience. So far, I have not fou...
In WebUI under call control I dont see a way to pull up DTMF Tones after a call is established! Current software is tc7.3.18 The remote supports a DTMF keyboard but thats not too user friendly! I have cruised thru the admin guide and find nothin...
All, I am a Route/Switch/ Firewall Engineer that has inherited a 12.x Environment. I have a 3 node CUCM cluster, a 2 node Unity cluster and a 2 node CCXE cluster. I need some direction to good free training materials and information so I can get fami...
Want to shout out someone who has used Cisco Webex in an innovative way? Or maybe you've helped a teammate with Webex? We want to hear about it! Share your stories about the "new normal" for work here (https://www.techvalidate.com/registration/cisco-webe...
Does anyone have this problem? There must be a pin for self-view according to the User Guide and on-screen help, but I don't have one and I cannot find where it is configurable. Kind of a small problem, but it is important as it reminds that you are on vi...