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| Tags: 11c, cisc, clocking, free, option, pri, run, switching |
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 05-01-2003, 05:16 PM | #1 (permalink) | ||||||||
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| Faxing over PRI with BCM I am a Nortel Newbie. I've been going through the books for about two weeks learning what I can. My phone support vendor and my telco vendor are both working on this issue, but have been unable to resolve it. Late last year my company moved from SBC to CBeyond. CBeyond provides us with a single t-1 that comes into a Cisco 2600 series router. This router then splits 9 channels off for voice as a PRI to a CSU/DSU that connects to the Option 11C. The remaining channels are available for data networking. When the 9 voice channels are not being used they can be used for data. Sounds like a Cisco VOIP setup of some type. The problem is that clocking has never been reliable coming from the Cisco. Currently, PREF is set to my (only) 1.5 PRI card. SREF is set to free run. The switch experiences slippage and switches to free run. If we force it to PREF, after about 30 minutes or so we lose our PRI connection. Right now we have locked it to Free Run and I get about 4 DTC105 messages an hour. I understand that these messages are normal when locked in, but also that free run is not desirable. We originally had an Eastern Research DNS1800 CSU/DSU which has been connected to the Nortel for about 7 years with no problem. We've tried several ADTRAN's (TSU 120e) and are finally using a Verilink T Lite. The Verilink is the only one that at least we can keep our PRI line up and do not lose calls. Has anyone else had experience with resolving this type of problem? Oh, we are at Release 23 Issue 35. I didn't realize it was that old till just now. | ||||||||
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| 05-02-2003, 08:44 AM | #2 (permalink) | ||||||||
| Junior Member
Location: Curitiba - PR - Brasil Rep Power: 6  | Door Phone question If you donīt have calls droped, donīt worry. DTC105 is just a information message informing the clock is in free run mode. Some kinds of configuration just work if M1 is in Free Run mode. The free run means the PBX is generating the clock, is the master, and the Cisco is the slave. Program the Primary Reference as FRUN if call working well. You can talk with the cisco technician to try other kind of configurations (with Cisco is the master and PBX is the slave), but this will probably work if the cisco have a clock source from operator, etc. The "interval" for DTC messages is set in LD 73. | ||||||||
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| 05-15-2003, 01:37 PM | #3 (permalink) |
| Junior Member | A small survey Most PBXs run with a Stratum 4 Clock. Since you have only one reference, and that too when it slips, it is definitely less reliable to be on a Free Run Mode as then the PBX would start running on a Stratum 4 Clock(Own Clock) , whereas when you take a clock from the T1 it would be a Stratum 3 clock which is more reliable. Try and get one more source or else in free run mode, you could have some slippages/crcs while TX/RX. |
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