| Author |
E1 Timeslots with ISDN PRI
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| Dillon 2001-04-29, 5:24 am |
| Some confusion arising from the number of bearer channels resulting from the pri-group timeslots 1-30 command. This is the configuration that I have found in the BCRAN exam guides but when viewing the serial subinterfaces they are numbered s1/0:0-29 with one (s1/0:15) being the D channel. Is it just me or is this only 29 bearers instead of the 30 that are described in the specification. Surely the command to configure the E1 controller should be pri-group timeslots 1-31?
Dillon  | |
| SpeakEasy 2001-04-29, 5:34 am |
| yup you're right, according to the BCRAN coursebook page 216, the timeslot argument for the pri-group command would be 1-31, and the interface command would be 0/0:15 ! | |
| Dillon 2001-04-29, 5:39 am |
| Thanks for the help!
I've got 3 ISDN PRI lines at work on three seperate 2600 routers. Two of them have let me change the pri-group timeslots command to 1-31 on the fly & it does give me the required number of bearers. However one of them is being a bit more stubborn & disconnects any connected lines when I try & change this command. I have even shut the serial interface down first but still no luck. Any ideas?
Dillon  | |
| SpeakEasy 2001-04-29, 5:51 am |
| try the following commands to troubleshoot.
debug isdn event
debug isdn q921 - layer 2 signaling
debug isdn q931 - layer 3 signaling
dont use all at once as the output will be intermingled....if you can get it working, - brief us!
HTH....
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| SpeakEasy 2001-04-30, 9:12 am |
| Dillon,
Did you manage to get it working? and how!
- always willing to learn... | |
| gledbe 2001-04-30, 11:09 am |
| Remember, you must count the zero. | |
| Dillon 2001-04-30, 1:26 pm |
| SpeakEasy, as I said in the earlier post I managed to change the command on two out of three of our ISDN PRI 2600's to 'pri-group timeslots 1-31'. This has given me the 31 serial subinterfaces numbered s1/0:0-30. The D channel is S1/0:15 as we already know, leaving 30 bearers as required. So this must be correct & not 1-30 as described in the books & on cisco's web site.
Unfortunately I am still having trouble with one of them which will not let me change the syntax of the timeslots command from 1-30 to 1-31. This is strange as the router has the same spec & IOS level as the others.
Dillon  |
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