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channel-group  timeslots on cisco 1721 router

Posted on 2009-04-30
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What does this config on router exactly mean (Cisco 1721 router)

Controller E1 1/0
 framing NO-CRC4
 channel-group 1 timeslots 1-2
 channel-group 2 timeslots 5-6
 channel-group 3 timeslots 9
 channel-group 4 timeslots 11
 channel-group 5 timeslots 13
 channel-group 6 timeslots 15
 channel-group 7 timeslots 17
 channel-group 8 timeslots 19
 channel-group 9 timeslots 21
 channel-group 10 timeslots 23-24
 channel-group 11 timeslots 26
 channel-group 12 timeslots 29

please explain
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Question by:jacksch4820
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Expert Comment

by:Don Johnston
ID: 24272563
A timeslot is equal to 64kb of bandwidth.

These commands create one channel-group (basically an interface) with 128kb of bandwidth. A second channel-group with 128kb. A third with only 64kb and so on.

You can then use these channel-groups

int e1/0:1
 ip address 192.168.1.1 255.255.255.0
 bandwidth 128
int e1/0:2
  ip address 192.168.2.1 255.255.255.0
  bandwidth 128
 int e1/0:3
  ip address 192.168.3.1 255.255.255.0
  bandwidth 64
 int e1/0:4
  ip address 192.168.4.1 255.255.255.0
  bandwidth 64
 
etc., etc., etc.


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Author Comment

by:jacksch4820
ID: 24283651
Thanks for feedback what are advantages of creating channel groups timeslots
Please explain
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Expert Comment

by:Don Johnston
ID: 24283682
On a router, you could use it to create different interfaces for different traffic types.
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Author Comment

by:jacksch4820
ID: 24283709
timeslots 1-2 what does the number mean
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Expert Comment

by:Don Johnston
ID: 24283742
A T1 has 24 64kb timeslots (total is 1.544mbps). An E1 has 30 timeslots. Timeslots 1-2 would be used to create a channel-group of 2 timeslots (1 & 2) for a total of 128kbps.
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Author Comment

by:jacksch4820
ID: 24285738
what is this command meaning on router

Controller E1 1/0
 framing NO-CRC4
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Don Johnston earned 1500 total points
ID: 24285848
E1 circuits can use CRC for error checking or not. The "no-crc4" command turns it off.
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