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Cisco 2620 - line command to open up line speed

I have a Cisco 2620 that I need to change the parameters to open up the pipeline. Our Network Admin has left the

company and left no documentation. I now need to open up our speed connection from fractional to full T1 speeds.

1 ACCEPTED SOLUTION

Accepted Solutions
Gold

Re: Cisco 2620 - line command to open up line speed

Assuming this is a point-to-point connection and you have an internal T1 DSU/CSU WIC, the first thing you want to do is figure out how the DSU/CSU is configured now. Run the "show service-module" command and copy/save this information. You will see something like this:

Cisco2620XM#show service-module serial 0/0

Module type is T1/fractional

Hardware revision is 0.128, Software revision is 0.2,

Image checksum is 0x73D70058, Protocol revision is 0.1

Receiver has no alarms.

Framing is ESF, Line Code is B8ZS, Current clock source is line,

Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.

Last module self-test (done at startup): Passed

Last clearing of alarm counters 9w0d

loss of signal : 0,

loss of frame : 0,

AIS alarm : 0,

Remote alarm : 1, last occurred 9w0d

Module access errors : 0,

Total Data (last 96 15 minute intervals):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 2 Degraded Mins

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

Data in current interval (408 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

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

Cisco2620XM#

Note that this information is from a full T1. If you are running a true fractional T1 connection, then the number of timeslots used will be less than 24 and your net bandwidth will be less than 1536 Kbits/sec.

If you need to increase the number of timeslots, go into config mode and enter the following:

interface serial 0/0

service-module t1 timeslots 1-24 speed 64

end

Don't forget to save your configuration ("write memory" or "copy running-config startup-config").

A helpful link:

Use WIC-1DSU-T1 Interface Cards on Cisco 1600, 1700, 2600, 3600 and 3700 Series Routers

http://www.cisco.com/en/US/products/hw/modules/ps3129/products_tech_note09186a0080093d70.shtml

You should plan and coordinate activation with your service provider ahead of time, so they can enable the additional channels on the line while you configure the timeslots on the router.

Another note: if you have a Frame Relay T1 (if you see "encapsulation frame-relay" under your serial interface's configuration), then you may have a full T1 access link but only a sub-T1 Committed Information Rate (CIR) across that connection. In this case, you need to work with your service provider to either increase the CIR on your Permanent Virtual Circuit (PVC), or convert the link to a dedicated point-to-point full T1 leased line.

2 REPLIES
Gold

Re: Cisco 2620 - line command to open up line speed

Assuming this is a point-to-point connection and you have an internal T1 DSU/CSU WIC, the first thing you want to do is figure out how the DSU/CSU is configured now. Run the "show service-module" command and copy/save this information. You will see something like this:

Cisco2620XM#show service-module serial 0/0

Module type is T1/fractional

Hardware revision is 0.128, Software revision is 0.2,

Image checksum is 0x73D70058, Protocol revision is 0.1

Receiver has no alarms.

Framing is ESF, Line Code is B8ZS, Current clock source is line,

Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.

Last module self-test (done at startup): Passed

Last clearing of alarm counters 9w0d

loss of signal : 0,

loss of frame : 0,

AIS alarm : 0,

Remote alarm : 1, last occurred 9w0d

Module access errors : 0,

Total Data (last 96 15 minute intervals):

0 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 2 Degraded Mins

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

Data in current interval (408 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

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

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

Cisco2620XM#

Note that this information is from a full T1. If you are running a true fractional T1 connection, then the number of timeslots used will be less than 24 and your net bandwidth will be less than 1536 Kbits/sec.

If you need to increase the number of timeslots, go into config mode and enter the following:

interface serial 0/0

service-module t1 timeslots 1-24 speed 64

end

Don't forget to save your configuration ("write memory" or "copy running-config startup-config").

A helpful link:

Use WIC-1DSU-T1 Interface Cards on Cisco 1600, 1700, 2600, 3600 and 3700 Series Routers

http://www.cisco.com/en/US/products/hw/modules/ps3129/products_tech_note09186a0080093d70.shtml

You should plan and coordinate activation with your service provider ahead of time, so they can enable the additional channels on the line while you configure the timeslots on the router.

Another note: if you have a Frame Relay T1 (if you see "encapsulation frame-relay" under your serial interface's configuration), then you may have a full T1 access link but only a sub-T1 Committed Information Rate (CIR) across that connection. In this case, you need to work with your service provider to either increase the CIR on your Permanent Virtual Circuit (PVC), or convert the link to a dedicated point-to-point full T1 leased line.

New Member

Re: Cisco 2620 - line command to open up line speed

Thank you for your quick feedback - so far so good. Your detailed information was great. I just wish we had more professionals like yourself that would be more specific in their support. You made so easy to do. Thank you again for your help and professionalism.

Moses

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