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Cisco – ATM Clockrate

If you have performance problem on Cisco 1721, Cisco 2610XM-2651XM, Cisco 2691, and Cisco 3660, with WIC-1DSL – IOS 12.3(2) or above, probably depends on the default value associated with ALL5 clockrate.

If yuo wanna check type the following command on your router:

hellroute01#show controller atm0/0 | include ATM0/0
Interface: ATM0/0, Hardware: DSLSAR (with Alcatel ADSL Module), State: up
SCC0 = 2600000 (ATM0/0)
SCC3 = 1000000 (ATM0/0)
hellroute01#

If you get 2600000 (default value) on SCC0 or SCC1 your downlink speed rate probably is limitated at about 300 KB/s

For get full speed, put max supported value on aal5 clockrate like this:

hellroute01(config)#int atm0/0
hellroute01(config-if)#clock rate aal5 ?
1000000
1300000
1600000
2000000
2600000 (default)
3200000
4000000
5300000
7000000

<1000000-7000000> clock rates in bits per second, choose one from above

hellroute01(config-if)#clock rate aal5 7000000

Becareful the atm interface is automatically restart for apply the change. Then you lost connection on this interface.

Category: Cisco

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