Clockrate on Details... https://www.deepreflect.net/tags/clockrate/ Recent content in Clockrate on Details... Hugo en-US Copyright © 2003 - 2026 Leonardo Rizzi Tue, 30 Jun 2026 03:28:29 +0200 Cisco - ATM Clockrate https://www.deepreflect.net/2010/04/21/cisco-atm-clockrate/ Wed, 21 Apr 2010 15:09:18 +0000 http://blog.deepreflect.net/?p=915 <p>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.</p> <p>If yuo wanna check type the following command on your router:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-fallback" data-lang="fallback"><span style="display:flex;"><span>hellroute01#show controller atm0/0 | include ATM0/0 </span></span><span style="display:flex;"><span>Interface: ATM0/0, Hardware: DSLSAR (with Alcatel ADSL Module), State: up </span></span><span style="display:flex;"><span>SCC0 = 2600000 (ATM0/0) </span></span><span style="display:flex;"><span>SCC3 = 1000000 (ATM0/0) </span></span><span style="display:flex;"><span>hellroute01# </span></span></code></pre></div><p>If you get 2600000 (default value) on SCC0 or SCC1 your downlink speed rate probably is limitated at about 300 KB/s</p> 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.

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