Configuring Timing (Clock) Signals
Note Cisco IOS Release 11.2(7a)P or later, or 11.1(10)CA or later loaded on your Cisco 7200 series, Cisco 7000 series, or Cisco 7500 series router with a
Cisco IOS Release 12.0(3)T or later, or 12.0(1)XE or later support nonstandard clock rates on
Cisco IOS Release 11.3(6)NA or later loaded on your Cisco uBR7200 series router supports nonstandard clock rates (any value from 1200 to 8000000) on
Nonstandard clock rates are rounded (if necessary) to the nearest clock rate that the hardware can support
The following example shows how to configure a nonstandard clock rate on a
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 1/0
%Clockrate rounded to nearest value that your hardware can support. %Use Exec Command ‘show
Router(config)#
The following example shows how to configure a nonstandard clock rate on a
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z. Router(config)# interface serial 3/1/0
%Clockrate rounded to nearest value that your hardware can support. %Use Exec Command ‘show
Router(config)#
The following example shows how to determine the exact clock rate that the interface was rounded to by using the show
Router# show
Building configuration...
...
!
interface Serial 1/0
no ip address
clockrate 1151526
!
...
Inverting the Clock Signal
Systems that use long cables or cables that are not transmitting the TxC (clock) signal might experience high error rates when operating at higher transmission speeds. If a