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Configuring an Unchannelized T3 Link
Specifying the Cable Length for the Serial Interface
At the prompt, specify the cable length using the cablelength feet interface command where:
•
•
An example follows:
Router(config-if)# cablelength 40
Note
For the cablelength feet command, user-specified T3 cable lengths are structured into ranges as follows:
0–49 and 50–450 to represent short and long cables.
If the numerical value entered by the user falls within the lower range, then the PA-MC-T3-EC
T3 port is set for short cable output levels. If the value falls into higher range, the long cable output levels
will be used.
In the preceding example, a cable length of 40 is specified, which means that the 0–49 range is used. If
you change the cable length to 45, then the 0–49 range still applies. Further, if you specify a cable length
of 100 or 200, the 50–450 range applies in both cases. Only moving from one range (0–49) to the other
range (50–450) has an effect. The actual cable-length number you enter is stored in the configuration
file. It is recommended that the actual cable length be entered to ensure future compatibility.
Setting the Clock Source for the Serial Interface
At the prompt, set the internal or line clock source for the selected T3 controller with theclock source
{line | internal} interface command where:
•
•
The default is clock source internal.
Examples follow:
•
•
PA-MC-T3-EC Port Adapter Installation and Configuration
4-6
feet is a numeral from 0 to 450.
The default value is 10 feet.
line selects a network clock source.
internal selects an internal clock source.
Instruct the PA-MC-T3-EC to use a line clock source.
The example that follows is for a port adapter in slot 1 of a Cisco 7200 VXR router:
Router(config)# interface serial 1/0
Router(config-if)# clock source line
Instruct the PA-MC-T3-EC to use an internal clock source.
The example that follows is for a port adapter in slot 1 of a Cisco 7200 VXR router:
Router(config)# interface serial 1/0
Router(config-if)# clock source internal
Chapter 4
Configuring the Unchannelized Mode
OL-10589-02
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