Datasheet

Installing 2T16S Network Processor Modules in the Cisco 4000 Series

78-3277-03

Step 2 Select the serial interface to configure:

Router(config)# interface serial 2

Router(config-if)#

The prompt changes again to show that you are in interface configuration mode.

Note The serial interface numbers for the low-speed ports can be 2 to 17 or 20 to 35 as previously

described in Table 1.

Step 3 Because all serial ports are initially configured as synchronous, you must change the port to

asynchronous operation by entering the physical-layer command:

Router(config-if)# physical-layer async

Configure other asynchronous parameters according to your needs, for example:

Router(config-if)# async mode dedicated

Router(config-if)# async default routing

Step 4 To configure asynchronous line settings, use the line async command. A serial port’s line number is

related to its slot number and unit number in the following way:

line-number = (16 x slot-number) + unit-number + 1

For example, serial port 1/2 corresponds to line number (16 x 1) + 2 + 1 = 19. To set this port to a speed

of 115200 bps, you would enter the following commands:

Router(config-if)# line async 2

Router(config-if)# speed 115200

Note Future releases of Cisco IOS will support automatic line configuration. Existing asynchronous

ports will be renumbered according to a different line numbering convention.

To return an asynchronous port to synchronous operation, use the configuration mode physical-layer

sync command.

Step 5 If you have completed the configuration, press Ctrl-Z to exit configuration mode and then write the new

configuration to memory, as follows:

Router(config-if)# ctrl z

Router# copy running-config startup-config

The system displays a confirmation message when the configuration is saved.

Note For older versions of software, use the write mem command to write the new configuration to

memory.

Step 6 Enter the disable command to return to the user level:

Router# disable

Router>

Step 7 Enter the show commands to check the configuration of the interface.