Specifications

5-10
PA-8T-V.35 Synchronous Serial Port Adapter Installation and Configuration
OL-3563-03
Chapter 5 Configuring the PA-8T-V.35 Interfaces
Configuring the Interface
Step 8 When you have included all of the configuration subcommands to complete the configuration, press
Ctrl-Z (hold down the Control key while you press Z) or enter end to exit configuration mode and
return to the EXEC command interpreter prompt.
Step 9 Write the new configuration to NVRAM as follows:
Router# copy running-config startup-config
[OK]
Router#
This completes the procedure for creating a basic configuration. Proceed to the next section,
“Configuring Timing (Clock) Signals.”
Configuring Timing (Clock) Signals
All PA-8T-V.35 interfaces support both DTE and DCE mode, depending on the mode of the interface
cable attached to the port. To use a port as a DTE interface, you need only connect a DTE compact serial
cable to the port. When the system detects the DTE mode cable, it automatically uses the external timing
signal. To use a port in DCE mode, you must connect a DCE interface cable and set the clock speed with
the clock rate configuration command. You must also set the clock rate to perform a loopback test. This
section describes how to set the clock rate on a DCE port and, if necessary, how to invert the clock to
correct a phase shift between the data and clock signals. Table 5-4 on page 5-10 summarizes some of the
commands used to configure the clock rate. See the specific sections that follow for further details.
Table 5-4 Clock Rate Configuration Commands
Purpose Command Example Additional Information
Set standard clock rate. clock rate The example is for a serial interface with a
standard clock rate of 72 kbps.
Router(config)# interface serial 3/0
Router(config-if)# clock rate 7200
“Setting the Clock Rate”
Set nonstandard clock
rate.
clock rate The example is for a serial interface with a
nonstandard clock rate of 1234567 kbps.
Router(config)# interface serial 3/0
Router(config-if)# clock rate 1234567
“Setting the Clock Rate”
Remove a clock rate that
has been set.
no clock rate The example is for a serial interface and
removes a standard clock rate of 72 kbps.
Router(config)# interface serial 3/0
Router(config-if)# clock rate 7200
Router(config-if)# no clock rate
“Setting the Clock Rate”
Invert the transmit clock
signal.
invert-txc The example inverts the transmit clock
signal for a serial interface.
Router(config)# interface serial 3/0
Router(config-if)# invert-txc
“Inverting the Clock Signal”