Cisco Systems Cisco AS5400, Cisco AS5350 quick start Dial Feature Card Ports

Dial Feature Card Ports

The TDM bus can be synchronized with any DFC cards. On the CT1/CE1 DFCs, each port receives the clock from the T1/E1 line. The CT3 DFC uses an M13 multiplexer to receive the DS1 clock. Each port on each DFC trunk slot has a default clock priority. Also, clock priority is configurable through the dial-tdm-clock priority CLI command.

External Clock

The TDM bus can be synchronized with an external clock source that can be used as an additional network reference. If no clocks are configured, the system uses a primary clock through a software-controlled default algorithm. If you want the external T1/E1 clock (via the BITs interface) as the primary clock source, you must configure it using the dial-tdm-clock priority CLI command; the external clock is never selected by default.

The BITs interface requires a T1 line composite clock reference set at 1.544 MHz and an E1 line composite clock reference set at 2.048 MHz.

Free-Running Clock

If there is no good clocking source from a DFC card or an external clock source, then select the free-running clock from the local oscillator using the dial-tdm-clock priority CLI command.

To configure the clock source and clock source priority used by the TDM bus, follow these steps:

Step 1 Use the enable command and password to enter privileged EXEC mode. You are in privileged EXEC mode when the prompt changes to Gateway#.

Gateway> enable

Password: password

Gateway#

Step 2 Enter global configuration mode. You are in global configuration mode when the prompt changes to Gateway(config)#.

Gateway# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Gateway(config)#

Step 3 Perform Step a or Step b, depending on your configuration:

a.Step a configures the CT1/CE DFC clock priority, trunk slot, and port that is providing the clocking source. Priority range is defined as a value from 1 to 99. DFC slot is defined as a value from 1 to 7. DS1 port number controller is defined as a value from 0 to 7.

Note DS1 port specifies T1 port.

Gateway(config)# dial-tdm-clock priority priority# {external freerun slot/ds1 port}

b.Step b configures the CT3 DFC clock priority, trunk slot, and port that is providing the clocking source. Priority range is defined as a value from 1 to 99.

DFC slot is defined as a value from 1 to 7. DS3 port specifies the T3 port. DS1 port number controller is defined as a value between 1 and 28.

Gateway(config)# dial-tdm-clock priority priority# {external freerun slot/ds3 port:ds1 port}

Step 4 Return to privileged EXEC mode:

Gateway(config)# Ctrl-Z

Gateway#

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