Cisco MC3810-APM-FXO= Datasheet download pdf (Page 39)

Configuring Voice Ports

Configuring Digital Voice Ports

VC-73

Cisco IOS Voice, Video, and Fax Configuration Guide

Step 4

Router(config-controller)# clock source {line [primary

| secondary] | internal}

Configures the clock source.

The keywords and arguments are as follows:

• line—Specifies that the PLL on this port

derives clocking from the external source to

which the port is connected (generally the

CO).

• primary—(Optional) Specifies that the PLL

on this port derives clocking from the external

source and puts the other port (generally

connected to the PBX) into looped-time

mode. Both ports are configured with line,but

only the port connected to the external source

is configured with primary.

• secondary—(Optional) Indicates a backup

external source for clocking if the primary

clocking shuts down. Configure the clock

source line secondary command on the

controller that has the next-best-known

clocking.

• internal—(Optional) Specifies that the clock

is generated from the voice port’s internal

PLL.

For more information about clock sources, see the

“Clock Sources on Digital T1/E1 Voice Ports”

section on page 66.

The default is line.

Step 5

T1 lines

Router(config-controller)# linecode {ami | b8zs}

E1 lines

Router(config-controller)# linecode {ami | hdb3}

Specifies the line encoding to use.

The keywords are as follows:

• ami—Specifies the alternate mark inversion

(AMI) line code type. (T1 and E1)

• b8zs—Specifies the binary 8 zero substitution

(B8ZS) line code type. (T1 only)

• hdb3—Specifies the high-density bipolar 3

(HDB3) line code type. (E1 only)

The default for T1 is ami.

The default for E1 is hdb3.

Command Purpose

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Cisco MC3810-APM-FXO= Datasheet Page 39

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