Cisco 1760 Quick Start Manual page 28

Modular access router cabling and installation

Hardware installation manual (112 pages)

User manual (48 pages)

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where high enables the external clock, and low enables the internal clock to drive the VIC. By default, the clock priority is set

to high.

Note

If the VIC loses its external clock source, as when the ISDN line is down, the internal clock source takes over until the

external clock is functioning again.

Configuration Example

To configure each BRI interface, follow these steps, starting in privileged user mode.

Before you configure each port on the VIC, verify that the BRI interface has shut down and that the cable to the

Note

connected device is properly installed for the operating mode of the interface that you plan to configure.

Command

Step 1

router# configure terminal

Step 2

router(config)# isdn switch-type basic-net3

Step 3

router(config)# interface bri 0/0

router(config-if)# no ip address

Step 4

router(config-if)# isdn incoming-voice

Step 5

{voice | modem | data}

router(config-if)# shutdown

Step 6

router(config-if)# isdn layer1-emulate {user | network}

router(config-if)# no shutdown

router(config-if)# network-clock-priority {low | high}

Step 7

router(config-if)# line-power

Step 8

Step 9

router(config-if)# isdn protocol-emulate {user | network}

Step 10

router(config-if)# end

Description

Enter the global configuration mode.

Specify the ISDN switch type.

The only switch type supported is the

Note

basic-net3.

Change to interface configuration mode for port 0

in slot 0.

Specify that there is no IP address for this interface.

Configure this port for incoming calls.

Shut down the interface. Then configure the Layer

1 port mode and clock settings:

• Enter user to configure the port as TE, to

function as a clock slave. This is the default.

• Enter network to configure the port as NT, to

function as a clock master.

Activate the interface after you configure the port.

(Optional only for TE-configured ports.) To change

the setting for clock source priority:

• Set to high to use the external clock on the

ISDN line to drive the VIC. This is the default.

• Set to low to use the internal clock on the VIC.

(Optional only for NT-configured ports). Turn on

the power supplied from the port to a TE device.

Configure the Layer 2 port protocol emulation:

• Enter user to configure the port as TE so that

the PBX is the master. This is the default.

• Enter network to configure the port as NT so

that the PBX is the slave.

Exit configuration mode.

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Cisco 1760 Quick Start Manual page 28

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