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Cisco 1760 Quick Start Manual page 27

Modular access router cabling and installation
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Figure 22
A Network Using ISDN BRI Voice Interfaces
Router A: Cisco 1760
BRI NT
interface
PBX
Configuring the BRI Layer 1
At the BRI Layer 1, you can configure each port of the VIC to operate in NT (clock source) or TE (clock slave) mode by using
the IOS isdn layer1-emulate command in interface configuration mode:
isdn layer1-emulate {network | user}
where network enables the VIC to operate in the NT mode, and user enables it to operate in the TE mode. The default setting
for each port is the TE mode.
Configuring the ISDN Protocol
Depending on your ISDN switch type, the Layer 2 protocol may be configured to operate in NT or TE mode. To do this, use
the isdn protocol-emulate command in interface configuration mode:
isdn protocol-emulate {network | user}
where network enables the ISDN Layer 2 to operate in the NT mode, and user enables it to operate in the TE mode. The default
setting is the TE mode.
The configurations of Layer 1 and Layer 2 are independent of each other. For example, you can set the Layer 1 operating
Note
mode to NT and set the Layer 2 to TE.
Turning the Line Power On/Off
To control the line power (phantom power only) being supplied to a connected device, use the line_power command in interface
configuration mode:
line_power
no line_power
The line_power and no line_power commands are valid only for a BRI port operating in NT mode. If a port is equipped with
hardware to supply line power, using these commands will activate or deactivate line power provision from that port.
Setting the Network Clock Priority
If a port is operating in TE mode, you can set the clock priority for that port. The clock priority determines whether the external
clock on the ISDN line or the internal clock on the system board takes control. To change the clock priority, use the
network-clock-priority command in interface configuration mode:
network-clock-priority {high | low}
Router B: Cisco 1760
WAN/IP
Network
BRI TE
interface
PSTN
27

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