Juniper JUNOSE 10.0.X PHYSICAL LAYER, Руководство по настройке

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Optional Tasks
The following configuration tasks are optional for T3 and E3 interfaces:
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Specify the cable length (T3 only).
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Change the clock source.
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Change the framing format.
■
Enable cell scrambling (ATM interfaces only).
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Assign a text description or an alias to the interface.
cablelength
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Use to adjust the transmit power appropriate to the length of a T3 cable.
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Specify a cable length in the range 1–450 feet.
■
The router supports two transmit powers, one for a cable length between 1–225
feet and another for a cable length between 226–450 feet. Therefore, it is not
necessary to know the exact size of your cable. You only need to know if the
cable size is greater than 225 feet. For example, if your cable size exceeds 225
feet, specify any number greater than 225 and less than 451.
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Example
host1(config-controll)# cablelength 300
■
Use the no version to restore the default, 0 feet.
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See cablelength.
clock source
■
Use to configure the transmit clock source for a T3 or E3 line.
■
Use a transmit clock on the line’s receive data stream, except in rare cases such
as back-to-back router tests. When performing back-to-back router tests, configure
one end of the line as
internal and the other end as line .
■
Specify the keyword line to use a transmit clock on the line’s receive data stream.
■
Specify the keywords internal module to use the line module’s internal clock.
■
Specify the keywords internal chassis to use the router’s clock.
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Example
host1(config-controll)# clock source internal module
■
Use the no version to revert to the default, line .
■
See clock source.
description
54 ■
Configuration Tasks
JUNOSe 10.0.x Physical Layer Configuration Guide