T1-F Interface Configuration Commands; Ft1 Cable - 3Com 3C13618 Command Reference Manual

3Com Router Command Reference Guide — V1.00

3.5 T1-F Interface Configuration Commands

3.5.1 ft1 cable

Syntax
ft1 cable { long decibel | short length }
undo ft1 cable
View
T1-F interface view
Parameter
long decibel: Matches the transmission line longer than 655 feet. The argument
decibel can take 0db, -7.5db, -15db, or -22.5db, depending on the signal quality at
the receiving end. In this case, no external CSU is required.
short length: Matches transmission line shorter than 655 feet. The argument length
can take 133ft, 266ft, 399ft, 533ft, and 655ft, depending on the length of
transmission line.
Description
Using the ft1 cable command, you can configure attenuation or length of the
transmission line matched a Fractional T1 interface. Using the undo ft1cable
command, you can restore the default setting.
By default, the transmission line attenuation matched T1-F interfaces is long 0db.
This command is mainly used for configuring the signal waveform required for
different types of transmission. In practice, one can decide whether to use this
command according to the signal quality at the receiving end. If the signal quality is
acceptable, the default setting can be used.
Example
# Set the length of the transmission line matched the T1-F interface to 133 feet.
[3Com-Serial0]ft1 cable short 133ft
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