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Configuring E1 and T1 Interfaces
ProCurve Secure Router Modules
Replace <value> with one of the following numbers, which are in
decibels (db):
■ -22.5
■ -15
■ -7.5
■ 0
You should set the LBO to avoid overloading a receiver’s circuits. For sensitive
interfaces or for interfaces that are connected with a long cable but separated
by a short distance, use the more negative values to prevent the line from
becoming too hot. For example, two units in close proximity should be
configured for the maximum attenuation of -22.5 dB:
ProCurve(config-t1 1/1)# lbo long -22.5
To configure LBO for a long cable to -7.5, enter:
ProCurve(config-t1 1/1)# lbo long -7.5
The default setting for LBO is 0 db.
lbo short Command. If the cable that connects the T1 interface is less than
655 feet long, use the following command:
Syntax: lbo short <value>
Replace <value> with the actual length of the cable, in feet, that separates the
two devices. You can enter a number between 0 and 655. For example, if the
ProCurve Secure Router is 500 feet of cable away from the other device, you
would enter:
ProCurve(config-t1 1/1)# lbo short 500
Based on the number of feet between the two units, the ProCurve Secure
Router will set an appropriate signal level.
Set the FDL (T1 Interfaces Only)
T1-carrier lines that use the ESF frame format support an out-of-band channel
that is used to transmit performance-monitoring and maintenance informa-
tion about the line. The facility data link (FDL) channel allows the transmis-
sion of monitoring and maintenance flags such as the yellow alarm signal.
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