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Connecting the Control Unit to the Network Interface
Set the Artificial Transmit Line Option
Open the top panel of the ESF T1 CSU and set the Line Build-Out (LBO)
switch to the proper option, which depends on the distance from the CSU to
the first line repeater (see Table 4-14).
Table 4-13. Artificial Transmit Line Options
Position Distance
Option
1
0.0 dB
0 - 1000ft
2
7.5 dB
1000 - 2000ft
3
15.0 dB 2000 — 3000 ft
NOTE:
■ The required setting for the LBO switch is usually specified by the
telephone company.
■ The receive path contains a fixed 7.5 dB artificial line and an
automatic line build-out (ALBO); circuit, which automatically
compensate for signal levels in the range of 0 to -27.7 dB.
Step 2: Mounting the CSU
When you are finished setting the CSU switches, mount the CSU in a relay
rack or on a shelf as a standalone unit.
Installing the Channel Service Unit
4-25