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

Option

 

D i s t a n c e

1

 

0.0 dB

27.5 dB

315.0 dB

0 - 1000ft

1000 - 2000ft

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

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Image 202
AT&T Release 2.0 manual Set the Artificial Transmit Line Option, Mounting the CSU