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

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