PULSECOM 4TOLB-3L1 - Connector Pin Functions and Cabling for 4 TOLB-3 L1; Adjustments and Alignment for 4 TOLB-3 L1

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4TOLB-3L1
1306, Issue 2, May 1992
Loopback Activation Options
The loopback circuit can be activated by one of three methods:
1) Tone Activation—Requires placement of the pc board S9-TONE switch to the IN
position and reception of the LB tone.
2) Manual Activation—Requires placement of the front-panel MAN switch to the ON
position.
3) Local Activation—Requires connection between the LOCAL LB lead (pin 45 for
D4/COT or pin 25 for RT) and the LOCAL LB GND lead (pin 19 for D4/COT or pin
23 for RT).
Loopback Time-Out
This option allows selection of the time-out interval. Set switch S9 to the 4 position for
four minutes or to 20MIN for 20 minutes. After a tone loopback activation, a second tone
should be received to deactivate the LB circuit. The timer will return the unit to the
normal, non-loopback condition if the reset tone is not received within the time-out
interval.
B. Connections
All connector pin functions are detailed in Figure 4. Connections to a prewired D4
channel bank are identified. SLC 96 connections are also shown.
The unit is a Pulsecom Type D4 plug-in module. It occupies a 1.5-inch wide mounting
space in a standard Pulsecom PD4, AT&T D4, or equivalent channel bank; see Figure 5A.
The unit can also be installed in a Pulsecom PSC-96, AT&T SLC 96, or equivalent channel
bank; see Figure 5B.
C. Adjustments
General
Alignment of the channel unit consists of selecting the desired functions by setting pc
board option switches to the appropriate positions. The procedure for selecting the
switches may be either a “prescription” or a verified “in-line” alignment.