4TOLB-3L1
1306, Issue 2, May 1992
2
A. Reason for Reissue
Document Reissue
This practice has been reissued to change the power specifications in Table 3 and to add
UL recognition.
Equipment Reissue
The 4TOLB-3L1 differs from the Pulsecom 4TOLB, 4TOLB-2, and 4TOLB-1L3 channel
units as shown in Table 1. The 4TOLB-3L1 also provides sealing current with single
switch selection of source/sink/off and improved current regulation over loop length in the
source mode. A –40
°
C to +85
°
C functional temperature range and switch selection of
loopback card-edge connector assignments allow use of the 4TOLB-3L1 in SLC
®
96
applications. The four units function the same in all other respects.
Table 1. 4TOLB Equipment Differences
A. LB Tone, TRMT ATTN, and LB Gain
Model LB Tone
Total Transmit
Attenuation
Loopback
Gain
4TOLB-3L1 2713 Hz 32.5 dB
±
31.75 dB
4TOLB-1L3* 2713 Hz 31.75 dB 0,8,16 dB
4TOLB* 2713 Hz 24.0 dB 0,8,16 dB
4TOLB-2* 2400 Hz 24.0 dB 0,8,16 dB
B. TEK5/TEK6 and LB Lead Functions
Model
Lead Functions and Connector Pins
TEK5 TEK6 Local LB
Local LB
GND
4TOLB-3L1
a) D4/SLC 96 COT
b) SLC 96 RT
46
52
48
49
45
25
19
23
4TOLB-1L3*,
4TOLB*, and
4TOLB-2*
45 46 48 19
*Manufacture discontinued.
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