Fiber-Optic Links; Figure 44. Duplex Cable (Lightguide) With Paddleboard Transmitter And - AT&T System 85 Installation And Test

Fiber-Optic Links
Figure 44 is an example of a duplex cable (lightguide) with the paddleboard transmitter and
receiver. Figure 45 illustrates the proper mounting position for the paddleboard transmitter
and receiver.
Four types of duplex cable may be used for the lightguide connections; Group 461 (LL2A-B)
or Group 463 (LB2A-B) for RMI, and Group 460 (LL2A-B) or Group 462 (LB2A-B) for TMS.
The leads of the LL2A-B (62.5 micron) cable are designated Fiberl and Fiber2, and the
LB2A-B (50 micron) leads are designated Blue and White. These cables are fragile and
should be routed from the appropriate carrier to the LCIT (Figure 46) outside the overhead
duct work. Figure 47 illustrates how the fiber cables should be routed.
The procedure for adjusting the fiber links should not be performed until all the cabling and
hardware installation is complete. The procedure to adjust the fiber links is in the
"CUSTOMIZING FIBER-OPTIC LINKS" section.
982C OR 982J
TRANSMITTER
TEST FULL
111
NORM HALF
1250A
1350 B
RECEIVER
9820
ID
LEDS
FIBER 1/BLUE
FIBER 2/WHITE
DUPLEX CABLE
LL2A-B
(GROUP 460-TMS,
GROUP 461-RMI)
OR
LB2A-B
(GROUP 462-TMS,
GROUP 463-RMI)
FIBER 1/BLUE
FIBER 2/WHITE
Figure 44. Duplex Cable (Lightguide) With Paddleboard Transmitter and Receiver
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