Chapter 5 UCM communication link wiring and topology
50 BMTX-SVN01C-EN
Fiber-optic modems
A Comm5 media converter/repeater (CBL 75090-4) connects a LonWorks
(FTT-10, 78 kb/s) twisted pair network to the LonWorks (1.25 Mb/s) fiber
optic network. These devices convert the electrical signals from a twisted
pair of wires to optical signals, which are sent over the fiber-optic cable.
At the other end, another CBL 75090-4 is installed.
See Figure 23 for a wiring diagram of the CBL 75090-4. One one end of
the modem, two fiber-optic ports allow two separate fiber optic connec-
tions (L Fiber and R Fiber). Each fiber-optic port accommodates a bi-
directional fiber-optic cable (400-400x) to connect to a CBL 75090-4 at
another location. The other end of the modem provides a grounding ter-
minal (Case), ac power terminals (–V, +V), and Comm5 communication
link wiring terminals (Net A).
Figure 25. Comm5 media converter/repeater (CBL 75090-4)
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