3.1.8.2 Transformer Coupling
Transformer Coupling utilizes a bus coupler that contains an
isolation transformer and isolation resistors. Transformer
Coupling extends the stub length to 20 feet and provides
electrical isolation, better impedance matching and higher
noise rejection characteristics than Direct Coupling. The
electrical isolation prevents a terminal fault or stub
impedance mismatch from affecting bus performance.
Figure 3-20 Stub Coupler
Connecting to the bus using Transformer Coupling requires a Coupler for each
subsystem/terminal device and proper termination on the bus.
Figure 3-21 Transformer Coupling
(Bus B)
(Bus A)
Bus is actually in
coupler
Figure 3-22 Transformer Coupling
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