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GE Grid Solutions
2.8.3 Adapter Modules
Plug-on adaptor modules are available for connecting RS-485 serial, plastic or glass fiber cables
to the D.20 Communication Interface and the D.20 Fiber Optic Splitter modules.
• GFO: Glass fiber optic adaptor with an SMA screw lock or ST twist lock connector
• PFO: Plastic fiber optic adaptor with a snap-in lock connector
• RSR: RS-485 repeater
HDLC
HDLC
2.8.4 D.20 Fiber Optic Splitter
The D.20 Fiber Optic Splitter (DFS) is used to break out the D.20 Link into four separate D.20
Links, for applications with clusters of peripherals at different locations:
From D20/D200, or from
upstream I/O Peripherals
The D.20 Fiber Optic Splitter (DFS) provides a 1:4 interface between the RS-485 serial D.20
Link and up to four fiber optic links. The DFS has two RS-485 ports, one input port and one port
continuing the D.20 Link daisy chain. Up to four plastic or glass fiber optic adaptors plug onto
the DFS module to connect the fiber cables. See Figure 43. The DFS installs on a standard 19"
rack and is two rack units high.
GE Information
D.20 Link
D.20 Link
RS-458 Repeater
D.20 Link
D.20 Link
RS-458 to Fiber Converter
Figure 41 DCI Modes of Operation
To split out the D.20 Link
HDLC
D.20 Splitter
Figure 42 D.20 Fiber Optic Splitter
D20/D200 Technical Overview
D.20 Link
RSR
D.20 Link
D.20 Link
PFO/
D.20 Link
GFO
PRPI-019-3.00-10
HDLC
F.O.
Up to four
D.20 Links
73
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