Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Table 14. Short Haul Fiber Interface Module, Controls and indicators
Item
Name/Description Function
1 Connector Motherboard connector (connects to the IMUX 2000 motherboard directly
behind the DS562I module).
2 DATA LED (green) Valid data when illuminated. Indicates that the Fiber Data is valid with no bit
errors. Extinguished or pulsing indicates bit errors and or loss of signal.
3 YEL ALARM LED
(yellow)
YELLOW alarm when illuminated. Indicates that the remote fiber receiver has
failed and the remote transmitter is sending yellow code detected by the local
fiber receive channel.
4 RX Fiber Optic Detector Connects to fiber optic cable from remote end.
5 TX Fiber Optic Emitter Connects to fiber optic cable to remote end.
6 DIP switch SW1 SW1-1 Selects Normal Data or Inverted Data
DOWN (ON) = Normal Data (non-inverted)
UP (OFF) = Inverted Data
SW1-2 to SW1-4 Not used
The MA-620 is a single width module, which consists of an input section (detector) and an output
section (emitter). The MA-620 provides an interface between synchronous electrical signals and
multimode optical fiber. The present design operates with TTL logic-level RS449 equivalent signals
generated by the DS562I at a data rate of 64kb/s. Clock and data signals are present on the dual row
connector at TTL levels and uses a clock generated by the IMUX instead of recovering one from the
interface. There are a few pins on the same connector which indicate to the IMUX what type of
interface is installed. The module has a green LED to indicate when valid fiber data is present and a
yellow LED to indicate when a YELLOW alarm is being received. On hot insertion, the MA-620 can
take up to 10 or 15 seconds to initialize. The fiber can be looped back onto the IMUX for diagnostic
purposes.
IMUX
Connector
TX Data
RX Data
RX Clock
TX Clock
Module
Adapter ID
Optic Out
Optic In
Data Present
Yellow Alarm
Figure 11. MA-620 Short Haul Fiber Interface Module, block diagram
RFL DS-562I RFL E
lectronics Inc.
June 14, 2007 23 (973) 334-3100
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