Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Table 15. 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 DS-562NC module).
2 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.
3 DATA LED (green) Valid data when illuminated. Indicates that the Fiber Data is valid with no bit
errors. Not illuminated or pulsing indicates bit errors and/or loss of signal.
4 TX Fiber Optic Emitter Connects to fiber optic cable to remote end.
5 RX Fiber Optic Detector Connects to fiber optic cable from 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-620/621 is a single width module, which consists of an input section (detector) and an output
section (emitter). The MA-620/621 provides an interface between synchronous electrical signals and
multimode optical fiber. The present design using the DS-562NC module can operate at data rates
between 64kb/s and 768kb/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
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-620/621 can take up to15 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-620/621 Short Haul Fiber Interface Module, block diagram
RFL DS-562NC RFL Electronics Inc.
July
5, 2012 26 (973) 334-3100
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