Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
SHORT HAUL FIBER INTERFACE (MA-620 and MA-621)
The MA-620/621 is a Short Haul Fiber Interface Module, which supports IEEE standard C37.94
for N times 64 kilobit per second Optical Fiber Interfaces between Teleprotection and Multiplexer
Equipment. When used with the DS562NC, the MA-620/621 complies with the standard for N = 1
through 12. The module is mounted at the rear of an RFL IMUX 2000 chassis, directly opposite the
DS562NC module. The input power requirement is +5 Volts at 200 mA maximum from the chassis
supply. The input drive signals are TTL logic-level, generated by the DS-562NC.
Table 14. Short Haul Fiber Interface Module, Characteristics at 25º C
Module Assembly
Number
Type Wavelength/
Mode
Connector
Type
Receiver
Sensitivity
(av
e
rage)
Tx power (average) Typical
Distance
MA-620 107245 LED
Emitter/
Detector
830 (+/- 40 nm)
multimode
ST -11dBm
to -32dBm
-11dBm to -23dBm average
into 50µm fiber
-11dBm to -19dBm average
into 62.5µm fiber
Up to 2km
(1.2 mi.)
MA-621 107245-1
LED
Emitter/
Detector
1300nm
singlemode
ST -35dBm
-20dBm to -22dBm average
into 9µm fiber
Up to 10km
(6.2 mi.)
MA620
DATA
YEL
ALARM
RX
TX
1
2
3
4
5
6
SW1-4
SW1-1
Figure 10. Controls and indicators, MA-620/621 Module Adapter
RFL DS-562NC RFL Electronics Inc.
July
5, 2012 25 (973) 334-3100
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