RFL Electronics Inc.
I N S T R U C T I O N D A T A
RFL (C37.94) Fiber Service Unit
Multimode
107460-1 RS-449
107460-2 V.35
107460-3 G.703
107460-4 X.21
107460-5 E1
Single Mode
108015-1 RS-449
108015-2
V.35
108015-3
G.703
108015-4
X.21
108015-5 E1
Multi and Single mode mounted in 1U chassis
107460-1-1 RS-449 (Multimode)
107460-1-2 RS-449 (Single Mode)
107460-2-2
V.35 (Single Mode)
107460-3-1 G.703 (Multimode)
107460-5-1 E1 (Multimode)
RFL Electronics Inc. Boonton, New Jersey USA
RFL FSU 107460-1
RS - 449
R
X
TX
DA
TA
SY
N
C
YEL
PWR
Figure 1. Typical RFL Fiber Service Unit, Front Panel view
DESCRIPTION
The RFL Fiber Service Unit (FSU) provides an interface between synchronous electrical signals and
optical fiber. It can be used with the RFL 9300, RFL 9745, RFL IMUX 2000 or other types of
multiplexers. It can also be used with any other C37.94 compliant, end device. There are a total of five
varieties of FSUs using both single and multimode fiber heads. They use RS-449, V.35, G.703, X.21
and E1 as inputs and outputs on the non-fiber side of the connection. Note that there is a modification
allowing the unit to be mounted into a 1U Chassis. The FSU is a stand-alone device, which is
essentially a translator to and from data sent using these five interface standards in accordance with the
IEEE C37.94 fiber protocol. The G.703 is 64,000 bps only and thus it has N fixed at 1. The other four
versions use a DIP switch to set the value of N. The characteristics of each of the five types of Fiber
Service Units, is shown in Tables 1, 2 and 3. Mounting dimensions are shown in Figure 12, except for
the 1U version of the unit which is shown in Figure 6 and 9.
RFL C37.94FSU
RFL Electronics Inc.
May 20, 2013
1
(973) 334-3100
