Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL VF-10D RFL Electronics Inc.
June 23, 2001 5 (973) 334-3100
Model Voice
Number Connections Application Figure
MA-301 50-pin Telco Used with multiple VF-10D 1
Connector modules
MA-303 RJ-11 Jack Used with VF-10D module 3
MA-303B Removable Used with VF-10D module 4
terminal block
The MA-301 accepts a 50-pin Telco connector (Amphenol 57-30500 or equivalent,
as shown in Figure 1.) One MA-301 Module Adapter can be used to connect up to
three RFL VF-10D modules, for a total of up to three voice channels. If you will be
using more than one module with an MA-301, they must be inserted into adjacent
slots in the multiplexer. Ribbon cables are provided with the MA-301 to make
connections to it from the second and third module locations. (See Figure 2.) The
MA-301 does not contain the input protection circuits that are on the MA-303. If
the input signals are subject to transients, protection must be added prior to the
MA-301.
The MA-303 provides two RJ-11 jacks for connection to the voice circuits, and two
bantam jacks (Line and Drop) for each channel as shown in Figure 3. When used
with the RFL VF-10D, only the connectors for Channel 1 are used. The bantam
jacks may be used for test access. Each LINE jack provides access to the line from
the equipment side.
The MA-303B, shown in Figure 4, is similar to the MA-303, except it has
removable terminal blocks in place of the RJ-11 connectors for the voice
connection.
Make sure the module adapter you are installing is correct for the desired
application.
4. Insert the Module Adapter into the rear of the shelf directly behind the module slot where the
RFL VF-10D module will be installed, and make all connections to the module adapter.
If an MA-301 Module Adapter is being used, plug the 50-pin Telco cable end
connector into its mating 50-pin connector on the module adapter.
If an MA-303 or MA-303B Module adapter is being used, plug in the RJ-11
connector or the removable terminal block, as applicable, into the Channel 1 jack
on the module adapter. The only electrical interface connections that have to be
made to the RFL VF-10D are RING and TIP connections, which are made to
terminals 3 and 4 on the RJ-11 connector, or to the screw terminals on the
terminal block. TIP is the top terminal, and RING is the bottom terminal. Refer to
Figures 3 and 4 as applicable.
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