Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
RFL Electronics Inc.
I N S T R U C T I O N D A T A
RFL VF-8A Selective Calling Unit
DESCRIPTION
The RFL VF-8A Selective Calling Unit is a two-wire selective calling “party line” module designed
for use in IMUX 2000 terminal and drop/insert multiplexers. It accepts a single voice channel as input,
and converts it into a 64kbps signal which can be transmitted over T1, E1 or other digital
communications facilities. It does this using μ-law PCM encoding and decoding for both T1 and E1
systems. The VF-8A automatically detects if the system is T1 or E1 and configures itself appropriately.
The VF-8A is remote-controllable when installed in an RFL remote controllable shelf. The following
module parameters can be configured remotely via SCB or locally via DIP switches. A DIP switch
setting will control whether the card is in remote or local mode.
o Selectable time slot assignment
o Selectable TX bus direction(s)
o 3-digit Station ID
o Number of ring attempts
o Extended range transmit and receive level settings
o Service on/off
o Selectable Busy Circuit modes
RFL VF-8A RFL Electronics Inc.
August 6, 2010 1 (973)
334-3100
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