| The VSC-X (Extension
Interface Converter) is a voice and signaling converter,
enabling connection of voice equipment to communications
equipment operating with 2-wire/4-wire E&M
interface. The VSC-X provides FXO loop start interfacing
to the E&M interface.
The VSC-X interfaces
between a PABX extension or a telephone line from the
public exchange, and the 2-wire/4-wire E&M
interface. The unit enables remote extension from the
PABX through digital multiplexers and a remote VSC unit.
(For VSC unit see data sheet.)
The VSC-X recognizes the
ring signal (20 Hz, high voltage), translates it into
the proper signaling standard, and sends the resulting
signal over the "M" lead. When detecting
activity on the "E" lead, the VSC-X activates
both the off hook simulation (by activating the loop
towards the PABX or exchange), and the "M"
lead. Different "M" and "E"
signaling types are strap-selectable to match virtually
any PABX interface.
The voice interface on
the E&M side is switch-selectable for either 2-wire
or 4-wire operation. The voice, to and from the
telephone/extension is attenuated by 3 dB nominally when
4-wire is selected.
The VSC-X is available as
either a desk-top unit or as a card for insertion in the
VSC-MN 19" card-cage. The card-cage can carry up to
14 VSC-X/R cards. The VSC-X/R cards can be mixed with
the VSC-R (FXS) cards.
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