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VS-900 Architects and Engineering Specifications v1.0
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2.4 EXCHANGE COMPONENTS
2.4.1 EXCHANGE MAINFRAME
The Exchange Mainframe shall be modular and support up to four (4) Master Stations or
Telephone Master Stations and sixty-four (64) Sub-stations. Each mainframe shall have the
capacity to accept two Master Station or Telephone Master Station Line Cards, four Sub-station
Line Cards, one C/O Telephone Line Interface Card, one Audio Function Card and one Tie-Line
Interface Card. All system cards shall have removable terminal blocks for solderless wiring
terminations.
The Exchange Mainframe shall require up to two external Power Supply Units with a maximum
current consumption of 7 A. A 24 VDC input shall be available for use with a backup power
supply to maintain operating capability in the event of AC Mains power failure. The Exchange
Mainframe shall have a Power ON/OFF switch and LED’s for Power and Status indication.
System cards shall connect to an integral backplane motherboard with onboard microprocessor,
real-time clock and an internal power supply board with field-replaceable fuses. The speech path
configuration shall be a time sharing switch with twelve types of internal sound sources. System
programming shall be performed exclusively with an external computer and all parameters shall
be stored in EEPROM. Systems requiring a backup battery for programming data storage shall
not be acceptable. Two RS-232C ports, D-sub connector, 9-pin, female shall be available for
separate programming and data logging connections.
Operating temperature range shall be +32 to +104 degrees F (0 to +40 degrees C). The
enclosure finish shall be pre-coated steel plate, black, and 30% gloss. Dimensions (W x H x D),
excluding the rack mounting bracket, shall be 16.54” x 17.47” x 11.35” (420 x 443.7 x 288.3 mm)
and weight shall be 28 lbs. (12.7 kg). The exchange mainframe shall be rack-mountable and
occupy (10) EIA 19” rack spaces. An accessory wall-mount bracket shall be available with
material and finish steel, black, electrode position paint with dimensions (W x H x D) of 15.41” x
17.32” X 2.28” (391.4 x 440 x 58 mm) and weight of 4.63 lbs. (2.1 kg). System programming
software, installation/operators manuals shall be included with each mainframe.
The Exchange Mainframe shall be the TOA VS-900MF.
The Exchange Wall-Mount Bracket shall be the TOA YC-303.
2.4.2 POWER SUPPLY UNIT
The Power Supply Unit shall provide two 20 VAC, 2 A AC outputs to the Exchange Mainframe
and support a maximum of 2 Sub-station Line Cards. The AC mains power requirements shall be
110/120 VAC, 50/60 Hz. An optional rack-mount panel shall allow side-by-side rack mounting of
two Power Supply Units and occupy four (4) EIA 19” rack spaces. The material and finish shall be
steel plate with ivory color with dimensions (W x H x D) of 6.30” x 2.68” x 7.01” (160 x 68 x 178
mm) and weight of 6.17 lbs. (2.8 kg).
The Power Supply Unit shall be the TOA PU-200.
The Rack Mount Panel shall be the TOA PN-100B.
2.4.3 MASTER STATION LINE CARD
The Master Station Line Card shall be powered by the Exchange Mainframe and provide
connection ports for two Master Stations. Each Master Station port shall have an associated
recording output, 0 dBV, unbalanced and a control activation port, open collector, 24 VDC
maximum, 20 mA. Control activation shall occur immediately after communication has been
established and deactivate immediately after communication has been terminated.
Each Master Station shall connect to a unique Master Station Line Card port with a single twisted
two pair cable with the following wire gauges and maximum service distances: #20 AWG: 7546