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VS-900 Architects and Engineering Specifications v1.0
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ft./1.43 mile (2.3 km); #22 AWG: 4921 ft./0.93 mile (1.5 km); #24 AWG: 2953 ft./0.56 mile
(0.9km).
The Master Station Line Card shall be the TOA VS-900MS.
2.4.4 TELEPHONE MASTER STATION LINE CARD
The Telephone Master Station Line Card shall be powered by the Exchange Mainframe and
provide connection ports for two DTMF-based analog telephones designed in compliance with
FCC Part 68 with support for Caller-ID signaling. Each Telephone 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 Telephone Master Station shall connect to a unique Telephone Master Station Line Card
port with a single twisted pair cable with total loop resistance, including telephone, to be no
greater than 500 ohms.
The Telephone Master Station Line Card shall be the TOA VS-900AL.
2.4.5 SUB-STATION LINE CARD
The Sub-station Line Card shall be powered by the Exchange Mainframe and provide connection
ports for sixteen Sub-stations. Two links: one voice link and one voice/paging link shall allow two
simultaneous conversations or one conversation and one paging function. Conversation method
shall be half-duplex by voice-operated switch controlled by the Master Station or Telephone
Master Station and simplex conversation by PTT switch controlled by the Master Station. The
combined maximum power output shall be 6 W at 25 V line. A paging output, unbalanced, -20
dBV and paging input, balanced, 25 V line, 30 W maximum shall allow connection of an external
amplifier for sub-station paging.
Each Sub-station shall connect to a unique Sub-station Line Card port with a single, shielded,
twisted pair cable with the following wire gauges and maximum service distances: #20 AWG:
4265 ft./0.81 miles (1.3 km); #22 AWG: 2625 ft./0.5 miles (0.8 km); #24 AWG: 1,640 ft./0.31 miles
(0.5 km).
The Sub-station Line Card shall be the TOA VS-900RS.
2.4.6 C/O TELEPHONE LINE CARD
The Outside Telephone Line Card shall be powered by the Exchange Mainframe and provide
connection ports for two outside telephone lines or trunks in compliance with FCC Part 68
regulations. The C/O Telephone Line Card shall be compatible with both loop and ground start
systems and use DTMF dialing. Each telephone line 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.
The C/O Telephone Line Card shall be the TOA VS-900CO.
2.4.7 AUDIO FUNCTION CARD
The Audio Function Card shall be powered by the Exchange Mainframe and provide the
following: one paging line output, 0 dBV, unbalanced with sixteen associated open collector
control outputs, 24 VDC maximum, 20 mA; one line input for external source distribution, 0 dBV,
unbalanced with four associated trigger inputs, no-voltage make contact, open voltage: 24 VDC,
short circuit current: 20 mA; and one Conference/Emergency Conference link to allow
simultaneous communication/conversation between multiple Master Stations and/or Telephone
Master Stations.