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VS-900 Architects and Engineering Specifications v1.0
5
2 SYSTEM CONFIGURATION AND COMPONENTS
2.1 SYSTEM DESCRIPTION
The security intercom system shall be designed for security applications and provide reliable and
intelligible voice communication between Master Stations, Telephone Master Stations and Sub-
stations. A Master Station shall be defined as a station that can selectively dial any other Master
Station or Sub-station in the system. A Telephone Master Station shall be defined as a single line
telephone with Caller-ID used as a limited-function Master Station to selectively dial any other
Master Station or Sub-station in the system. A Sub-station shall be defined as a station that calls
in to a pre-programmed Master Station or group of Master Stations by pressing and releasing a
call button.
2.2 SYSTEM STATION CAPACITY
The security intercom system exchange mainframe shall be modular, expandable for optimum
station configuration and capable of future expansion by adding additional station line cards
and/or exchanges as required. Each exchange mainframe shall be capable of supporting a
maximum configuration of four (4) Master Stations or Telephone Master Stations and sixty-four
(64) Sub-stations or a minimum configuration of two (2) Master Stations or Telephone Master
Stations and sixteen (16) Sub-stations. Optional tie-line cards shall allow interconnection of up to
sixteen exchange mainframes for a maximum system capacity of sixty-four (64) Master Stations
or Telephone Master Stations and one thousand and twenty-four (1024) Sub-stations.
2.3 STATION EQUIPMENT
2.3.1 DESKTOP/WALL-MOUNT MASTER STATION
The Master Station shall support duplex, half-duplex and Press-To-Talk (PTT) communication
modes, depending on the conversation partner and hook-switch status. The Master Station shall
be exclusively powered by the Master Station Line Card port. Specifications shall include a
handset and hook-switch, hands-free microphone, electret condenser type and station speaker,
dynamic type, 8 ohms, 2.24” (57 mm), 0.6 W with high/low volume switch. The Master Station
shall have an in-use lamp, handset speaker volume control (0 to +12 dB) and station number
directory. The Master Station shall also have external speaker output, 8 ohms, 0.6 W, with screw
terminal connector. The Master Station keypad shall utilize membrane-type switches and include
numeric [0-9], [*], [#], [PTT], [Cancel], [Redial], [Transfer] keys and eight user-programmable
Auto-Dial keys. A 12 digit LCD shall provide alphanumeric station number and priority status,
function and digital clock indication. The Master Station shall be suitable for desktop use or wall-
mounting with an included bracket. The operating temperature range shall be 32 to 104 degrees
F (0 to 40 degrees C). Finish shall be ABS resin, pale white with dimensions (W x H x D) of 8.50”
x 2.93” x 8.39” (216 x 74.5 x 213 mm) and weight of 2.07 lbs. (940 g).
Each Master Station shall have an integral 6-position 4-contact RJ11-type modular telephone jack
and connect to a unique Master Station Line Card port with one twisted two pair cable with
maximum service distance as follows: #20 AWG: 7546 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 Desktop/Wall-Mount Master Station shall be the TOA MS-900.
2.3.2 TELEPHONE MASTER STATION
The security intercom system shall provide direct connection capability with standard DTMF-type
analog telephones with caller-ID conforming to FCC Part #68 as limited function Master Stations
referred to within this specification as “Telephone Master Stations”. The security intercom system
shall support Caller-ID signaling and provide alphanumeric station number indication. The
Telephone Master Station shall support duplex and half-duplex communication modes,