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VS-900 Architects and Engineering Specifications v1.0
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depending on the conversation partner. 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 shall be the (insert preferred manufacturer and model here)
2.3.3 ECONOMY SUB-STATION
The Economy Sub-station shall include a heavy-duty faceplate, momentary-action call switch,
loudspeaker and matching transformer. The faceplate shall be brushed stainless steel, #14
gauge. Pushing and releasing the sub-station’s call button shall initiate call-in to a pre-
programmed Master Station, Telephone Master Station or Master Station Group. The
loudspeaker shall have a 1.57" (4 cm) Mylar cone with a frequency response of 300 Hz to 4 kHz.
The output sound pressure level at a distance of 1 meter with 1 W of input power applied shall be
82 dB SPL. The matching transformer shall be rated at 1 W at 25 V line with rated primary
impedance of 625 ohms. The sub-station shall mount to a two-gang electrical box with adapter
ring using included #6-32 nickel-plated steel, slotted, oval head mounting screws. The faceplate
dimensions shall be 4.72" x 4.72" (120 mm x 120 mm). The sub-station shall maintain reliable
operation in the ambient temperature range of +14 to +122 degrees F (-10 to +50 degrees C).
The sub-station shall weigh 0.90 lb. (410 g)
Each Sub-station shall connect to a unique Sub-station Line Card port with a single, shielded,
twisted pair cable with maximum service distance as follows: #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). Systems
requiring more than one shielded, twisted pair cable for each Sub-station shall not be acceptable.
The security intercom sub-station shall be the TOA model RS-150.
2.3.4 INDOOR SUB-STATION
The Indoor Sub-station shall include a heavy-duty faceplate, momentary-action call switch,
loudspeaker and matching transformer. The faceplate shall be brushed stainless steel, #11
gauge. The call switch shall be vandal-resistant. Pushing and releasing the sub-station’s call
button shall initiate call-in to a pre-programmed Master Station, Telephone Master Station or
Master Station Group. The loudspeaker shall have a 1.57" (4 cm) Mylar cone with a frequency
response of 300 Hz to 4 kHz. The output sound pressure level at a distance of 1 meter with 1 W
of input power applied shall be 82 dB SPL. The matching transformer shall be rated at 1 W at 25
V line with rated primary impedance of 625 ohms. The sub-station shall mount to a two-gang
electrical box with adapter ring using included #6-32 nickel-plated steel, slotted, oval head
mounting screws. The faceplate dimensions shall be 4.72" x 4.72" (120 mm x 120 mm). The sub-
station shall maintain reliable operation in the ambient temperature range of +14 to +131 degrees
F (-10 to +55 degrees C). The sub-station shall weigh 1.19 lb. (540 g).
Each Sub-station shall connect to a unique Sub-station Line Card port with a single, shielded,
twisted pair cable with maximum service distance as follows: #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). Systems
requiring more than one shielded, twisted pair cable for each Sub-station shall not be acceptable.
The security intercom sub-station shall be the TOA model RS-160.
2.3.5 OUTDOOR SUB-STATION
The Outdoor Sub-station shall include a heavy-duty faceplate, momentary-action call switch,
loudspeaker and matching transformer. The faceplate shall be brushed stainless steel, #11
gauge. The call switch shall be vandal-resistant. Pushing and releasing the sub-station’s call
button shall initiate call-in to a pre-programmed Master Station, Telephone Master Station or
Master Station Group. The loudspeaker shall have a 1.57" (4 cm) Mylar cone with a frequency
response of 300 Hz to 4 kHz. The output sound pressure level at a distance of 1 meter with 1 W
of input power applied shall be 82 dB SPL. The matching transformer shall be rated at 1 W at 25