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VS-900 Architects and Engineering Specifications v1.0
12
3 SYSTEM FUNCTIONS
Note: “Master Station” refers to proprietary system master station. “Telephone Master Station”
refers to a single line telephone used as a limited-function Master Station. “Telephone Line” refers
to outside telephone line communication.
3.1 STATION COMMUNICATION
3.1.1 SUB-STATION TO MASTER STATION (OR TELEPHONE MASTER STATION)
Sub-station call-in to a pre-assigned Master Station (or group of Master Stations) shall be
activated by pushing and releasing the Sub-station call button. A brief call tone shall sound at the
Sub-station to alert the caller when the call has been answered. Communication shall be hands-
free at the Sub-station location. Sub-stations equipped with a call lamp shall flash the call lamp on
and off immediately after call initiation. When the call is answered, the call lamp mode shall
change from flashing to steady-on state. After the call is terminated, the call lamp shall revert
back to the off state.
3.1.2 MASTER STATION (OR TELEPHONE MASTER STATION) TO SUB-STATION
Calling a Sub-station from a Master Station shall be accomplished by dialing the desired Sub-
station number either with the handset on-hook or off-hook. Calling a Sub-station from a Master
Station shall activate a brief tone at the Sub-station after which the calling party's voice may be
heard and communication may commence. Sub-stations equipped with a call lamp shall light to
steady-on state. Following a brief call tone, the Master Station shall be automatically connected to
the Sub-station. The Master Station's voice shall be heard at the Sub-station while the Master
Station operator is talking, and the Sub-station's voice shall only be heard at the Master Station
when the Master Station operator stops talking. To terminate the conversation, the Master Station
shall replace the handset or press the [C] key, which will also change the Sub-station call lamp to
the off-state.
3.1.3 MASTER STATION TO MASTER STATION (OR TELEPHONE MASTER STATION)
Calling a Master Station or Telephone Master Station from a Master Station or Telephone Master
Station shall be accomplished by dialing the desired station number either with the handset on-
hook or off-hook. A trill call tone shall be heard at the calling station handset or from the station's
internal speaker if dialed with the handset on-hook. A trill call tone shall be heard at the called
station. Lifting the handset shall stop the call tone and allow conversation to proceed.
Alternatively, the call may be answered by pressing the [PTT] key for hands-free conversation.
Either party may terminate the conversation by replacing the handset or pressing the Master
Station’s [C] key.
3.2 CALL-IN TIME-OUT
The programmable Call-in Time-out function shall automatically terminate a call-in from “Normal”
priority Sub-stations after a specific time if the call is not answered. The time-out period shall be
programmable in one minute increments from one to ninety-nine minutes.
3.3 CONVERSATION TIME-OUT
The programmable Conversation Time-Out function shall automatically terminate intercom
conversations after a pre-programmed duration, programmable in ten second increments from
ten to nine hundred and ninety seconds. When the limited time is reached, a warning signal tone
shall be transmitted to both the calling and called parties to terminate the conversation. The
Conversation Time-Out shall not apply to “Emergency Conference”, “Outside-Line Telephone
Conversation” or “Emergency Priority Sub-Station Calls”.
3.4 CONVERSATION MODES
Three different conversation modes shall be employed, depending on the type of stations in use.