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VS-900 Architects and Engineering Specifications v1.0
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3.19 EXTERNAL SOURCE DISTRIBUTION
The External Source Distribution function shall allow distribution of an external audio source to up
to nineteen (19) zones. The function shall be activated by providing a continuous make contact
closure to one of four trigger inputs. Up to 19 paging zones can be assigned to each one of a total
of four trigger inputs in system programming. Each zone shall include up to 1,024 Sub-stations
and up to 16 selective external public address equipment outputs. During the activation input, the
external source shall be distributed to the pre-programmed zones. The function shall be
terminated when the activation input is broken. During operation, any other input will not accept a
make contact closure. Sub-stations designated as "Emergency" priority shall not be accessed by
the External Source Distribution function.
3.20 TELEPHONE LINE FUNCTIONS
The security intercom system shall accept up to two outside telephone lines per exchange,
allowing the system's Master Stations and Telephone Master Stations to place or receive outside
telephone line telephone calls.
3.20.1 OUTGOING TELEPHONE CALLS
Outside telephone lines shall be accessible by dialing a pre-programmed single-digit access
number to produce an audible dial tone. The telephone number may then be dialed and after the
called party answers, conversation may commence. Replacing the handset or pressing the [C]
key shall terminate the conversation.
3.20.2 INCOMING OUTSIDE TELEPHONE LINE CALLS (DIRECT-IN LINE)
The Direct In-Line function shall allow an incoming outside telephone call to sound a call tone at a
pre-programmed representative and up to 3 member Master Stations and/or Telephone Master
Stations within the same exchange that is connected to the outside telephone line. Lifting the
handset or pressing the [PTT] key (Master Station only) shall terminate the calling tones at all
masters in the group, allowing conversation to begin.
3.20.3 INCOMING OUTSIDE TELEPHONE LINE CALLS (DIRECT-IN DIALING)
The Direct In-Dialing function shall allow outside telephone line calling parties to direct-dial a
station number and be connected to a desired Master Station, Telephone Master Station or Sub-
station. When a call is received from the outside telephone line, the security intercom system
shall automatically respond by transmitting a dial tone to the calling party. After hearing the dial
tone, dialing the station number shall connect the calling station to the called party. If the calling
party does not dial a station number within 10 seconds after the dial tone is transmitted, the
registered Direct-In Line stations shall be called. If the called station does not answer for 30
seconds or more after the calling party dials the station number, the call shall be canceled. Calls
shall be automatically forwarded if the station called from the outside telephone line is currently in
Call Forwarding, Busy Call Forwarding or No-Answer Call Forwarding mode. Calls shall not be
automatically forwarded when the station called from the outside telephone line is currently in
Outside telephone line Call Forwarding mode.
3.20.4 OUTSIDE TELEPHONE LINE CONNECTION TIME-OUT
The Outside Telephone Line Connection Time-Out function shall limit the duration of connection
with the outside telephone line to a duration of one (1) to ninety-nine (99) minutes in one (1)
minute intervals. When the limited time is reached, a warning signal tone shall be transmitted to
both the calling and called parties.
3.20.5 OUTSIDE TELEPHONE LINE CALL FORWARDING
See section 3.12.4.
3.20.6 TIME-BASED OUTSIDE TELEPHONE LINE CALL FORWARDING
See section 3.12.5.