VS-900 Architects and Engineering Specifications v1.0
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.
3.20.5OUTSIDE TELEPHONE LINE CALL FORWARDING See section 3.12.4.
3.20.6TIME-BASED OUTSIDE TELEPHONE LINE CALL FORWARDING See section 3.12.5.