Tyco Electronics M7200 - Manual (Page 41)

MM-011553-001, Rev. A
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6.34.2 V-TAC GPS Interlock
The V-TAC GPS Interlock feature is enabled or disabled through programming by the system
administrator. If enabled, the V-TAC can transition from XCOV or XCOV-TG to the Mobile Radio mode
of operation based on the location and velocity of the VTAC (provided by GPS) in order to prevent a
rolling VTAC.
The distance and velocity required for transition are programmed by the system
administrator.
The VTAC will transition from XCOV or XCOV-TG operation to the Mobile Radio mode of operation if:
•
The distance traveled by the VTAC exceeds a maximum permissible distance from a reference point.
The maximum distance is configured via programming.
The reference point is the location of the V-TAC based on latitude/longitude provided
by the GPS when the V-TAC first transitions into XCOV or XCOV-TG, either directly
at power-up, from V-TAC Mobile Radio mode, or from VTAC SOI mode.
Distance traveled is the current location of the VTAC, based on the latitude/longitude
provided by the GPS, from the reference point.
•
The velocity of the VTAC exceeds a maximum velocity threshold in miles/hour. The maximum
velocity threshold is configured through programming. Velocity is based on the velocity information
provided by the GPS.
If location and velocity information is not provided by the GPS and the VTAC is in XCOV or XCOV-TG
mode, VTAC GPS Interlock processing is suspended. When location and velocity information is provided
by the GPS, VTAC GPS Interlock processing is resumed, taking the first valid GPS position coordinates
as the location reference point and acting immediately on GPS provided velocity.
This is intended to cover the situation where the GPS is not operational. If the GPS is out of coverage, the
last location and velocity information provided by the GPS and will be deemed useable.
When the VTAC transitions from XCOV or XCOV-TG mode to Mobile Radio mode the VTAC will
disconnect all connected clients.
When the VTAC transitions from XCOV or XCOV-TG mode to Mobile Radio mode, an audio and visual
indication is provided to the operator. This indication is identical to the indication of the mode transition
based on the external event switch.
When the VTAC is in Mobile Radio mode, the VTAC can return to XCOV or XCOV-TG mode only by
the external event switch or manually via the control head menu.
If the VTAC is in XCOV or XCOV-TG mode and the VTAC transitions to Mobile Radio due to
exceeding the distance and velocity thresholds, the VTAC will not transition back into XCOV or XCOV-
TG mode when it falls back within the distance or velocity thresholds.
6.34.3 Scene-Of-Incident Mode (“SOI”)
SOI mode is user-selectable using the V-TAC’s “Vmode Menu.” SOI mode provides a local repeater
function with no network connection. It supports two concurrent voice calls, and it supports
communication between other mobiles and portables connected to the V-TAC via the SOI mode.