MM-013994-001, Rev. J
54
Typically, Extended Coverage is used after the vehicle’s operator has exited the vehicle with a portable
radio unit and the portable unit requires this bridging functionality to access the OpenSky radio network.
The V-TAC takes advantage of OpenSky’s TDMA capability to eliminate interference between its local
and network radio links when operating in an Extended Coverage mode, an undesirable characteristic of
many traditional vehicular repeater systems. Because the V-TAC employs this technology, interference
on the network and local radio links is minimized.
A V-TAC in Extended Coverage mode sends its alias to clients. The alias is displayed in the second line
of the dwell menu of
the client, (“VA <ali
as>”). The client
must be conn
ected to a V
-TAC running version OTP14.4 or later for the V-TAC to provide the alias to the client. If the client is connected to a V-
TAC running version OTP14.3.1 or earlier, the client displays “VA None.”
9.34.2 Change Between Extended Coverage Modes
By default, the specific Extended Coverage mode utilized is determined by settings programmed into the
V-TAC and portable radios from the system administrator or radio installation personnel. These
programmed settings determine which Extended Coverage mode the V-TAC and radios normally use and
determine the access method employed by a portable radio to connect to the V-TAC. After these settings
are programmed to the V-TAC and portable radios, each must be rebooted (powered off and then back
on) before the change takes effect.
See the following sections for instructions on how to override this setting manually. Note that the override
is only successful if the V-TAC operating mode matches the manually selected portable V-TAC mode.
9.34.3 Radio Limitations Using Extended Coverage Modes
Connecting a portable radio to a V-TAC introduces minor functional limitations. See the following
sections for a listing.
9.34.3.1 Limitations Using XCOV, XCOV-TG, and XCOV-PROF
Portable radios connected to the V-TAC using any of the Extended Coverage Modes, XCOV, XCOV-TG,
or XCOV-PROF, will not channel-scan unless they lose radio frequency contact with the V-TAC. If
manually enabled, radios will not scan network channels.
9.34.3.2 Limitations Using XCOV-TG
The following portable radio keypad functions are disabled when the radio is connected to the V-TAC
using the XCOV-TG mode: log-off, manual log-in, alerts, selective calls, PSTN calls, and speed dial
calls, SOI mode, RTT.
The following portable radio menus are disabled when the radio is connected to the V-TAC using the
XCOV-TG mode: alert destination, alert message, alert received, channel, speed dial, priority 1 Talk
Group, priority 2 Talk Group, priority 3 Talk Group, RTT, Status message, site lock and scan mode. In
addition, the user cannot change Talk Group or profile.
9.34.3.3 Limitations Using XCOV-PROF
The following portable radio keypad functions are disabled when the radio is connected to the V-TAC
using the XCOV-PROF mode: log-off, manual log-in, alerts, selective calls, PSTN calls, and speed dial
calls, SOI mode, RTT.
The following portable radio menus are disabled when the radio is connected to the V-TAC using the
XCOV-TG mode: alert destination, alert message, alert received, priority 1 Talk Group, priority 2 Talk
Group, priority 3 Talk Group and scan mode. In addition, the user cannot change Talk Group or profile.
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