Talk Group Translation; Private Calls; Psu Talk Permit Tones - Futurecom Mobexcom P25 Installation & Programming Manual

8M083X01 Rev. 16
6881013Y39
DVRS Installation & Programming Guide – PART II
If Proxing is Disabled then the Local PSU and the MSU must have the same TG
selected in order to enable Local PSU affiliation and communications.

Talk Group Translation

When TG translation is enabled in the DVR for a specific PSU TG ID, then any call that
is received by the DVR from the Local PSU with this TG ID will be translated to the ID of
the TG currently selected on the MSU's control head.
The Local PSU could be programmed with just one TG ID and if this ID is programmed
in the DVRS TG Translation list, the PSU call will always be translated by the DVRS to
the TG ID currently selected on the MSU control head.
This feature is especially useful in applications where there is a need to support more
then 96 TGs on the Local PSUs (only up to 96 TGs can be programmed in the
Conventional ASTRO PSU).
For instance, if the Local PSU is on TG A, which is programmed in the DVRS TG
Translation list and the MSU is on TG B then all inbound Local PSU calls will be
repeated by the DVR locally and to the System on TG B. If the MSU mode is then
switched to TG C then the Local PSU calls will be repeated on TG C etc.
TG Translation requires that TG Proxing is enabled.
When TG proxing is enabled and the TG selected on the Local PSU is programmed in
the DVRS Translation Table, the DVRS will affiliate the Local PSU on the TG that is
selected on the MSU.
If TG Proxing is enabled but the Local PSU is on a TG that is not in the DVRS TG
Translation list then the DVRS will proxy any inbound / outbound calls.
Outbound call (System call) received on the currently selected MSU TG is repeated 'as
is' i.e. without any translation. Therefore the Local PSUs need to be programmed with
Normal Squelch (or NAC = F7E) in order to hear those calls.
Encryption Key Translation is not supported by DVRS.

Private Calls

Private Calls (Local to Local PSU; Local to System PSU; System to Local PSU) are
supported on 'DVRS Enabled' PSUs only. Generic P25 PSU mode does not support
Private Calls via DVRS.

PSU Talk Permit Tones

'Go Ahead' tones are generated in the 'DVRS Enabled' PSUs.
Different tones are generated to indicate if the DVRS is in Local or System Mode or the
call is P25 Encrypted.
As a programming option Local Mode tones can be generated when the System is busy
and only Local repeat is available. Alternatively, the PSU user can get 'System Busy'
tones and be forced to wait for system grant (see 'Digital System Setup Menu' in the
DVRS Programming section).
Generic P25 PSU mode does not support Talk Permit Tones when operating through the
DVRS.
TM TM
Digital Vehicular Repeater Interfaced to XTL 5000 (O3 or O5) or XTL 2500 (M5)
April 2014
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