Multi-Coded Squelch: Normal (Multi-Pl/Dpl Not Enabled); Multi-Coded Squelch: Multi-Pl/Dpl - Futurecom PDR8000 Manual

PL and DPL codes are predefined in a common way, to allow use across radios manufactured
by multiple vendors. The Rx and Tx squelch code entries in the table can be set to a defined PL
Code, a defined DPL Code, or set to OFF (Carrier Squelch operation).
Squelch Tail Elimination is a method used to prevent the receiving radio from hearing a brief
noise (squelch tail) at the end of each transmission. By having the transmitter provide a phase-
shifted signal (for PL), or a specific tone (for DPL), the receiver can quickly detect the end of the
transmitted signal and mute the unwanted noise. When PL is used, Tx STE and Rx STE can be
set to Off, -135° phase shift, +135° phase shift, or -180° phase shift. When DPL is used, Tx
STE and Rx STE can be set to either Off or DPL (enabled).
6.6.1.2 M -C
ULTI ODED
If the active PDR8000 channel is configured to use an Access Code Table for Normal PL/DPL
operation, then the first row of the PL/DPL table is enabled. That row defines the Tx and Rx
behavior associated with all traffic on the channel.
The PDR8000 only processes analog signals received over the air with PL or DPL that is equal
to the Rx PL/DPL code entry found in the first row of the table. In the first row, if the Rx Squelch
Code is set to OFF (Carrier Squelch), then all received signals on that channel that meet the
Signal Strength and/or Signal Quality criteria (see 6.6.1) defined for this channel are processed
by the PDR8000 (i.e. no PL/DPL filtering is done). Received signals not meeting the
strength/quality criteria are ignored. At the end of a received signal, PDR8000 can be
configured to quickly mute by recognizing a PL/DPL STE (Squelch Tail Elimination) indication
sent by the transmitting subscriber unit. PDR8000's Rx STE should be set to match the Tx STE
sent by the subscriber units.
When the PDR8000 sends a transmission, it encodes Tx Squelch Code configured in the first
row of the Access Code table. At the end of the transmission, PDR can be configured to send a
configured (STE: Squelch Tail Elimination) signal to help receiving radios quickly mute at the
end of the transmission. The configuration for PDR8000's Tx STE should be set to match the
Rx STE expected by the subscriber units.
6.6.1.3 M -C
ULTI ODED
If the active PDR8000 channel is configured to use an Access Code Table configured for Multi-
PL/DPL operation, then the PDR8000 utilizes the full table to define filtering and
translation. The PDR8000 only processes analog signals received over the air with PL or DPL
that is equal to any of the Rx PL/DPL code entries found in any enabled row of the table. At the
end of a received signal, PDR8000 can be configured to quickly mute by recognizing a PL/DPL
STE (Squelch Tail Elimination) indication sent by the transmitting subscriber unit. PDR8000's
Rx STE in that row of the table should be set to match the Tx STE sent by the subscriber units.
When the PDR8000 repeats an over-the-air analog transmission it encodes the Tx PL/DPL
found in the same table row as the received signal's Rx PL/DPL. At the end of the transmission,
PDR can be configured to send a configured (STE: Squelch Tail Elimination) signal to help
receiving radios quickly mute at the end of the transmission. The configuration for Tx STE
should be set to match the Rx STE expected by the subscriber units.
2021-11-15
S : N
QUELCH ORMAL
S : M
QUELCH ULTI
PDR8000® Portable Digital Repeater Product Planner
(M -PL/DPL
ULTI
-PL/DPL
Document 8K088X02 R5.0
)
NOT ENABLED
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