MTR3000 Wireline: Functional Theory Of Operation 8-11
8.3.2.2.2 Other Wireline Configuration Options
All remaining Wireline configuration options may be set per Table 8-7.
Table 8-7 Wireline CPS definitions
CPS Function Description
WL Line Impedance This field sets the Wireline Rx audio (output) and Tx audio (input)
impedance of the Wireline board. The impedance of the Wireline board
must be set to match that of the backhaul interface.
WL 2 W/4 W Mode This field sets the Wireline interface for either 2-wire mode (half-duplex), or
the 4-wire mode (full-duplex) operation.
• In 2-wire mode, the console audio to and from the base station/repeater
will share a single pair of conductors. The MTR3000 Base Station/
Repeater will connect to Line 2 of the J6 backplane interface board
connector.
• In 4-wire mode, the console will use two separate pairs of wires for
transmit and receive audio. Tx audio (from the console) will connect to
J6 Line 1. Rx audio (from the base station/repeater) will connect to J6
Line 2.
WL Remote Control Mode Refer to
Section 8.3.2.2.1 on page 8-8.
This field sets the type of remote control method that the Wireline will use
to decode the function signals from the console.
There are four options: Tone Remote 7 (TRC7), Tone Remote 15 (TRC15),
Direct Current Remote (DC), and None.
• TRC7: Allows seven different channels to be selected, as well as the
monitor function and three alternate CPS defined GPIO functions.
• TRC15: Allows 15 different channels to be selected, as well as the mon-
itor function.
• DC: Allows 5 different channels to selected, as well as the monitor func-
tion.
• None: Disables all remote control functions, though the transmit and
receive audio paths are still supported via the Wireline. If "Local PTT" is
used in 2-Wire mode (half duplex), this parameter must be set to "None"
to allow the backplane PTT signal to control the direction of audio.
WL Squelch Hysteresis This field determines how much the level of transmit audio must drop below
the squelch threshold before the squelch closes. Likewise, this parameter
also indicates how much the level of transmit audio must rise above the
squelch threshold before the squelch opens. This parameter aids in
minimizing squelch chatter.
WL Tx Guard Tone This field sets the guard tone frequency detector and notch on the transit
path of the Wireline. When 2-wire or 4-wire tone remote control is desired
(TRC7 or TRC15), the Wireline guard tone frequency must be set to the
same guard tone frequency generated by the console. If tone remote
control is not used, then set the guard tone frequency to "disabled" for full
spectrum audio.
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