MTR3000 Wireline: Basic Troubleshooting 8-17
8.4.2 Tone Remote Control
A tone sequence must meet specific requirements for timing, amplitude, and frequency to be
considered valid. The timing requirements for a tone sequence are defined in Figure 8-7. All tone
sequences must include a minimum of 120 mS of high level guard tone and 40 mS of function tone.
i.e. Function tone is required (even on single frequency systems).
Low Level Guard Tone (LLGT) is not required. This allows the console to change frequencies or
manipulate alternate CPS defined GPIO functions without keying up the base station/repeater. When
Low Level Guard Tone is present (at the end of a tone sequence), the base station/repeater will key
up and remain transmitting for as long as LLGT is present.
Figure 8-7 Timing requirements for a Valid Tone Remote Control Sequence
The required amplitude for HLGT in absolute terms is determined by the Wireline Tx Level alignment
process. Refer to Section 13.5.4 on page 13-10. HLGT is expected to be 6 dB above the Test Tone
level used in the alignment process. Function Tone is expected to be 4 dB below the Test Tone Level
and LLGT is expected to be 24 dB below the Test Tone level. Refer to Figure 8-8. The HLGT Detect
and LLGT Detect LEDs on the front of the board may be used to determine if the Wireline is
detecting the proper levels.
High Level Guard Tone
(HLGT)
120mS
Function
Tone
40mS
Low Level Guard Tone (LLGT)
Variable
Mixed with Speech
(Optional)
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