Gai-tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telep Instrukcja Użytkownika Pobierz pdf (Strona 19)

PL1877A Microprocessor Radio Telephone Interconnect Installation

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Internal Diagnostics

Test 1 – TX Softpot Adjustment

This test activates both the PTT and the PL strip output, accesses the phone line and generates 1000 Hz

to the phone line and transmitter. The

UP or DOWN buttons are used to adjust the TX softpot, UP

increases the TX level and

DOWN decreases the level. As the UP or DOWN button is pressed the value

stored in gain stage U18 is displayed via the LEDs in binary form. When the

PATCH ON/OFF button is

pressed to exit Test 1, the TX softpot is set at the indicated TX level number. The TX softpot remains at

this value permanently unless it is again changed through Test 1.

Test 2 – DTMF Decode Thresholds

Test 2 accesses the phone line and generates each of the 16 DTMF digits. The tones are generated at six

different levels. The PL1877A decodes its own DTMF, and the decoded digits are indicated on the five

least significant LEDs in binary form. Refer to the LED assignment diagram below. The most

significant LED indicates that the digit being generated has been decoded.

Digit cycling may be slowed down by pressing the

DOWN button once or frozen by pressing the DOWN

button a second time. Pressing the

UP button speeds up the cycling process.

OTE: A DTMF “0” is displayed as hexadecimal 10 (decimal 16) in binary.

Test 3 – Mobile-to-Phone Audio Path

This test accesses the phone line and routes mobile audio to the phone lines with autoleveling. Decoded

DTMF from the mobile is displayed via the 5 least significant LEDs in binary format. 15 dB of RX

audio attenuation may be toggled

ON or OFF by pressing the UP button. When test 3 is entered, the

attenuator is in the state required by parameter 2.

Pressing the DOWN button toggles the state of the RX audio 6 dB per octave de-emphasis. When Test 3

is entered, the de-emphasis is in the state required by parameter 1. The three most significant LEDs

(refer to the LED assignment diagram above) are used to indicate the state of the following:

• Carrier Detect Input - LED 1 (bit 7)

• RX VOX - LED 2 (bit 6)

• Internal Squelch Detection - LED 3 (bit 5)

If the LED is lit, the input is active, if the LED is not lit the input is inactive.

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Gai-tronics MRTI 2000 (No. PL1877A) Microprocessor Radio Telep Instrukcja Użytkownika Strona 19