Service manual

Chapter 15
15-58
Relay Test
Press '1' on the keypad on the Modem NCU Test menu to select relay test mode. Use the keypad to operate the various
relays of the NCU.
The LCD is turned on or off in relation to the transmission of the relay operation signal as is operated on the keypad;
for this reason, you cannot use the LCD to check a fault on a single relay.
F-15-37
Frequency Test
A press on '2' on the keypad from the MODEM NCU Test menu selects the frequency test.
In this test, signals of the following frequencies from the modem are transmitted using the telephone line terminal
and the speaker. To select a different frequency, use the keypad.
T-15-34
Tonal signal reception test Use it to monitor a specific frequency and the DTMF
signal received from the telephone line terminal by
causing them to be indicated on the LCD (i.e., the
presence/absence as detected). The reception signal is
generated by the speaker.
V.34 G3 signal
transmission test
The modem sends V.34 G3 signals from the modular jack
and speaker.
Keypad Frequency
1 462 Hz
2 1100 Hz
3 1300 Hz
4 1500 Hz
5 1650 Hz
6 1850 Hz
7 2100 Hz
Type Description
RELAY 1 010000
1-1 : P ON
1 : relay ON
2 : relay OFF
0 1 0 0 0 0
Relay CML P S H D R
Keypad 0 1 2 3 4 5