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Items
(F)
Hookswitch
*
Check with DC
Characteristics
(G)
DTMF Generator
*
Confirmation
Adjustment
Point
1. Connect J1 (Telephone Socket) to Tel-simulator which is connected with 600
-
2. Set line voltage to 48V at on-hook condition and line current to 40mA at off-hook
condition of nomal telephone.
3. Execute the command "hookoff"
4. Confirm that the line current is 40mA ± 5mA.
5. Execute the command "hookon".
6. Confirm that the line current is 0mA + 0.2mA.
1. Connect J1 (Telephone Socket) to DTMF tester.
-
2. Execute the command "hookoff" and "dtmf_up".
3. Confirm that the high frequency (1477.06Hz) group is -6.5dBm ~ -9.5dBm.
4. Execute the command "dtmf_lo".
5. Confirm that the low frequency (852.05Hz) group is -9.0dBm ~ -12.0dBm.
Procedure*
46
Check
.
IC2,R7,R8,
R9,R10,R77
Q2,Q3,D2,
C1,C2,C52
IC2,R32,C2
R23,C90,C5
C14,C13,Q
R22,R21,R1
R20,C12,D2
C1,C2,R77
D3,R12,Q2
R7,R8,R9,
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