Oki OKIFAX OF-38 Field Service Manual - page 46
of
284
Item
Specifications
90
Ring Detection Sensitivity
1) Voltage range
40 volts to 150 Vrms
No operate below 17 volts
2) Frequency range
3) Ring detection time
One-ring to 30 seconds
* Adjustable in 5 seconds
4) Ring voltage duration
Longer than 180 ms
.
No operate 90 ms or less
Note:
The ring-detect circuit will not activate on dial
pulses
pps, dial tone, or other spurious
noises on the telephone line.
91
Local Diagnosis
The OF-38 provides the following test items as the local
diagnosis.
1) Sensor test
2)
Input port test
3)
ROM checksum test
4)
ROM version check
5)
RAM validity test
6) Encoding/decoding test
7)
High-speed MODEM test
8)
Low-speed MODEM test
9)
Tone transmission test
10) Buzzer test
11) LED test
1 2 )
13)
Character LCD display test
2 - 3 3