Oki OKIFAX4550 Maintenance Manual page 357

3. Explanation on CN3 Terminals
CN3 Terminal
pin No. name
36 OH2 Detection of off-hook of terminal connected
to TEL-1 or TEL-2.
40 RI 0 - 5 V signal output synchronized with the
ringing signal frequency
24 PP Relay control signal for special service code
detection at parallel pickup or remote reception
13, 14, GND Ground
41, 42
37, 38 sub + 5 V Sub power supply for OH2 and RI detection
33, 34 + 5 V Power supply for relays and logic circuits
43 + 5 VA +5 V power supply for analog circuit
44 S TX Signal
45 – 5 VA – 5 V power supply for analog circuit
48 R RX Signal
46, 47, SG Signal ground
49
50 Rp Receiving sensitivity determination terminal
22 DP Pulse dial control signal
20 CML Line seizure control signal
30 F. ICC Loop current control signal upon line seizure
28 SR Control signal for connection between LINE and
TEL terminals
18 MUTE Control signal for pulse dial improvement and
bell shunt relay
Note *: Unused.
41309401TH Rev.4
Explanation EN9 INU
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