Oki B 4100 Maintenance Manual page 446

3 . Explanation on CN3 Terminals
CN3 Terminal
pin No. name
1 REV2 Detection and output of the direction of DC
l i n e c u r r e n t .
2 OH2 Detection of off-hook of terminal connected
to TEL-1 or TEL-2.
3 OH1 Output upon circuit current detection
after fax line seizure
4 R I 0 - 5 V signal output synchronized with the
ringing signal frequency
5 N C Unused terminal
6 PP Relay control signal for special service code
detection at parallel pickup or remote reception
7 , 8 E G N D
9, 10 sub + 5 V Sub power supply for OH2 and RI detection
11, 12 + 5 V Power supply for relays and logic circuits
13, 14 + 5 VA +5 V power supply for analog circuit
15, 16 S TX Signal
17, 18 – 5 VA – 5 V power supply for analog circuit
19, 20 R RX Signal
21, 22 SG Signal ground
23, 24 Rp Receiving sensitivity determination terminal
2 5 DP Pulse dial control signal
2 6 C M L Line seizure control signal
2 7 F. ICC Loop current control signal upon line seizure
2 8 SR Control signal for connection between LINE and
TEL terminals
2 9 PBXE Control signal for connecting one of LINE
terminal to the PBXE terminal
3 0 M U T E Control signal for pulse dial improvement and
bell shunt relay
Note *: Unused.
40055101TH Rev.4
Explanation U N C W N 5 DN5
(US.CA) (INT'L) D.A.CH)
FN5
(F.UK)
446 /