Oki B4100 - Manual (Page 457)

40055101TH Rev.4 457 /
Figure A3.7.4 Block Diagram of DN5
CN2
TEL1
S1-1~2
TEL2
CN1
8
SR
CML
RL
2
7
2 Loop Current Detection
LPF 16 KHz
OH1
RL
1
P
RL4
PBXE
LINE
AR
1
RL
7
IC
2
F
F
C
1
I
IC
1
D
J
S1-4
S4-1~2
C31
C
R590
C
11
T
1
E
B
RL
3
MUTE
DB1
IC5
IC7
90
DP
MUTE
DC circuit
4
3
5
G
S4-3, 4
M
IC501
1/2
S4-7, 8
S4-5, 6
IC501 2/2
N
IC502
LPF 16 KHz
R Rp S RI OH2
Impedance matching NT
Receiving sensitivity Adj
L
L7, L8, C7, C507, C9
6
(1/2)
CN2 (2/2)
TEL
arresters
OFF-HOOK
Detector
Ring
Detector
OH1
OH1
to Modem
A
RL6
PP
O
CN3
K