P
AGE
4
44023-1297 <90-00058>
F
IG
. 1 - F
UNCTIONAL
S
CHEMATIC
, 44023 PABX/T
RUNK
I
NTERFACE
M
ODULE
, A
UDIO
S
ECTION
CIRCUIT DESCRIPTION
2
T1
4
LINE RCV
-8VDC
OUT
IN
T2
TEST
JACKS
DROP/
MON
7
13
DROP RCV
XMT
PAD
23dB
-8VDC
9
10
11
8
36
32
38
40
41
T3
47
42
35
17
XMT LEVEL ADJ
R24
OUT
RCV
PAD
23dB
IN
-8VDC
T4
51
53
TEST
JACKS
DROP/
MON
-8VDC
-20/-18
POWER
SUPPLY
REGULATOR
-10/-8
POWER
SUPPLY
REGULATOR
-18 VDC
TP 10
-10 VDC
-8 VDC
TP 9
PINS
MON
RCV OR
XMT
TO
MODULE
CIRCUIT
JACK
DETAIL
DROP
XMT
-8VDC
RCV LEVEL ADJ
R5
LINE
RCV
SUMMING
INPUTS
MUTE
BUSY TONE
BUSY TONE
ENABLE
ALERT TONE
OFF-HOOK
TONE ENABLE
OFF-HOOK
OK TONE
ON-HOOK
OK TONE
ON-HOOK
TONE ENABLE
GND
RCV DIST
XMT DIST
DISTRIBUTION
OUT
LINE XMT
LINE XMT
-20 VDC
-8VDC
-BATT
(-21 TO -56 VDC)
