Motorola MTR2000 T5544 Instruction / Field Service Manual page 203

2-WIRE VOICE SIGNAL PATHS
P/O
LINE CONNECTOR
ON
STATION BACKPLANE
LINE 2 AUDIO
FROM STATION TO LANDLINE
AND
FROM LANDLINE TO STATION
4-WIRE VOICE SIGNAL PATHS
P/O
LINE CONNECTOR
ON
STATION BACKPLANE
LINE 1 AUDIO
FROM LANDLINE
TO STATION
P/O
LINE CONNECTOR
ON
STATION BACKPLANE
LINE 2 AUDIO
FROM STATION
TO LANDLINE
LANDLINE TO STATION VOICE AUDIO PATH
–
BUFFER
+
MATCHING MATCHING
JUMPER JUMPER
FIELD FIELD
LANDLINE TO STATION VOICE AUDIO PATH
BUFFER
MATCHING MATCHING
JUMPER JUMPER
FIELD FIELD
LINE DRIVER
+
MATCHING MATCHING
–
JUMPER JUMPER
FIELD FIELD
LINE DRIVER
+
–
PRE-EMPHASIS/
GAIN ADJUST
AMPLIFIER
AMPLIFIER
SPI LATCH BIT 0
SPI LATCH BIT 2 SPI LATCH BIT 1
LINE DRIVER
2-POLE
+ LOW-PASS
FILTER
–
LINE DRIVER STATION TO LANDLINE VOICE AUDIO PATH
–
+
PRE-EMPHASIS/ GAIN ADJUST
AMPLIFIER
AMPLIFIER
SPI LATCH BIT 0
SPI LATCH BIT 2 SPI LATCH BIT 1
2-POLE
LOW-PASS
FILTER
STATION TO LANDLINE VOICE AUDIO PATH
WL 1 LATCH CS*
MOSI/SPI CLK
SPI LATCH
PCM CODEC/
SPI LATCH BITS –
FILTER
7 6 5 4 3 2 1 0
DE-EMPHASIS
A/D
CONVERTER
SPI LATCH BIT 4/5
GAIN
ADJUST
CIRCUITRY
D/A
CONVERTER
Figure 3. CLN1204 2-Wire Voice Audio Path Func-
WL 1 LATCH CS*
MOSI/SPI CLK
SPI LATCH
PCM CODEC/
SPI LATCH BITS –
7 6 5 4 3 2 1 0 FILTER
DE-EMPHASIS
A/D
CONVERTER
SPI LATCH BIT 4/5
D/A
CONVERTER
GAIN
ADJUST
CIRCUITRY
Figure 4. CLN1204 4-Wire Voice Audio Path Func-
68P81096E28-C
09/30/05
CLN1204 Wireline Interface Board
SPI BUS/ CHIP
SELECT FROM
SCM
PCM VOICE
AND DATA
TO SCM
PCM VOICE
AND DATA
FROM SCM
tional Block Diagram
SPI BUS/ CHIP
SELECT FROM
SCM
PCM VOICE
AND DATA
TO SCM
PCM VOICE
AND DATA
FROM SCM
tional Block Diagram
7