Motorola MTR2000 T5544 Instruction / Field Service Manual page 210

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
PRE-EMPHASIS/
AMPLIFIER
–
BUFFER
+
SPI LATCH BIT 0
SPI LATCH BIT 2
LINE DRIVER
+
–
LINE DRIVER
–
+
LANDLINE TO STATION VOICE AUDIO DATA PATHS
PRE-EMPHASIS/
AMPLIFIER
BUFFER
SPI LATCH BIT 0
SPI LATCH BIT 2
SPI LATCH BIT 1
LINE DRIVER
+
–
2-POLE
LOW-PASS
LINE DRIVER FILTER
–
+
STATION TO LANDLINE VOICE AUDIO DATA PATHS
SPI LATCH
SPI LATCH BITS – 7 6 5 4 3 2 1 0
GAIN ADJUST
AMPLIFIER
DE-EMPHASIS
SPI LATCH BIT 4/5
SPI LATCH BIT 1
2-POLE GAIN
LOW-PASS ADJUST
FILTER CIRCUITRY
STATION TO LANDLINE VOICE AUDIO PATH
GAIN ADJUST
AMPLIFIER
DE-EMPHASIS
SPI LATCH BIT 4/5
VOICE
GAIN
ADJUST
CIRCUITRY
SPI LATCH BIT 3
SPI LATCH
SPI LATCH BITS – 7 6 5 4 3 2 1 0
68P81096E29-F
09/30/05
CLN1203 Wireline Interface Board
WL 1 LATCH CS*
SPI BUS/ CHIP
SELECT
MOSI/SPI CLK
FROM SCM
PCM CODEC/
FILTER
PCM VOICE
AND DATA
TO SCM
A/D
CONVERTER
PCM VOICE
AND DATA
FROM SCM
D/A
CONVERTER
Figure 3. CLN1203; 2-Wire Voice Audio Path
Functional Block Diagram
PCM CODEC/
FILTER
PCM VOICE
AND DATA
TO SCM
A/D
CONVERTER
D/A
CONVERTER
PCM VOICE
AND DATA
FROM SCM
WL 1 LATCH CS*
SPI BUS/ CHIP
SELECT
MOSI/SPI CLK
FROM SCM
Figure 4. CLN1203; 4-Wire Voice Audio Data
Path Functional Block Diagram
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