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Figure 3-3. Self Test
Figure 3-4. Transmit Test Pattern
DTE
TEST PATTERN TRANSMITTER
ERROR CHECK RECEIVER
PAD
Modem
Self Test Mode
4-Wire Tele
p
hone Line
Self Test
TM
TX
RX
Am
p
lifier
DTE DTE
TEST
PATTERN
TRANSMITTER
ERROR
CHECK
RECEIVER
Local Modem
Send Test Pattern Mode
2-Wire Tele
p
hone Line
Remote Modem
Receive Test Pattern Mode
TM
Transmit Test Pattern
SPEED SELECT