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Figure 3-1. Analog Loopback Test
Figure 3-2. Digital Loopback Test
Fi
g
ure 1 - Analo
g
Loo
p
back Test
DTE
DTE
RECEIVER
TRANSMITTER
PAD
TRANSMITTER
RECEIVER
Local Modem
Analo
g
Loo
p
Back Mode
RXD
TXD
4-Wire Tele
p
hone Line
Remote Modem
Data Mode
Amplifier
Di
g
ital Loo
p
back Test
DTE DTE
RECEIVER
TRANSMITTER
TRANSMITTER
RECEIVER
Local Modem
Local Di
g
ital Loo
p
Back Mode
4-Wire Tele
p
hone Line
Remote Modem
Data Mode