General DataComm SpectraComm V.34 Installation & Operation Manual page 127

Tests
ON
SD
RD
M
O
OH D
CO
E
M
TR
A
SD
RD
M
O
OH D
CO
E
M
TR
B
TM ALM
ST
AL
A
ST
AL
B
Dual
V.34
Figure 6-2
060R122-000
Issue 15
3. Enter test data at the DTE. Compare the data
that was entered at the DTE with the data that is
looped back and displayed by the DTE.
DTE
HELLO
INTER-
FACE
........
.......
2. The modem flashes the TM LED
while it is setting up the test, then lights
the TM LED while the test is running.
1. To start the test, press AL.
4. To end the test, press AL again.
Analog Loopback (Modem A)
SpectraComm Dual V.34 Modem
Installation and Operation
Analog Loopback (ANALOOP)
TX
TX
DRIVER
LOGIC
Communications
ANALOOP
Line
RX
ANALOG
LOGIC
RECEIVER
6-3