User manual

Chapter 7. Test Menu
61202156L1-1 TDU 120e User Manual 7-9
Port Test Menu Items Nx/DBU (0.1)
Nx/DBU (0.1) is the base Nx interface. It offers the following
test functions:
DTE LOOPBACK
This initiates a loopback. The following options are available:
PORT/LOCAL
The Nx port activates both a Local loopback (back toward the
DTE) and a Port loopback when either is invoked.
REMOTE
The remote loopback causes a channelized V.54 code to be
sent to the far end. The Nx at the far end activates a PORT/
LOCAL loopback upon detection of the V.54 code.
OFF
The loop is deactivated.
REM V.54 Cont.
The remote loopback causes a continuous V.54 code to be sent
to the far end. The Nx at the far end activates a PORT/
LOCAL loopback upon detection of the V.54 code.
The execution of Port Tests will disrupt normal data flow in the
port tested.
The TDU 120e checks the remote loopback activation by detecting
a proper response from the remote end. While waiting for the re-
sponse, the display shows
L
OOPING
. If successful, the display
changes to
L
OOPED
-U
P
. If unsuccessful, the display shows
F
AILED
.