Quick Eagle Networks DL3800E - Manual (Page 84)

4-44 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001
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To initiate a test, use the CURSOR keys to move the highlight bar to
DTE/Network Loopback or a Payload or Line Loopback on a selected
port. Use the space bar to toggle between OFF and ON until ON appears in
the display. When that selection appears in the display, move the highlight
bar to
CONFIRM , and press the Enter key. To cancel a test that is running,
move the highlight bar to DTE/Network Loopback . Use the space bar to
toggle between the options until OFF appears in the display. Move the
highlight bar to CONFIRM , and press the Enter key.
DTE/Network Loopback
The DTE/NETWORK LOOPBACK is a bi-directional loopback that loops
the received DTE signal back to the DTE and the signal from the E1
processor back towards the E1 network. This loopback is used to verify the
operation of the DTE and associated cabling.
Payload Loopback
The payload loopback is used to verify proper E1 network operation of the
DL3800E unit and the E1 network. The Payload Loopback loops the
payload data received from the E1 network back towards the network. The
data is regenerated, and a new framing pattern is inserted prior to being
looped back. In this way the E1 framing of the unit and network can be
verified.
Line Loopback
The line loopback is used to verify the operation of the E1 network. The
line loopback loops the data received from the E1 network back towards
the network. The data is regenerated prior to being looped back; however,
no additional processing of the data is done by the DL3800E. This
minimizes the impact of the DL3800E unit during this test so that network
problems can be isolated.
Local Loopback
The local loopback is used to verify the operation of the DTE and
connections. The local loopback loops the data received from the DTE back
towards the DTE at the network interface.