User`s guide

Diagnosing the DL600E Unit 6-7
You can perform the Loop DTE only if the DTE equipment has a feature to
send and detect a test pattern. The
DTE equipment sends the full
bandwidth signal through a
4000 foot (1220 meter) simulated line to the
DL600
E1 network receive circuitry. It should receive the same signal it
transmitted. The
E1 network transmitter continues to transmit toward
the network while the DL600E unit is in
DTE loopback.
E1 transmission is interrupted during the test.
D
Note: You do not need to inform the phone company before
running this test. However, you should inform them if the
test results indicate a phone company problem, or require
the DL600E unit to be removed from service.
Figure 6-2 Loop
DTE Test
Loop NET Test
The Loop NET test veriÞes the operation of the E1 network and is
available only with full bandwidth. It loops the data received from the
E1
network back to the network. The data is regenerated before it is
looped back, however, the unit does not perform additional processing
of the data. This minimizes the impact on the DL600E unit during the
test so that network problems can be isolated.
Figure 6-3 Loop NET Test
Network
Interface
DATA
Port
DATA
Port
Network
Interface
Remote Solo E1 EncoreLocal Solo E1 Encore DTE
DTE
DATA
Port
Network
Interface
DATA
Port
Network
Interface
Remote Solo E1 EncoreLocal Solo E1 Encore
DSU DSU