Digital Link DL3800 DS1, Руководство пользователя

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Diagnostics 6-7
6
The connected DTE device
shows intermittent errors. Run a DTE/NET Loopback to verify the physical connection between the
local DTE device and the DL3800.
If errors are reported during this loopback, check the DTE cable.
Make sure the DTE device supports the DTE port clocking option.
Use SCTE clocking for the DTE device if the application is using V.35, and
the DL3800 has more than four connected T1 circuits.
Make sure the DTE device can handle the set DTE clocking speed.
The T1 ports on a DL3800
cannot be put into network
loopback from the carrier. Make sure the carrier is sending a standard loop up code of 10000 to the
T1 port.
Make sure SET/RESET is enabled for each T1 port in the NETWORK
CONFIGURATION MENU.
The DTE/NETWORK
Loopback does not work
towards the locally
connected DTE device. Make sure the DTE device can run to a DCE in loopback.
If configured for SCTE, the DTE device must be able to recognize an inverted
clock. If it does not, set the clocking to SCT.
Make sure the DTE device does not need to see RLSD (RECEIVE LINE
SIGNAL DETECTED) during this loopback. If it does, set RLSD in the DTE
CONFIGURATION MENU to ASSERT this lead.
The DL3800 has timing
and synchronization
problems. Make sure the timing source is set properly.
If the clock source is provided by the circuit provider, set XMT PRIMARY
CLOCK SOURCE to Net, and RCV to the T1 network providing the clocking.
If the clocking is expected from a specific T1 circuit but the circuit is not in
service, set XMT PRIMARY CLOCK SOURCE to AUTO.
If the clock source is not provided by the circuit provider, set XMT PRIMARY
CLOCK SOURCE to INT and the remote unit XMT PRIMARY CLOCK SOURCE
to NET, and RCV to AUTO.
Make sure the proper T1 cables are plugged into the corresponding ports on
the DL3800.
Table 6-1 Troubleshooting (4 of 5)
Problem Solution