Quick Eagle Networks DL3800E - Manual (Page 125)

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 DL3800E.
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 DL3800E unit has more than two connected E1 circuits.
Try inverting DTE Tx clock and/or Rx clock when in v.35/RS-449 or x.21
modes.
Make sure the DTE device can handle the set DTE clocking speed.
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 support SCTE clock.
If it does not, set the clocking to SCT.
Make sure that the Transmit or Receive clock is inverted.
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 DL3800E unit 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 E1 network providing the clocking.
If the clocking is expected from a specific E1 circuit but the circuit is not in
service, set RCV 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 E1 cables are plugged into the corresponding ports on
the DL3800E.
Table 6-1 Troubleshooting (4 of 5)
Problem Solution