User guide

Diagnostics and Troubleshooting 6-21
6
¥ If you have eliminated the above as a cause, place your data test set on the problem
portÑif the TD/RD LEDs do not light, call Digital Link technical support for
assistance.
The Data Port RTS/CTS LEDs do not Illuminate
¥ If your system does not support the RTS or DTR protocol, set the port DTE loss to
None (defaultÑRTS) in Menu-2 Data DTE ConÞguration menu. See ConÞguring the
Data Ports on page 3-19.
The CTS LED should light and remain lit.
RTS and DTR are signals sent from the DTE device connected to the Data Port.
¥ Run a lamp test from Menu-9 Diagnostics to make sure the LEDs are working.
¥ If the CTS LED still does not illuminate, call Digital Link technical support for
assistance.
The DTE Device Shows Intermittent Errors
¥ If your T1 line is conÞgured for AMI line coding, place the Data Port in the forced
operation mode.
This ensures that your DTE device meets ones density and does not allow errors to
be transmitted in place of live data.
¥ You may have a timing error. Refer to There is no FDL Communication with the
Remote/far End System on page 6-17.
¥ If the DTE device is the timing source, set the data port as the source. You need a
special DTE cable to enable you to conÞgure the system as a DTE device. Use a cable
appropriate to your application (V.35 or RS-449).
¥ Running a DTE Loopback test is useful here.
¥ If the cable and the timing are correct, place a data test set at both ends of the T1 line
in place of the DTE devices to see if the errors continue. The DTE loopback should
be good here.