L-Switch User Manual
37
LOYTEC
Version 6.0
LOYTEC electronics GmbH
8 Troubleshooting
8.1 TP-1250 port does not work
Problem
Messages are not forwarded to or from the TP-1250 port(s). All other ports work properly.
Explanation
This problem might be due to mixing collision-less backbone mode and standard backbone
mode devices on one channel.
Solution
If the TP-1250 channel is used in collision-less backbone mode make sure all devices on the
network have collision-less backbone mode enabled, only L-Switch XP devices are
connected to this backbone and every L-Switch XP has a unique station ID set.
If the TP-1250 channel is used in standard backbone mode make sure that all L-Switch XP
devices have the collision-less backbone mode disabled.
8.2 One or more port LEDs are flashing red
Problem
One or more port LEDs are flashing red whenever there is traffic on the channel (instead of
green).
Explanation
The L-Switch XP has built-in network analysis functionality (see Section 5.4): Whenever it
detects a potential problem on one port, the corresponding activity LED will change its
color to red.
Solution
Most likely this behavior is due to a wiring problem. Check the wiring and termination of
the network connected to the affected port. If this does not solve your problem use a
protocol analyzer (e.g. LOYTEC’s LPA) and/or a network diagnostics tool (e.g. LOYTEC’s
LSD Tool or Echelon’s Nodeutil) to find the source of the problem.