Black Box LRU4240 manual Network Problems 4

Dual Trunk E1 Router

Table 11-2 Network Problems (4 of 4)

Symptom Probable Cause Solution

The NET LED flickers intermittently between red, amber and green.

•Receiving errors on NET Port (CV, CRC, FE, etc).

•Make sure the timing source is properly configured. Timing should be set to NETWORK if the network is the source.

•If it is not the source, timing should be set to INTERNAL at one E1 end, and NETWORK at the other end.

•If you’re not sure that the network is the source, contact the network provider and discuss your circuit order. The provider will tell you if the E1 network is the source.

•If the timing source is properly configured and the NET LED continues to flicker between red, amber and green, isolate the system with the E1 test set to see if the problem clears.

•Place the E1 test set into the proper timing mode (provide timing or recover timing). You cannot use the loopback plug in this application since it would require us to provide timing and would not allow us to see if we can recover timing from a valid E1 source.

•If the NET LED continues to flicker, call Black Box Technical Support for assistance.

Dual Trunk E1 Router User’s Guide TECHNICAL: 0118 96 56 000 93