User guide

5. Troubleshooting

This section describes common mistakes and faults that may occur during installation and maintenance.

E1/T1 Alarm LEDs on

There are two groups of LEDs, PKT LOS and LOS for T1/E1 alarms LEDs.

When T1/E1 LOS LED is on, loss of T1/E1 signal fault is detected by RLH-TG Mux. Possible causes

include:

• The downstream equipment such as telephone exchange or PCM terminal is powered off.

• The T1/E1 cable connection looses or broken.

E1/T1 LOS LED blinks when respective input T1/E1 signal is AIS, i.e. the content of T1/E1 data is all 1’s.

Such alarm indicates fault conditions on the part of the downstream equipment.

E1/T1 LOS site is controlled by Dip Switch RA state. When RA Dip Switch ON, the" red LEDs

indicate remote T1/E1 LOS state. When RA Dip Switch OFF, the red LEDs indicate local T1/E1 LOS

state.

The T1/E1 PKT LOS lights are packet loss indicator, On for Ethernet packet loss, Blink for T1/E1 Packet

Loss, Off for Normal.

Lnk/Act LED off

Lnk/Act LED off means the corresponding Ethernet link is not working. Check the Ethernet cable

connection, and the status of the device on the other end of the cable.

Ready LED does not blink

After power on, the Ready LED should start to blink. If not, try switching power ON and OFF. If this error

persists, call for support.

Cannot set up T1/E1channel

Same LAN domain

When two RLH-TG Mux’s are within the same Ethernet broadcast domain, try following.

• Check if the transmission network is on.

• Check that the network will pass broadcast packets. For a network that suppresses broadcast packets, as some

of the wireless LAN bridges do, disable ARP and manually setup local and remote MAC’s.

• Check that there is no MAC address conﬂict on the LAN.

• Check that the transmission network has enough bandwidth (more than 2.5Mbps duplex).

20! RLH Industries, Inc. - 16 Channel T1/E1 over GE with Fiber! Troubleshooting