Encore 24 PORTS NWAY SWITCHING HUB User's Guide download pdf (Page 142)

6-20 Encore Multi-port DSU/CSU User GuideÑJuly, 1997

¥ If, after all above steps have been satisÞed, your DSU/CSU still shows a yellow

NET LED, call Digital Link technical support for assistance.

The NET LED Flickers Intermittently between Red, Amber, and Green

¥ Make sure the timing source is properly conÞgured. 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 T1 end, and

NETWORK at the other end.

If youÕre not sure that the network is the source, contact the network provider and

discuss your circuit order. The provider will tell you if the T1 network is the source.

¥ If the timing source is properly conÞgured and the NET LED continues to ßicker

between red, amber and green, isolate the system with the T1 test set to see if the

problem clears.

Place the T1 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

T1 source.

¥ If the NET LED continues to ßicker, call Digital Link technical support for

assistance.

The Data Port TD/RD LEDs do not Illuminate

¥ Make sure the DTE cable is plugged into the appropriate connector on the back of

the DSU/CSU. The connectors are labeled port one, port two, etc., depending on

your system type.

¥ Check the timeslot allocation to make sure bandwidth is allocated to the speciÞc

data port.

¥ Run a lamp test from Menu-9 Diagnostics to make sure the LEDs are working.

¥ Make sure the DTE devices connected physically to the DSU/CSUs are sending data

to each other. The serial line will not transmit data or receive data if it is shut down.

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Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 142