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Chapter 4
Troubleshooting
Troubleshooting the Installation
This section provides a checklist for resolving problems associated with
your AT-4016F and cabling.
The first rule of troubleshooting is to isolate the problem. As you
experiment, only vary one factor at a time. Substitute known good
equipment and see if the problem persists or is eliminated.
As a preliminary check, perform the following steps
1.
Do not overlook the obvious—check diagnostic LEDs and make
sure the cables and connectors are securely attached.
2.
If there is no power indication, check that the power plug is
properly seated at the AT-4016F switch and at the AC receptacle.
LED Indicators
The following are suggested courses of action in response to specified LED
indicator conditions:
Power Supply
LEDs
❑
If PS Fail 1 or PS Fail 2 lights up, you may have a failure in one
of the removable power supplies. Replace the affected power supply
and check the indicator again.
ATM Media
Module LEDs
❑
If the ATM FAIL indicator lights. Replace the module.
❑
If the ATM TIMING indicator is not lighted. Reconfigure the ATM
channel through the Omega management agent and at the
corresponding ATM port at the other end of the segment. Make
sure the channel definitions are compatible.
❑
If the ATM LOS indicator lights. Check the ATM Media
Channel connections at both ends of the cable. Since you are only
using optic media, try exchanging the Transmit (TX) and Receive
(RX) connectors and check whether the LOS light stays lighted.
❑
If the ATM SYNC indicator is not lighted. There may be a cable
problem or a configuration problem.
