Troubleshooting

Table Of Contents

Troubleshooting

Basic Diagnostic Procedures

Isolating the Problem

Reading the Front Panel LEDs

Password Recovery

Technical Support

Troubleshooting

This chapter discusses basic fault investigation and diagnostic (troubleshooting) procedures for the Cisco ONS 15501.

This chapter includes the following sections:

• Basic Diagnostic Procedures

• Isolating the Problem

• Password Recovery

• Technical Support

Basic Diagnostic Procedures

When a problem occurs over the network, use the following three basic diagnostic procedures to determine if the Cisco ONS 15501 is the source of the problem:

•Verify the power connection.

•Verify the Ethernet connection.

•Verify the alarm connection.

To verify the power connection, follow these steps:

Step 1 Make sure that power is securely connected to the unit and that external DC power is being applied.

Step 2 Check for LED lamp activity on the front panel. Disregard the color or number of LEDs illuminated at this time. Verify only that one or more is on, indicating that the chassis is receiving power.

Step 3 Check the following areas for possible problems if no LEDs are on:

•Verify that the power connection to the chassis is firmly made.

•Verify that the circuit power switch(es) are in the on position.

•Verify that the external source DC power circuit breaker(s) are on.

•Verify that the external power wires are delivering power correctly.

To verify the Ethernet connection, follow these steps:

Step 1 Make sure that the RJ-45 connector is in good working condition; then plug it into the LAN port.

Step 2 Check for LED activity on the LAN port. The left LED is green when an Ethernet connection is established. The right LED flickers yellow when a signal is being transmitted to the Ethernet.

Step 3 Check the following areas for possible problems if no LEDs are on:

•Verify that the RJ-45 connection to the chassis is firmly made.

•Verify that the RJ-45 connector is in good working condition.

•Verify that the external Ethernet source is on and delivering a signal.

To verify the alarm connection, connect an ohmmeter to the Alarm Out port, through an RJ-45 connector.

If the ohmmeter shows a reading of any kind, a connection is present. A very high resistance reading indicates that there are no alarm conditions; a low resistance reading indicates that alarm conditions do exist. See "Connector Pinouts."

Isolating the Problem

The key to troubleshooting the Cisco ONS 15501 is to isolate the problem to a specific component.

When troubleshooting, consider the following components of the Cisco ONS 15501:

•Power supply — Includes the power input wiring and associated switches and fuses.

•Cooling system — Includes the fan, which should go on when power is supplied. The air intake vents and exhaust vents must have adequate ventilation.

•Front panel indicators — Includes the LEDs on the front panel, which help to identify a failure.

•Connecting cables — Includes all of the interface cables that connect the equipment to any transmission circuit or external device.

Reading the Front Panel LEDs

The front panel LEDs provide the activity or alarm status of the interfaces or internal circuitry to which they correspond. If an LED is connected to an active circuit and registers an alarm condition or is not on, a problem may exist. Table 5-1 lists the front panel LEDs and what the conditions indicate.

Table 5-1 shows the Cisco ONS 15501 front panel.

Table 5-1 Cisco ONS 15501 Front Panel LEDs

LED

Status

Description

Power

Green

Power is on.

Fail

Red

Component failure.

LOS¹

Yellow

No signal is detected.

¹Loss of Signal

If all LEDs on the front panel are off:

•Check that primary and user-optional external power is available and that the DC power wiring is properly and firmly connected to the appropriate screw terminals.

•Check that the external DC supply power switch is turned to the on position.

If the Power LED blinks green, one of the two power supplies has failed or is not installed.

If the Power LED is green but the unit has failed and no other LEDs are on, then the internal power regulating circuit may have failed. Contact the Cisco Technical Assistance Center (TAC) immediately for assistance.

If the Fail LED is red, then a major trouble condition exists in the Cisco ONS 15501 hardware. Contact the Cisco Technical Assistance Center (TAC) immediately for assistance.

Warning Infra-red laser energy may be present on the cable connected to the receiving (Input) connector, at the transmitting (Output) optical fiber connector, or the monitoring (Optical Monitor) connector. To avoid potential damage to the eyes, do not look directly into this connector or cable. When an optical cable is not attached, place the supplied protective cap over the connector and the optical fiber cable.

If the LOS (loss of signal) LED is yellow, then the input optical signal has disappeared or has fallen below the detection level.

•Check to see that the input optical cable is securely seated in its connector.

•Connect an optical power meter on an optical spectrum analyzer to the Output Monitor optical connector and check for proper level of the outgoing signal.

•Check with the distant transmitting end to determine if the signal is leaving that site at the proper level.

•Check that the input power mean and trigger values are configured correctly for the actual desired input signal.

Password Recovery

If you have forgotten your passwords, you must power cycle the system and use the restore command to reset the passwords to the defaults. The restore command can only be entered from a session on the serial port, not from a Telnet session.

Caution Be sure not to lose the passwords. Powercycling the system disrupts data flow.

To recover the system passwords, follow these steps

Step 1 Power cycle the system.

Step 2 From a HyperTerminal session on the console port, press the Enter key within 15 seconds after the password prompt appears.

Step 3 At the "edfa >" prompt, type the restore command and press the Enter key.

Step 4 Answer yes to command prompts and press the Enter key.

The default user password is edfa and the default master password is edfa1. For security reasons, you should change both passwords as soon as possible. Log in with master privileges and use the set-user-pwd and set-master-pwd commands to change the passwords.

Technical Support

If the problem exists after you review the Cisco ONS 15501 status and attempt to reprovision the amplifier, contact the Cisco Technical Assistance Center (TAC). (See the Preface for contact information.)

LED	Status	Description
Power	Green	Power is on.
Fail	Red	Component failure.
LOS¹	Yellow	No signal is detected.