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Chapter 5 Diagnostics

The GTS 205 and GTS 250 diagnostic programs test the system hardware and detect hardware problems.

This chapter contains the following topics:

Diagnostic Routines

Diagnosing Software Problems

Service Aids

Fault Log

Diagnostic Routines

The diagnostic routines include three types of tests:

Power On Self Test (POST)
Extended POST
Menu-driven diagnostics

Running the diagnostics requires complete control of the GTS.

CAUTION:
The GTS 205 and GTS 250 stop routing when you run the diagnostics.

POST

The POST provides a basic confidence test of the GTS processor, memory, and devices.

Running POST

POST runs automatically whenever you power on the GTS. If the GTS is already powered on and you want to execute POST

: 1. Stop the GTS by unplugging the power cord from the wall outlet.
: 2. Plug the GTS into the power outlet.
: 3. Press the Reset button and hold it in a depressed state until POST starts. When this occurs, all lights light up.

As soon as you plug in the router, POST begins. During POST, the lights light in various combinations. After POST, the router boots. POST and boot take about one minute. At the end of boot, the green lights for the system (OK) and for any active port should be lit or blinking. The port lights do not light for any port that is not being used.

Errors During POST

If the GTS detects serious hardware errors during POST, it responds as follows:

If there is a terminal connected to the router, it displays the following message:
```
Power On Self Test detected a hardware failure.
Press space to execute resident extended diagnostics...
```
Press Space to display the Diagnostic Main Menu. See Menu-driven Diagnostics for information on how to use this menu.

Note: If there is a terminal attached to the router and the error is fatal, it displays a message indicating the failure, and waits for action on your part. If the error is not fatal, only the message is displayed, and no extended diagnostics are called for.
If there is no terminal connected to the router, the system "hangs" and continues to display the last POST diagnostic indicator lights pattern.

If the router does not successfully boot, run extended POST or extended diagnostics.

Extended POST

You can run an extended POST that does not require attachment of a terminal. Extended POST lets you test memory more extensively than POST and offers an optional wrap facility. Follow these steps to run diagnostics without a terminal:

: 1. Stop the GTS by unplugging the power cord from the wall outlet.
: 2. Disconnect the cables from the ports.
: 3. If you do not want to test the port drivers and receivers, go to step 4. If you want to test drivers and receivers, insert the wrap plugs into both LAN ports. For a list of the wrap plugs, see Appendix C.
: 4. Plug the router into the power outlet and, within 10 seconds, press the reset button once.

If POST completes successfully,

The green lights for the system (OK) and for any port with wrap plugs light.
The port amber lights are off.

Note: If you do not use wrap plugs, portions of the test that require them fail and the amber port lights blink.

To run the extended POST again, wait two minutes and press the reset button .

To end extended POST, power off the router by unplugging the power cord from the wall outlet.

Menu-driven Diagnostics

The menu-driven diagnostics include service aids that you can use to display the diagnostic logs and to view the vital product data (VPD).

To run the menu-driven diagnostics, follow these steps:

: 1. Attach a terminal to the GTS if you have not already done so. See Chapter 2 for instructions on how to attach a terminal.
: 2. Begin a load procedure by powering on the router or by typing reload at the * prompt and pressing Enter.
: 3. Press Ctrl C during the load procedure to display the > prompt.

The Diagnostic Main Menu appears. It has the following options:

System Diagnostics-tests the processor, the memory, and the communication ports through an internal wrap.
System Extended Diagnostics-executes the System Diagnostics tests plus external wrap tests of all ports.
WAN/LAN Wrap Menu-lets you run a wrap test on a specific port. After you select this option, additional menus help you define the wrap test.
Diagnostic Utilities-provides access to service aids. After you select this option, an additional menu lets you choose a specific service aid. See Service Aids.

If a diagnostic test fails, a message appears that gives

A description of the test that failed
A return code
An action to take

Note: The return code provides additional information that the next level of support may request.

To exit the diagnostics, type x and press Enter. The POST runs.

Diagnosing Software Problems

To diagnose software problems, you need to capture as much information about the problem as possible. The software support center can guide you through the steps needed to collect data relating to a problem; these steps can include examination of the log, trace, and dump. Your service personnel dealing with software problems should record the symptoms of the problem. Possible symptoms are:

A component stops operating, and hardware diagnostics do not identify a hardware problem.
The system stalls.
A severe drop occurs in system performance.
Data is transmitted incorrectly.
The system does not receive data that was transmitted correctly.

Service Aids

Service aids are utility programs that provide additional diagnostic assistance. The service aids for the GTS are for use under the direction of support personnel. They let you display the

Diagnostic log
Vital product data (VPD)
ROM information

Using the Service Aids

To use the service aids:

1. Start the diagnostics as described in Menu-driven Diagnostics.

2. From the Main Menu, type 4 and press Enter. The following menu appears:

Diagnostic Utilities Menu

1) Display PE Diagnostic Log Dump
2) Display PE VPD Hexadecimal Dump
3) Display ROM Information
4) Clear PE Diagnostic Log

x) Exit to Main Menu

Enter the number of your choice:

3. Select an option.

Note: The Diagnostic Log Dump is stored in a hexadecimal dump format.

Fault Log

You can also display the fault log, which gives information about the last crash of the router. To do so, type fault at the + prompt and press Enter.

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