Specifications

Hardware Reference 41
Software Release 3.0.2
C613-03092-00 REV C
Diagnostics
Software for AT-8900, AT-9900, and AT-9900s switches includes a set of
diagnostic programs that perform basic checks of all system components.
These diagnostics do not run with normal operating code and require that the
system be totally dedicated to their use. The switch does not perform switching
operations when diagnostics are running.
Caution Diagnostics are designed to be run by service personnel only. This
section is not intended as a guide to diagnostics software. Detailed knowledge
of how the switch hardware functions is necessary in order to effectively use
diagnostic programs. For more information, contact your authorised distributor
or reseller.
Enabling
diagnostics mode
1. Connect a terminal to the RS-232 terminal port (ASYN0).
Use a terminal cable to connect a terminal to the RS-232 port (ASYN0) on
the switch. For more information on terminal cables, see “RS-232 Terminal
and Modem Cables” on page 29.
Set the terminal communication parameters as follows:
•Baud rate: 9600
• Data bits: 8
•Parity: None
• Stop bits: 1
•Flow control: Hardware
2. Restart the switch.
To restart the switch, use a small diameter pin to press the recessed Reset
button on the front panel of the switch. You can also log in at the terminal
and enter the command:
restart reboot
How to log in is described in the Installation and Safety Guide.
3. Enable diagnostics mode during self-tests at startup.
The switch pauses briefly during its self-tests to allow an override.
For AT-8900 and AT-9900 switches, the following prompt is displayed:
Force EPROM download (Y)?
For AT-9900s switches, the following prompt is displayed:
Boot fallback software (Y)?
Press Ctrl+D to enable diagnostics mode. Press Ctrl+D once only to ensure
you send no other characters to the switch.