Appendix E - Upgrades and Troubleshooting
364
BLACK BOX
®
Advanced Console Server
First, type Ctrl-D to see the X in the DTR column move position, then type Ctrl-R to see the X
in the RTS column change position. If each of the Xs moves in response to its command, the
signals are being sent. Another method to test the signals is to use a loop-back connector.
Enter the number of the port with the loopback connector and start the test. In this case,
when Ctrl-D is typed, the Xs in the first three columns will move as shown below.
Figure 40: Second screen, showing changed positions
This is because the test is receiving the DTR signal sent through the DCD and DSR pins.
When Ctrl-R is typed, the Xs in the RTS and CTS columns should move together. If the Xs
change position as described, the signals are being sent and received correctly.
Single User Mode
The BLACK BOX
®
Advanced Console Server has a single user mode used when:
•
The name or password of the user with root privileges is lost or forgotten,
•
After an upgrade or downgrade which leaves the BLACK BOX
®
Advanced Console
Server unstable,
•
After a configuration change which leaves the BLACK BOX
®
Advanced Console Server
inoperative or unstable.
Type the word “single” (with a blank space before the word) during boot using a console con-
nection. This cannot be done using a telnet or other remote connection. The initial output of
the boot process is shown below.
Entry Point = 0x00002120
loaded at: 00002120 0000D370
relocated to: 00300020 0030B270
board data at: 003052C8 0030537C
relocated to: 002FF120 002FF1D4
