Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
15
3.2 Operation terminal problems
3.2.1 Information cannot be entered from the console or does not appear
correctly
If a problem occurs during connection to the console, check the problem and take action
according to the following table.
Table 3-1 Problems occurring during connection to the console and action to take
No. Failure description Items to check
1 Nothing is displayed on
the screen.
Perform the following procedure:
1. Make sure the ST1 LED on the front panel of the Switch is green. If it
is not, see 1.2 Overview of failure analysis for the entire Switch or a
part of the Switch.
2. Check whether the cables are connected correctly (for example,
check for incomplete insertion).
3. Make sure an RS-232C cross cable is being used.
4. Make sure the communication software settings, including port
number, communication speed, data length, parity bit, stop bit, and
flow control, are specified as follows:
Communication speed: 9,600 bps (or the set value if you have
changed this value)
Data length: 8 bits
Parity bit: None
Stop bit: 1 bit
Flow control: None
2 Key entry is not accepted. Perform the following procedure:
1. Data transmission might have been interrupted by XON/XOFF flow
control. End the interruption by pressing Ctrl+Q. If the Switch still
does not accept entry from the keys after this operation, perform
steps 2 and 3.
2. Make sure that the communication software settings are correct.
3. The screen might not be responding because Ctrl+S was pressed.
Press any key.
3 Unexpected characters
are displayed at login.
Negotiation with the communication software might not have been
performed correctly. Check the software communication speed by doing
the following:
1. If the communication speed of CONSOLE (RS-232C) was not
specified by using the line console speed operation command,
make sure that the communication speed of the communication
software is set to 9,600 bps.
2. If the communication speed of CONSOLE (RS-232C) has been set
to 1,200, 2,400, 4,800, 9,600, or 19,200 bps by using the line
console speed operation command, make sure that the
communication speed of the communication software is set correctly.
4 Unexpected characters
are displayed when
entering a user ID.
The communication speed of CONSOLE (RS-232C) might have been
changed. See No. 3.