Allied Telesis AT-9410GB Installation Manual page 60

Troubleshooting
60
acceptable limits. For specifications on the transceiver in the GBIC
module, refer to the GBIC Installation Guide.
Check that the operating specifications (for instance, wavelength
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and maximum operating distance) of the fiber optic port on the
remote end node are compatible with the fiber optic port on the
GBIC module. For example, you cannot connect a GBIC module
with a maximum distance of 40 kilometers and a wavelength of
1550 nanometers (nm) to a remote fiber optic port with an
maximum distance of only 10 kilometers and a wavelength of
1310 nm.
Verify that the remote fiber optic port is operating at 1000 Mbps
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and in full-duplex mode. The 1000 Mbps operating speed of the
GBIC module is fixed and cannot be changed.
If you are unable to establish a local management session with the
switch through the RS-232 Terminal Port on the front panel, do the
following:
Check to be sure that the RS-232 cable is securely connected to
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the RS-232 Terminal Port on the switch and to the RS-232 port on
the terminal or personal computer.
Check to be sure that you are using the null modem management
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cable.
Check to be sure that the operating parameters on the terminal or
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the terminal emulation program, if you are using a personal
computer, have been set correctly. The default settings for the
RS232 Terminal Port can be found in Starting a Local
Management Session on page 54.