Specifications
Table Of Contents
- AT-8900 Series Hardware Reference
- Contents
- Models Covered By This Reference
- Why You Should Read This Reference
- Where To Find More Information
- Hardware Description
- Online Documentation
- AT-TFTP Server
- Using Windows Terminal and Windows Hyperterminal
- Switch Start-up
- RS-232 Terminal Port (ASYN0)
- Useful Cables
- Test Facility
- Power Supply Units (PSUs)
- Port, Connector, and Cable Combinations
- Troubleshooting
- Expansion Options
- Restricted Procedures
- Contacting Us
26 AT-8900 Series Switch
C613-03075-00 REV A
PSU and FOM LEDs
Check these first
1. Check the power cord connections.
2. Check that the power supply voltage is stable.
3. Check that the correct data cables are being used and that their connections
are secure.
4. Make sure that other network devices are working properly.
5. Use the SHOW INSTALL command to check that the latest software release
is loaded. See the AT-8900 Series Software Reference for more information
about obtaining the latest software release.
6. If the switch is malfunctioning, reboot it by pressing the recessed Reset
button or entering the command RESTART REBOOT. Alternatively, shut
down and restart the switch using its power switch (AC models) or
run/standby switch (DC models).
Table 11: 10/100BASE-T Port LEDs on the AT-8948.
LED State Function
L/A
(Link activity)
Green A 100 Mbps link is open.
Flashing green 100 Mbps activity is occurring.
Amber A 10 Mbps link is open.
Flashing amber 10 Mbps activity is occurring..
D/C
(Duplex/collision)
Green The port is operating in full duplex mode.
Amber The port is operating in half duplex mode.
Flashing amber Collisions are occurring.
Table 12: LEDs on the AT-PWR01 and AT-FAN01.
LED State Function
Fault Red There is a fan failure or the temperature has
exceeded the specified limit of 75º C (167
º F).
PWR Green A PSU is installed in the switch and is receiving
power. The FOM does not have this LED.