LEDs and Switches
B-2
893-743-A
Table B-1 describes the functions of the LEDs and switches.
Table B-1. Model 281xSA hub LEDs
Type
Label
Color
Meaning
Power LED
Power
Green
DC power is accurately delivered to the internal
circuitry of the hub.
Concentrator
LEDs
Data
Green
Data is present in the hub.
<Data>
Green
Stretched LED lights for 34 ms after each data
transmission. This allows the eye to perceive
very short transmissions.
Col
Amber
Stretched LED lights for 140 ms indicating a
collision in the hub.
Isolate
Amber
Host portion of the Model 281xSA hub has been
partitioned (isolated) by SNMP network
management from the extended Model 281xSA
“backplane.” These 16 ports of the Model
281xSA hub continue to function as their own
16-port Ethernet segment.
AUI Port LED
(Model 2813SA
hub)
AUI
Partition
Amber
AUI port has been autopartitioned because of
an excessive number of consecutive collisions,
an excessively long single collision signal, or
jabber input; or it has been partitioned by SNMP
network management.
10BASE-FL
Port LEDs
(Model 2814SA
hub)
Partition
Amber
10BASE-FL port has been autopartitioned
because of an excessive number of
consecutive collisions, an excessively long
single collision signal, or jabber input; or it has
been partitioned by SNMP network
management.
Link
Green
Port is connected to another 10BASE-FL or
FOIRL port on a powered concentrator or
transceiver.
Expansion Port
LEDs
Expansion
Status
Int, 2, 3, 4,
5
Green
Specified expansion port connection to a Model
281xSA hub has been physically completed,
and the Model 281xSA hub microcontroller has
passed diagnostics. Expansion unit #1 (Int) is
the internal host portion of the Model 281xSA
hub, and units 2 through 5 are the external
Model 280x hub host units.