Technical Information
4–7
Table 4–2 (Cont): LED Indicators
LED
Symbol
Color Normal Description
NI or NI(3) Module:
NI BAD
Red
Off
On
--
Self-test failed
Off
-- Self-test passed
Blink
-- Incompatible firmware
loaded
ACTn
n
Yellow
On/Off
On
--
NI port(n) carrier present
(n= 2, 3, or 4)
Off
--
NI port(n) carrier not present
FWDn
Green
On
On
--
NI port(n) in forwarding state
Blink
--
NI port(n) in broken state
Off
-- NI port(n) not forwarding, not
broken (in pre-forwarding or
backup state)
AUI SELECT
AUI
Green
On/Off
On
--
NI port AUI interface selected
(Series 500
Off
-- NI port ThinWire interface
only)
selected
EXT PWR OK
Green
On
On
-- AUI transceiver power OK
(In Series 500, not affected
by AUI/ThinWire switch)
Off
--
AUI transceiver power failure
FI Module: (Note: FI Null Module has only the FI BAD indicator)
FI BAD
Red
Off
On
--
Self-test failed
Off
--
Self-test passed
Blink
--
Incompatible firmware loaded
ACT1
1
Yellow
On/Off
On
-- Valid traffic present
Off
--
Not transmitting/receiving
valid packets
FWD1
Green
On
On
-- FDDI port in forwarding state
Blink
-- FDDI port in broken state
Off
-- FDDI port not forwarding, not
broken (in pre-forwarding or
backup state)
