LED Summary
LED
1
Off
On
Flashing
Power
No power
Power OK
N/A
Module OK
Self-test failed
Self-test OK
N/A
or not operating
Speed
No power, or
Valid speed
N/A
(4/16 Mb/s) repeater needs
an upgrade.
(see Ring A/B
LEDs)
Ring In/
Inactive or
Connected to network
Continuous single flash: network
Ring Out
wire fault
management disabled port.
Continuous double flash: wrong speed.
Hub MAU ONLY:
Ring A/B
Not connected
Connected to Ring A
Continuous single flash: network
or Ring B
management disabled port.
A and B alternately flash: repeater needs
an upgrade or an upgrade is in progress.
1
Scroll:
During power-up self-tests, all LEDs, except for the Power LED, will indicate a scrolling
pattern.
Ring Speed Notes:
Even if you set the repeater’s Speed switch to the wrong speed, no data will be lost or corrupted. Traffic
loops back at the point where there is a speed mismatch, and the rest of the network remains
operational.
The repeater’s speed detection feature protects the network from devices that are set at the wrong net-
work speed. When using some non–Digital equipment, isolating faults and reconfiguring the network
may take up to 20 seconds.
The LEDs indicate status by being on, off, and flashing. Flashing LEDs indicate special situations.
There are two flashing patterns and a scroll pattern. When an LED indicates a continuous single-flash
pattern, network management has disabled the port. A continuous double-flash pattern indicates the
wrong speed. In a scroll pattern, the LEDs turn on and off in a set order.
10
DECrepeater 900TL
