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LED indicators reference
Nortel Business Communications Manager 450 1.0
Installation — System
NN40160-301 01.04 Standard
July 2009
Copyright © 2006-2009 Nortel Networks
Figure 24 DTM LEDs
For information about the possible DTM LED states, see
Table 10 DTM LEDs (1 of 2)
Power
Status
Description
Power
–
for details.
Status
–
for details.
In service
Flashing
The T1, ETSI, or PRI trunks are out of
service because a loopback test is
running or the DTM is initializing.
Loopback test
On
A continuity loopback test is running.
Receive alarm
On
A problem with the received digital
transmission. This half-duplex link
does not work.
Receive error
On
A small error as a result of degraded
digital transmission. Possible causes
are an ohmic connection, water
ingress, or too long a loop.
Power LED
Status LED
In service LED
Loopback test LED
Receive LEDs
Transmit LEDs
Содержание BayStack 450 Switch
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