Figure 48, Shows the location of – Nortel Networks BCM200/400 User Manual
Page 83
Chapter 3 Viewing the BCM system LEDs
83
BCM200/400 4.0 Installation and Maintenance Guide
Figure 48 DTM LEDs
describes the functions of the DTM LEDs.
Table 21 DTM LED functions
LED Status
Descriptions
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.
Transmit alarm
On
The DTM cannot transmit. The DTM sends an alarm indication signal (AIS) to
the terminating switch. This half-duplex link does not work.
Transmit error
On
The DTM is sending a remote alarm indication (RAI) carrier failure alarm
(CFA) to the terminating switch. If the transmit alarm is not on, this error
indicates a far-end or cable problem.
All LEDs
Flashing
The DTM is initializing.
Tip: You can install a maximum of three DTM modules in the BCM main unit, depending
on the available buses.
Power LED
Status LED
In service LED
Loopback test LED
Receive LEDs
Transmit LEDs