Digital Channels Status - Grandstream Networks UCM6510 User Manual

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DIGITAL C HANNELS S TATUS
This section displays the status of the digital trunks on the UCM6510.
Firmware Version 1.0.2.5
RED alarm: there is physical wiring problem, loss
of connectivity, or a framing/line-­coding
mismatch with the remote switch.
YELLOW alarm: connected but the link is
working only one-­way. This means that the
remote switch is not able to maintain sync with
you, or is not receiving your transmission.
The following example scenarios could trigger
YELLOW alarm:
1. The T1 port is connected with J1 connection.
2. Incorrect cable is used.
3. When using E1, one end is using CRC4
while the other end is not.
BLUE alarm: the port goes into BLUE alarm
when it receives all unframed 1s on all timeslots
from the remote switch. This is a special signal to
indicate that the remote switch is having problem
with its upstream connection.
Cannot start up
UCM6510 IP PBX User Manual Page 279 of 317