4. Maintenance
3160-A2-GB21-90 February 2001 4-11
Alarms
The DSU/CSU can be attached, either locally or remotely, to an ASCII terminal or
printer to display or print alarm messages. Alarms can a lso be displayed on a PC
that is using a terminal emulation package.
For standalone DSU/CSUs, you can route these alarms to the MODEM port, the
COM port, or both. For carrier-mounted DSU/CSUs, you can route them to the
COM port or dial them out using an external device.
Each alarm message contains a customer identification to ind icate which remote
DSU/CSU is reporting an alarm. For information about customer iden tification,
refer to

Displaying Unit Identity

in Chapter 3,
Operation
.
Possible alarm messages are as follows:
Continuous Loss Of Signal detected at the
x
Interface
(where
x
is either Network or DTE).
Alarm Cleared. Loss Of Signal condition at the
x
Interface
(where
x
is either Network or DTE).
Continuous Out Of Frame condition detected at the
x
Interface (where
x
is either Network or DTE).
Alarm Cleared. Out Of Frame condition at the
x
Interface
(where
x
is either Network or DTE).
Alarm Indication Signal received at the
x
Interface
(where
x
is either Network or DTE).
Alarm Cleared. Alarm Indication Signal at the
x
Interface
(where
x
is either Network or DTE).
An Excessive Error Rate has been detected at the Network
Interface.
Alarm Cleared. An Excessive Error Rate at the Network
Interface.
Yellow Alarm signal received at the
x
Interface
(where
x
is either Network or DTE).
Alarm Cleared. Yellow Alarm signal at the
x
Interface
(where
x
is either Network or DTE).
Continuous Out Of Frame condition detected at synchronous
data port
n
(where
n
is the port number).
Alarm Cleared. Out Of Frame condition at synchronous data
port
n
(where
n
is the port number).
An Excessive Error Rate has been detected at synchronous
data port
n
(where
n
is the port number).
Alarm Cleared. An Excessive Error Rate at synchronous data
port
n
(where
n
is the port number).