Unit installation

Chapter 1 Introduction Installation and Operation Manual
1-26 Functional Description FCD-E1
Table 1-3. Handling of Management Access Conflicts
Type of First Response to Second Access
Access
Telnet
Inband
Telnet
Out-of-Band
Supervision
Terminal
Telnet Inband
Message Ignored Message
Telnet
Out-of-Band
Message Ignored Ignored
Supervision
Terminal
Disconnects
the terminal
Not possible Ignored
Alarm Collection
The FCD-E1 system stores alarms detected during its operation in a buffer that can
hold up to 100 alarms. Status indicators located on the front panel of the
FCD-E1 enclosure and on the management subsystems indicate the presence of an
alarm condition. Separate indications are provided for major and minor alarms.
Alarm Relay
In addition, the FCD-E1 system has an alarm relay that enables the activation of
bay alarms, remote indication of alarms, etc. The alarm relay is energized when
the FCD-E1 system is powered and operating normally, and is de-energized when
FCD-E1 system power is off. In addition, the user can select the state of the relay
contacts (closed or open) for each individual alarm condition.
The alarm relay has a pair of change-over dry contacts: the normally-open (NO)
contacts close in case of alarm, and the normally-closed (NC) contacts open in
case of alarm. The alarm contacts are floating with respect to the signal and chassis
grounds of the FCD-E1.
The alarm contacts can be connected, by means of jumpers, in the place of the
DCD and CTS lines in the rear panel CONTROL DTE port. Therefore, the
CONTROL DTE port can still be used for connecting via modems to the FCD-E1,
provided it is not used for polled communication. The alarms that result in the
activation of the alarm relay are as follows:
• Loss of power (indicated by the NO contacts).
• Detection of a hardware failure, and any other failure, during the power-up
self-test.
• Detection of real-time clock battery failure during the power-up self-test.
• Detection of a disruption in the database during the power-up self-test.
• Duplicate system name detected in the managed network.
• Signal loss, excessive bit error rate, excessive rate of bipolar violations, loss of
local or remote frame or multiframe synchronization, and/or reception of AIS
on the main link or on the sublink.
• Management link down.
The relay returns automatically to the no-alarm state when none of the alarm
conditions listed above is present.