CHAPTER 6 SYSTEM OPERATIONS

To maintain the system in a normal state, maintenance technicians need to monitor the servicing status of the system. Figure 6-1shows the flow of the system status monitor.

When trouble occurs in any part of the system or to any phase of system operations, maintenance technicians are alerted by an alarm indication or by a report from a station user or an operator. When the system becomes overloaded, maintenance technicians can execute Line Load Control.

SYSTEM STATUS MONITOR

1. ALARM INDICATIONS

Alarm Lamps on Circuit Card

Alarm Lamps on TOPU

Alarm Lamps on Attendant Console

2. COLLECTION OF SYSTEM MESSAGES

3. INDICATION OF LOCKOUT STATUS

4. LINE LOAD CONTROL

Figure 6-1 System Status Monitor

1.ALARM INDICATIONS

When trouble occurs in the system, the system activates an appropriate remedial action (system changeover, make-busy shift of the circuit card, restart processing, etc.) by executing the automatic diagnostic function. Re- sults of the action taken and the faulty situation are displayed.

1.1Kinds of Alarm Indications

Figure 6-2shows the kinds of alarm indications.

TROUBLE

ALARM INDICATION

SYSTEM MESSAGE

TOPU

CIRCUIT CARDS ATTENDANT/DESK CONSOLE

MAT

SYSTEM DEDICATED PRINTER

Figure 6-2 Alarm Indications

 

NDA-24300

CHAPTER 6

 

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Issue 1

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NEC NDA-24300 manual Kinds of Alarm Indications