NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 6
Page 453
Issue 1
SYSTEM OPERATIONS
1.3 Alarm Indications on TOPU
The system has alarm lamps on the TOPU as shown in Figure 6-3. Ta b l e  6 - 1 lists the meaning of each
lamp.
Figure 6-3   Alarm Indications on TOPU
Table 6-1  Description of Alarm Indications on TOPU
LAMP COLOR FUNCTION CONTENTS
PWR ON Green Power ON Indication Lights when the power is turned ON to the LPM (EMA card 
mounted)
ALM MJ Red Alarm urgency level 
indicating lamps for each 
IMG/ISWThe kind of lamp indications...

CHAPTER 6 NDA-24307
Page 454
Issue 1
SYSTEM OPERATIONS
1.4 Variable Alarm Indication
This feature allows PBX users to make a flexible change of system message output grades which range 0
to 3 and alarm lamp grades which consist of MJ, MN, SUP and NONE. Thus, the PBX users can give a
proper alarm grade to each system message according to their requirements. When assigning no data, the
default alarm grades are automatically adopted.
COMMAND COMMAND FULL NAME
ALMGAssignment of Alarm Grade Data 

NDA-24307 CHAPTER 6
Page 455
Issue 1
SYSTEM OPERATIONS
2. COLLECTION OF SYSTEM MESSAGES
System messages are collected in the following ways:
Automatic printout to the system message dedicated printer
Automatic printout to the MAT printer
Printout by DFTD command
2.1 Automatic Printout to System Message Dedicated Printer
Figure 6-4 shows the operating procedure.
Figure 6-4   Automatic Printout to System Message Dedicated Printer Operating Procedure
2.2 Display on MAT
Set Scanning to Scanning ON...

CHAPTER 6 NDA-24307
Page 456
Issue 1
SYSTEM OPERATIONS
3. INDICATION OF LOCKOUT STATIONS
When a station is in lockout status (permanent signaling state, shorting across speech wires, etc.), it can quickly
be discovered, preventing the situation from developing into serious trouble.
3.1 Indicating Method
By entering the following commands from the MAT, information pertaining to the lockout station con-
cerned will display.
3.2 Recovery Procedure
Figure 6-5   Recovery Procedure From Lockout Station (1/2)...

NDA-24307 CHAPTER 6
Page 457
Issue 1
SYSTEM OPERATIONS
Figure 6-5  Recovery Procedure From Lockout Station (2/2)
COMMAND COMMAND FULL NAME
RLSTRelease Station/Trunk
A
RLST command
(Confirm: DT)
Hear DT?
Replace 16LC card
with a spare.The circuit may be faulty temporarily.
Observe situation for a while. Forcibly release the lockout station circuit.
Go off-hook again and confirm DT.
YES
NO 

CHAPTER 6 NDA-24307
Page 458
Issue 1
SYSTEM OPERATIONS
4. LINE LOAD CONTROL
In the PBX, Line Load Control can be activated automatically or manually as a countermeasure against
abnormal traffic congestion.
In the case of automatic control, the system automatically monitors an overloaded situation and restricts
outgoing calls from stations and incoming calls from trunks.
In the case of manual control, the operator at an Attendant/Desk Console or the MAT restricts outgoing calls
from stations and incoming...

NDA-24307 CHAPTER 6
Page 459
Issue 1
SYSTEM OPERATIONS
Cancelling
Figure 6-7   Line Load Control Operations on ATTCON—Cancelling
Figure 6-8   Line Control Indication (ATTCON)
 
Press LOOP key.
Press CANCEL key.Lamp (Figure 6-8) on control 
panel lights.
System message [6-D] displays. (SST)
Dial the access code for cancelling 
Line Load Control.
LAMPNEC 

CHAPTER 6 NDA-24307
Page 460
Issue 1
SYSTEM OPERATIONS
(2) Key Operations on the Desk Console (DESKCON)
By the operations on the Desk Console, restriction is applied on an outgoing call from a station having
SFC in which the SFI = 16 (Line Load Control) of ASFC command is set as RES=0 (incoming calls to
that station are allowed). For restricting incoming calls from a trunk, system data ASYD, SYS1,
INDEX59, b0=1 should be assigned.
Setting
Figure 6-9   Line Load Control Key Operations on DESKON—Setting...

NDA-24307 CHAPTER 6
Page 461
Issue 1
SYSTEM OPERATIONS
Figure 6-11   Line Load Control Indication (DESKCON)
(3) Operations on the MAT
By entering ALLC command from the MAT, Line Load Control executes. The station to be controlled and
the contents of the Line Load Control executed on the MAT are the same as those in Step (1), Key
operations on the Attendant Console (ATTCON).
(4) Automatic Setting
If the usage rate of the CPU exceeds the system data usage rate, Line Load Control is automatically set.
In...

CHAPTER 6 NDA-24307
Page 462
Issue 1
SYSTEM OPERATIONS
5. IOC LINE MONITOR
(1) Functional Outline
This function monitors the IOC port status. As a result of the monitoring by this function, the following
is executed:
When the connection with a port has been disconnected, it is reported by a message.
When the connection with a port is set up, it is reported by a message.
The port status is stored in the memory and updated continuously.
(2) Message Judgment Criteria
Message Judgement Criteria are as...