NEC Neax 2000 Ivs2 General Description Manual

NEAX2000 IVS2 General Description
NDA-24293, Issue 2
Page 77
Chapter 7 Maintenance
Trouble Reporting and Diagnosis
The urgency of a fault is indicated by the MJ/MN lamp provided on the Power Card
and optional external alarm indicator. Details of the alarm indications are shown in
Table 7-1.
Faulty plug-in cards are quickly replaced with a spare providing minimum disruption
of service and no loss of system memory.
Table 7-1    Fault Detection Items
ITEM DESCRIPTIONALARM INDICATION POWER 
CARD/EXTERNAL...

NEAX2000 IVS2 General Description
Page 78NDA-24293, Issue 2
System Administration Chapter 7  Maintenance
System Administration
System data, which varies from installation to installation and which is subject to
continual change during service, is readily entered or changed from the Dterm or MAT
(Maintenance Administration Terminal).
The system data can be downloaded to, or uploaded from, a floppy disk in the MAT
computer.
Remote Maintenance
Access to the NEAX2000 IVS2, for the purpose of system...

NEAX2000 IVS2 General Description
NDA-24293, Issue 2
Page 79
Chapter 8 System Performance
Operating Conditions
Ambient Temperature:  32°F ~ 104°F (0°C ~ 40°C) 
Relative Humidity: 90% max (non-condensing)
Transmission Characteristics
a.) Cross Talk Attenuation: More than 70 dB at 1000 Hz
b.) Idle Circuit Noise: Less than -65 dBm
c.) Insertion Loss (relative to 1KHz-10 dBm):
 Station-to-Station - Typical 6 dB
 Station-to-Trunk - Typical 0.5 dB
 Trunk-to-Trunk  - Typical 0.5 dB at 0 dB PAD control
d.)...

NEAX2000 IVS2 General Description
Page 80NDA-24293, Issue 2
Rotary Dial Pulse and DTMF Signaling Chapter 8  System Performance
Rotary Dial Pulse and DTMF Signaling
1. Receiving Conditions:
Dial Speed:  9 ~ 11 pps
Break Ratio:  55 ~ 77% (10 pps)
Minimum Interdigital 
Pause: 192 ms
Switch Hook Flash:
Detection: 310 ~ 1610 ms 
2. Sending Conditions
Dial Speed: 10 pps (±0.8 pps)
Break Ratio:  67 ± 3%
Minimum Interdigital
Pause: 800 ms
3. DTMF Signaling
Frequency Combinations 
1. Receiving Conditions...

Chapter 8  System Performance Audible Tones and Ringing Signal
NEAX2000 IVS2 General Description
NDA-24293, Issue 2
Page 81
Audible Tones and Ringing Signal
Audible Tones
Ringing Signal
Frequency: 20 Hz (Nominal)
Signal Voltage:  75 Vrms (Nominal)
Interruption:
 2 sec. ON, 
4 sec. OFF (for external call)
 1 sec. ON and 
2 sec. OFF (for internal call)
Built-In Modem on MP Card
MODEM: 33.6 kbps 
Table 8-1    Specifications of Audible Tone
TONE FREQUENCY INTERRUPTION
Dial Tone (DT) 350 Hz mixed with 440...

NEAX2000 IVS2 General Description
Page 82NDA-24293, Issue 2
BHCA (Busy Hour Call Attempts) Chapter 8  System Performance
BHCA (Busy Hour Call Attempts)
The BHCA of the NEAX2000 IVS2 is shown below.
MAIN PROCESSOR WITHOUT FP
(1 PIM)ONE FP
(1~2 PIM)TWO FP
(3~4 PIM)THREE FP
(5~6 PIM)FOUR FP
(7~8 PIM)
Business or 
Hotel/Motel without 
ACD/OAI2000 2500 5000 7000 8000
Business or 
Hotel/Motel with 
ACD/OAI1000 2000 4000 5000 5500