NEC Neax 2000 Ivs2 General Description Manual
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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 ALARM INDICATOR (OPTION)REMARKS MJ MN 1 Reset Initial Available Available Indication of MJ or MN alarms is software-controlled on a per fault basis. 2Data Transmission Error between MP and FP/APAvailable Available 3 FP/AP Card Down Available Available 4 Digital Interface Fault Available Available 5 BUS Card Fault Available Available 6D term Line Fault Available Available 7 Station Line Fault Available Available 8 D-channel Circuit Down Available Available 9 Common Channel Down Available Available 10Number of lockout station exceeds a predetermined valueNot Available Available 11 SMDR Memory overflow Available Available 12 AC Power Down Available Available 13 DC Output Down Available Available 14 Fuse Blown Available Available
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 diagnosis, status reporting, and database reconfiguration, can be performed from remote locations (e.g., Maintenance Centers, Technical Assistance Service Centers, etc.). By taking advantage of the built-in modem on the NEAX2000 IVS 2 CPU, the following maintenance administration functions can be accomplished by a remotely located MAT via a modem over a central office network or a tie line network. System Data Correction/Upload/Download MP/FP Software Upgrade Control of Battery Disconnection Display of Line/Trunk Connections Detection of open or short circuit in the line cables for both analog and D term tele- phones Fault Message Display
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.) Longitudinal Balance Trunk Side: Better than 58 dB e.) PCM Characteristics: Line Rate - 1.544 Mbps µ-Law Meets North America TI-04 Standards f.) Return Loss: More than 15 dB (300 ~ 3,400 Hz) Line Impedance: Station: 600 Ω Trunk: 600 or 900 Ω g.) Leakage Resistance: More than 20,000 Ω
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 (Measured at Receiver Input) Signal Duration: More than 40 ms Interdigital Pause: More than 40 ms Signal Level: 0 ~ -25 dBm 2. Sending Conditions Signal Duration: More than 64 ms Inter-digital Pause: More than 64 ms Signal Level: Low Frequency: -10 dBm High Frequency: -9 dBm HIGH/LOW 1209 HZ1336 HZ1477 HZ 697 Hz 1 2 3 770 Hz 4 5 6 852 Hz 7 8 9 941 Hz * 0 #
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 Hz Continuous Special Dial Tone (SDT) 350 Hz mixed with 440 Hz 0.125 sec. ON, 0.125 sec. OFF Busy Tone (BT) 480 Hz mixed with 620 Hz 0.5 sec. ON, 0.5 sec. OFF Reorder Tone (ROT) 480 Hz mixed with 620 Hz 2.5 sec. ON, 0.25 sec. OFF Howler Tone (HWT) 2,400 Hz interrupted by 16 Hz Continuous Service Set Tone (SST) 350 Hz mixed with 440 Hz Continuous Ring Back Tone (RBT) 440 Hz mixed with 480 Hz 1 sec. ON, 3 sec. OFF Hold Tone (HDT) 480 Hz mixed with 620 Hz0.25 sec. ON, 0.25 sec. OFF 0.25 sec. ON, 1.25 sec. OFF Second Dial Tone 440 Hz mixed with 480 Hz0.25 sec. ON, 0.25 sec. OFF 0.25 sec. ON, 1.25 sec. OFF Call Waiting Ring Back Tone 440 Hz mixed with 480 Hz 1 sec. ON, 1 sec. OFF
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