NEC NEAX NDA-24349 - Manual (Page 69)

Chapter 3 System Highlights
NEAX2000 IPS Request For Proposal (RFP) Reference Guide Page 3-17
NDA-24349 Issue 4
Electrical Characteristics (Central Office Trunk)
Description Specifications
Insulation Resistance 15 mega-ohms or more at 100Vdc
DC Resistance On-hook conditions: 30 mega-ohms
Off-hook conditions: 1,700 ohms
Impedance On-hook conditions: 20 kilo-ohms (300 to 3,400Hz)
8 kilo-ohms (at 24Hz)
Looped conditions: 600 ohms
Leak Current 0 mA at on-hook conditions
Transmission Characteristics (For TDM Circuits)
Description Specifications
PCM Coding System A-law/U-law
Insertion Loss 0.15 dB at 1KHz
Return Loss 20 dB or more (300 to 3,400Hz) against 600 ohms
Longitudinal Balance 59 dB or more (300 to 3,400Hz)
Attenuation/Frequency Distortion -0.2 dB to +0.7 dB (300 to 3,400Hz)
Group Delay Distortion 0 to 0.3msec. (500 to 2,800 Hz)
Total Distortion 25 dB (Input signal:-45 dBm0)/40 dB(input signal:0 dBm0)
Idle Channel Noise -67 dBmop or less (psophometric noise)
-50 dBm0 or less (single frequency noise)
Impulsive Noise 0 counts at -35 dBm
Cross Talk Attenuation 90 dB or more
Inter-modulation Products -40 dB or more
Spurious In-Band Signals -49 dBm0 or less
Signal Attenuation Attenuation rate: 12 dB per octave or more at 3.4 kHz above
Attenuation level: -40 dBm or less at 3.4 kHz and above
-70 dBm or less at 50 kHz and above