Exfo VDSL2 Manuel d'utilisateur télécharger pdf (Page 257)

Datos técnicos

Conjunto de pruebas de servicio triple cobre, VDSL2, ADSL2+ e IP 251

www.EXFO.com

NOTE a. At 23 °C ± 1 °C on batteries, unless otherwise specified.

b. Characteristics are subject to instrument noise floor (approx.

–70 dBm). Levels below –70 dBm can be measured using the PSD noise test.

c. Does not include the uncertainty due to VOP.

RECEIVER CHARACTERISTICS

Receive frequency 200 Hz to 10 kHz, resolution 1 Hz

Receive frequency 10 kHz to 20 kHz, resolution 10 Hz

Receive frequency 20 kHz to 30 MHz, resolution 1 kHz

Frequency uncertainty (accuracy) ±0.1 %

Receive level (dBm) –90 to +10 at 100 Ω or 135 Ω,resolution 0.1 dB

–100 to +10 at 600 Ω,resolution 0.1 dB

Level uncertainty (accuracy) ±1.0 dB for 200 Hz to 20 kHz at 0 dBm

±1.0 dB for 20 kHz to 30 MHz at 0 dBm

Impedance (Ω) 100, 135, 600 and bridging (100 kΩ)

TRANSMITTER CHARACTERISTICS

Transmit frequency 200 Hz to 20 kHz, resolution 1 Hz steps

Transmit frequency 20 kHz to 30 MHz, resolution 1 kHz steps

Transmit level (dBm) –10 to +10 at 100 Ω or 135 Ω

–20 to +10 at 600 Ω

Frequency uncertainty (accuracy) The better of ±50 ppm or ±0.5 Hz

Level uncertainty (accuracy) ±0.6 dB 200 Hz to 1 MHz

±1 dB 1 MHz to 2.2 MHz

±2 dB 2.2 MHz to 17 MHz

±3 dB 17 MHz to 30 MHz

Impedance (Ω) 100, 135 and 600

VF NOISE MEASUREMENT

Range (dBm) 0 to –90, subject to instrument noise floor

Uncertainty (accuracy) (dB) ±1

Filters None, 3 kHz flat, C-message, psophometric, notched and D filter (IEEE 743-1995)

Graphic results Delay distribution and jitter histogram

VF IMPULSE NOISE

Low threshold (dBm) 0 to –40, in 1 dB steps

Mid threshold Low threshold plus separation

High threshold Mid threshold plus separation

Separation (dB) 1 to 6, in 1 dB steps

Dead time (ms) 125

Filters None, 3 kHz flat, C-message, psophometric, notched and D filter (IEEE 743-1995)

Counter Maximum 999 for each threshold

Timer 1 minute to 24 hours, default is 15 minutes

POWER INFLUENCE (NOISE TO GROUND)

Noise range (dBm) –60 to +10

Uncertainty (accuracy) (dB) ±1.0

Level uncertainty (accuracy) (dB) ±1.0 at –60 dBm

VF LONGITUDINAL BALANCE

Frequency (Hz) 1004

Frequency uncertainty (accuracy) ±50 ppm

Level range (dB) 0 to 80

Level uncertainty (accuracy) (dB) ±1

TIME-DOMAIN REFLECTOMETRY (TDR)

Mode One shot, continuous (auto-repeat) with cursor and zoom

Distance range (m) 8 to 6000 (25 ft up to 20 000 ft)

Pulse width 15 ns to 20 µ s (auto-selected in auto TDR test)

Test signals Sine wave, compensated sine wave, half-sine wave and square wave

Amplitude 7.5 V p-p on cable, 9 V p-p open circuit

Velocity of propagation (VOP) 0.400 to 0.999 or 120 m/µs to 299 m/µ s

Distance uncertainty

(accuracy) (m) ±(1.4 m + 2 % x distance) or ±(4.5 ft + 2 % x distance)

Units Feet and meters

Horizontal scale (m) Automatic or 30 (100 ft), 300 (1000 ft), 600 (2000 ft), 1500 (5000 ft), 3000 (10 000 ft), 6000 (20 000 ft),

13 500 (45 000 ft) and 15 000 (50 000 ft)

FREQUENCY-DOMAIN REFLECTOMETRY (FDR)

Distance range (m) 1.5 to 5000 (5 ft to 18 000 ft)

Velocity of propagation (VOP) 0.400 to 0.999 or 120 m/µs to 299 m/µs

Distance uncertainty (accuracy) (m) ±(3, 3 to 1000) ±(15, 1000 to 1500) ±(30, 1500 to 5000)

Units Feet and meters

LOAD COIL DETECTION

Count Five

Plot (kHz) Up to 10

Distance range (m) Up to 8000 (up to 27 000 ft)

SINGLE-END FREQUENCY RESPONSE (ATTENUATION)

Distance range (m) 12 to 5000 (40 ft to 16 000 ft)

Frequency range 4.3 kHz to 30 MHz

Frequency uncertainty (accuracy) ±50 ppm

Level uncertainty (accuracy) (dB) 2 dB, 4 dB at 30 MHz

Resolution (dB) 0.1

Horizontal scale (MHz) ADSL2+ = 2.208, VDSL2-12 = 12, VDSL2-17 = 17.66, VDSL2-30 = 30

Vertical scale (dB) 0 to +100

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Exfo VDSL2 Manuel d'utilisateur Page 257

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