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Chapter 9 Technical specifications
Characteristics of the OTDR
User Manual 7SMART102 Rev002 107
- 0 to 5.99 dB in steps of 0.01 dB for event thresholds
- -11 to -99 dB in steps of 1 dB for the reflectance
- 0.01 to 5.99 dB in steps of 0.01 dB for attenuation
– Display of slope and attenuation for a segment of fiber.
– Display of the position of a fault and of attenuation.
– Display of the reflectance of the fault.
– Display of ORL
Manual
Measurement
– Measurement of slope between the cursors.
– Measurement of attenuation between two segments of fiber.
– Measurement of reflectance of a reflecting element.
– Measurement of ORL between the two cursors.
– Measurement of splice by 2 or 5 points method
Typical
specifications
Typical values, measured at 25°C unless specified.
E136FB (2 ports) E126A
Central Wavelength
a
1310 +/- 20nm
1550+/- 20nm
filtered 1625 nm +/- 20nm
1310 nm +/- 20nm
1550 nm +/- 20nm
Typical RMS Dynamic Range
b
40 / 40 / 41 dB
35 / 33 dB
Distance Range
c
Up to 150 km
Up to 100 km
Pulse width 3 ns to 20µs 5 ns to 20µs
Event Dead Zone
d
0.90 m 1.3 m
Attenuation Dead Zone
e
2.5 m 4 m
Splitter Attenuation Dead Zone 45 m after 15dB splitter loss N/A
a. Laser, at 25° C and measured at 10 µs
b. Typical value corresponding to the one-way difference (in dB) between the extrapolated backscattering level at the
beginning of the fiber and the RMS (SNR = 1) noise level, after 3 minutes averaging, using the largest pulse width.
c. At 1550 nm
d. EDZ measured at +/- 1.5 dB below the peak of a unsaturated reflective event using the shortest pulse width.
e. ADZ measured at +/- 0.5 dB from the linear regression, using a FC/UPC- type reflectance, at shortest pulse width.