Siemens 7XV5461-0B 00 Series Directions For Use Manual page 61

7XV5461-0Bx00
Reach 8 km:
– Path attenuation
– Optical wave length
Transmitting power coupled in multimode fibre
Receiver sensitivity
Optical Power Budget
Transmission distances
The possible transmission range with multimode fibres is essentially limited by two factors:
1st Limit of the bandwidth caused by modal distortion.
A multimode gradient fibre is used whose product bandwidth times length is greater than
200 MHz × km (typical value for a 62.5/125 µm fibre is 400 to 800 MHz × km, for a
50/125 µm fibre 400 to 1200 MHz × km). The theoretical limit of transmission range by
the product bandwidth times length results, considering the method used in the
FO-Repeater, in a maximum distance of 10 km.
2nd Fibre attenuation.
The typical attenuation of a 62.5/125 µm gradient fibre using light with λ = 1310 nm is
< 2 dB/km. For reasons of reserve and fibre-splice, and additional margin of 0.5 dB is
adequate. This results in practical calculation with 2.5 dB/km.
Note: This device model may not be used for transmission links < 4 km. For a trans-
mission link < 4 km, device model 7XV5461-0BF00 (reach max. 4 km) must be
used exclusively.
C53000-B1174-C173-5
With multimode fibre, the light of the
wave length λ = 1310 nm is anticipated with
an optical signal attenuation of 2.5 dB/km.
λ = 1310 nm
min.
-5.0 dBm
avg
-34 dBm
avg
29 dB
English
max.
0 dBm
avg
-34.5 dBm
avg
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