Installation Instructions

T echnical instructions for optic fibre installation testing
D N 00203719 © N okia Corporation 73 (79)
I ssue 2 D RAFT 1 - en N okia Proprietary and C o n f idential
Note
at least, called “launching fibres”) must be connected with bo
t
so that connector attenuation is included in the measurement
r
The measurement must be performed as follows:
1. Connect OTDR to one end of the fibre optic cable and perf
o
measurement.
2. Connect the OTDR to the other end of the fibre optic cable
measurement.
3. Average the two measurement results to obtain the real opt
i
The MTAV reference value is determined basing on the followin
g
Figure 37. M TAV formula
M TAV = [ (
a
x L) + (S
n
x S
a
) + (C
n
x C
a
) ] (dB)
Where ... Represents Value
α
Fibre optic specific attenuation, ref erred
to the reference w aveleng th (1550nm )
dB/Km
L L eng th of the fibre optic under
evaluation (UL+D L)
Km
S
n
N um ber of splices -
S
a
Reference splice attenuation provided
in
dB
C
n
N um ber of c onnectors-
C
a
Reference connector attenuation dB