ABB RELION RET670, Commissioning Manual, Page: 93 / 328

14
12
10
8
6
4
2
0
0
0.5 1.0
1.5
2.0
2.5
3.0 3.5 4.0
62.5/125 µm
50/125 µm
O
P
B
–
O
P
T
IC
A
L
P
O
W
E
R
B
U
D
G
E
T
-
d
B
FIBER OPTIC CABLE LENGTH - km
IEC11000409_1_en.vsd
IEC11000409 V1 EN
Figure 18: Optical power budget for fiber optic cable lengths
As shown in the graph, if one uses a 62.5/125 µm fiber, the value under the 62.5/125 µm
curve represents the remaining optical budget at any link length, which is available for
overcoming non-fiber cable related losses.
Losses in the connectors and splices are typically 0.3dB/connection. The user must
reserve 3dB spare for the uncertainty of the measurements.
1MRK 504 165-UUS -
Section 9
Establishing connection and verifying the IEEE C37.118/1344 communication
Transformer protection RET670 2.2 ANSI 87
Commissioning manual