GE MultiLink ML600, Инструкция по эксплуатации

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4–4 MULTILINK ML600 ETHERNET COMMUNICATIONS SWITCH – INSTRUCTION MANUAL
OPERATION CHAPTER 4: OPERATION
The data in Power budget values for various modules on page 4–4 has been collected to
provide guidance to network designers and installers.
The use of either multi-mode or single-mode fiber to operate at 100 Mbps speed over long
distances (i.e., in excess of 400 m) can be achieved only if the following are applied:
1. The 100 Mb fiber segment must operate in full-duplex (FDX) mode (i.e. the full-
duplex (factory default).
2. The worst-case OPB of the fiber link must be greater than the fiber cable's
passive attenuation, where attenuation is the sum of cable loss, LED aging
loss, insertion loss, and safety factor.
Table 4–1: Cable losses
Cable size Mode Cable loss
62.5 / 125 μ m multi-mode 2.8 dB/km
50 / 125 μ m multi-mode 2.8 dB/km
100 / 140 μ m multi-mode 3.3 dB/km
9 / 125
μ
m single-mode 0.5 dB/km
0.4 dB/km (LXSC25)
0.25 dB/km (LXSC40)
0.2 dB/km (LXSC70)
Table 4–2: Power budget values for various modules
Module Speed Mode fdx (hdx)
λ
Size P
T
P
R
OPB
worst
d
worst
OPB
typ
d
typical
B2, B3 100 Mb FX multi 2 (0.4) km 1300 nm 62.5/125 μ m
50/125 μ m
-20 dB-
23.5 dB
-31 dB
-31 dB
9.0 dB
5.5 dB
3.0 km
2.0 km
14 dB
12 dB
5 km
4 km
B4 100 Mb FX single 18+ (0.4) km 1300 nm 9/125 μ m -15 dB -31 dB 14 dB 28 km 17.5 dB 35 km