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5. APPENDIX
FOL429-P Hardware Manual
15
5
APPENDIX
5.1 Signal Propagation Delay measurements of the system
1.
Uni-directional Propagation Delay (System only)
Measurement Overview:
BUS
short 62,5/125µm
BUS
Propagation Delay = 1µs
2.
Uni-directional Propagation Delay ( Fibre)
Measurement Overview:
BUS
300m 62,5/125µm
BUS
Propagation Delay = 2,5µs
Results:
Basic propagation delay for uni-/bi- directional FOL429 System are
1µs/2µs.
The propagation delay of 300m Fibre optic cable is 1.5µs
Hence, the fibre specific transmission speed of light is approximately
C
F
= 2*10
8
m/s
Following formulas can be applied to calculate the propagation delay of a
given system:
td = 1µs + (L / CF)
Monitor System (uni-directional)
L = Length of fibre optic cable in one direction [m]
BC
BC
RT
RT
FOL429
FOL429
FOL429
Analogue
Oscilloscope
Channel 1
Analogue
Oscilloscope
Channel 1
Analogue
Oscilloscop
e
Channel 2
Analogue
Oscilloscope
Channel 2
FOL429