Examines the many false doctrines flooding into the Church by leading prophecy ‘experts’ who are mingling apocryphal books, pagan mythology, UFO lore, occult writings, human speculation & imaginati...
data time 2Full description
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Rise Time Budget
Rise Time Tota Totall rise rise tim time dep depen ends ds on: on: ± Tran Transm smitt itter er rise rise tim timee (t ( t tx) ± Mater Material ial Disper Dispersio sion n ¨t = M. M. ¨.L ¨.L (t (t mat ) ± Modal Modal dispe dispersi rsion on rise rise time time (t (t mod )
Receiver ver ri rise time (t (t rx)
t
sy s
« ! ¬ -
n
§ i ! 1
t
2 i
» ¼ ½
1 / 2
Rise Time« t rx Brx
!
350 /Brx ns; where
is receiver bandwidth in MHz
Similarly
t tx ! 350 / Btx ns
Rise Time« Modal Dispersion
Material
Rise Time
Dispersion Rise Time ¨t (or tmat ) = M. ¨ .L .L
tsys = [t2tx + t2rx + M2. ¨ 2.L2 + tmod]1/2 Bit rate For NRZ Coding Bmax = 0.7/tsys For RZ Coding
Bmax = 0.35/tsys
Example
The LED in a silica optical fiber link has a rise time time of 8nS 8n S and a spectral width of 40nm at an operating wavelength of 840nm. 8 40nm. The PIN photodetector has a rise time of 10nS. For silica M = 95.2 ps/(nm.km). For a 2.5Km link, the intermodal dispersion of graded index fiber is 3.5nS/Km. Calculate the system rise time and data rate that the system can support for NRZ coding and RZ coding.
Rise time of source Rise time of Detector
= =
8nS 10nS
¨tmat = 95.2 X 40 X 2.5
=
9.52nS
¨tmod = 3.5 X 2.5
=
8.75nS
Material dispersion
System
rise time t
1/ 2
« 2» !sys ¬ § t ¼ i - i !1 ½ n
tsys = [82 + 102 + 9.522 + 8.752]1/2nS = 18.2nS
Bit rate For NRZ Coding Bmax = 0.7/tsys Bmax = 0.7/18.2nS = 38.46Mb/s
