Network delay Slide 1 What are the boundaries of the Praesideo System bus ??

Network delay Slide 2 NC NON redundant system Fiber length System bus length = Fiber length ÷ 2

Network delay Slide 3 Redundant system NC Fiber length

Network delay Slide 4 Redundant system NC Fiber length System bus length = Fiber length ÷ 2

Network delay Slide 5 Some properties of the MOST network:  Delay in a node (30ºC): 120 nS  Delay in a node (60ºC): 175 nS  Delay in Plastic and Glass fiber: 5 nS/m (= km/sec)  Total delay in system bus: ~20.9 uS

Network delay Slide 6  Nr of nodes : (NCO + 1x amp)  Delay 4 nodes (30ºC): 4 x 120 nSec = 0.48 uS  Delay for fibers: 20.9 uS – 0.48 uS = uS  Max Fiber length: uS / 5nS/m = 4084 m  Max System bus length: 4084 m / 2 = 2042 m  Nr of nodes : (NCO + 1x amp)  Delay 4 nodes (60ºC) : 4 x 175 nSec = 0.7 uS  Delay for fibers: 20.9 uS – 0.7 uS = 20.2 uS  Max Fiber length: 20.2 uS / 5nS/m = 4040 m  Max System bus length: 4040 m / 2 = 2020 m Δ L = 22 mtr ( = 1.1%)

Network delay Slide 7  Nr of nodes : (NCO + 1x amp + 1x CST)  Delay 4 nodes (30ºC): 5 x 120 nSec = 0.6 uS  Delay for fibers: 20.9 uS – 0.6 uS = 20.3 uS  Max Fiber length: 20.3 uS / 5nS/m = 4060 m  Max System bus length: 4060 m / 2 = 2030 m  Nr of nodes : (NCO + 1x amp + 1x CST)  Delay 4 nodes (60ºC) : 5 x 175 nSec = uS  Delay for fibers: 20.9 uS – uS = uS  Max Fiber length: uS / 5nS/m = 4005 m  Max System bus length: 4005 m / 2 = 2003 m Δ L = 27 mtr ( = 1.3%)

Network delay Slide 8  Max nr of nodes : 63 (max. addresses possible)  Delay 63 nodes (60ºC): 63 x 175 nS = uS  Delay for fibers: 20.9 uS – uS = uS  Max Fiber length: uS / 5 nS/m = 1975 m  Max System bus length: 1975 m / 2 = 988 m  Max nr of nodes : 63 (max. addresses possible)  Delay 63 nodes (30ºC) : 63 x 120 nS = 7.56 uS  Delay for fibers: 20.9 uS – 7.56 uS = uS  Max Fiber length: uS / 5 nS/m = 2668 m  Max System bus length: 2668 m / 2 = 1334 m Δ L = 346 mtr !! ( = 26%)

Network delay Slide 9 Relation number of nodes and system bus length, in one ring System bus length (mtr) Number of nodes

Network delay Slide 10 Relation number of nodes and system bus length, in one ring System bus length (mtr) Number of nodes

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