RPR Multicast Effi ciency by Technology RPR Point-to-Point
Bandwidth Consumed by Pay TV 350Mbps 3.5Gbps
Bandwidth Available after Multicasting 9.6Gbps 6.5Gbps
Bandwidth Advantage of RPR 3.15Gbps
TABLE 12.4 RPR and Multicast Bandwidth Savings
Resilient Packet Ring (RPR) 363
Formula A ??“ Point-to-Point Fiber Cost
Cost of Fiber from Hub#1 to Network ?— 2 = Fiber Cost A
Cost of Fiber from Hub#2 to Network ?— 2 = Fiber Cost B
Cost of Fiber from Hub#3 to Network ?— 2 = Fiber Cost C
Cost of Fiber from Hub#4 to Network ?— 2 = Fiber Cost D
Hub & Spoke Fiber Cost = Formula B ??“ Ring Fiber Cost
Cost of Fiber from Hub #1 to Hub #2 = Fiber Cost E
Cost of Fiber from Hub #2 to Hub #3 = Fiber Cost F
Cost of Fiber from Hub #3 to Hub #4 = Fiber Cost G
Cost of Fiber from Hub #4 to Hub #5 = Fiber Cost H
Cost of Fiber from Hub #5 to Hub #1 = Fiber Cost I
Using published average fiber cost per mile per month from the Wall Street Journal
May 12th, 2005 Section B page 10 of $400 we can calculate the relative cost of these
Figure 12.22 Star Topology
Transport device
Fiber
IP network
Internet
IP TV/VoD
VoIP
Figure 12.23 Hub and Spoke Topology
Fiber
IP network
Internet
IP TV/VoD
VoIP
PTS
PTS
PTS
PTS
PTS
364 Chapter 12
two approaches.
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