Fiber Optic Networks ch3.pptVIP

Fiber Optic Networks Ch 3 Fiber Optics Technician’s Manual, 3rd. Ed Jim Hayes Where Fiber is Used History First fiber optic network installed in Chicago in 1976 (Link Ch 3k) Now more than 90% of long-distance voice links use fiber optics CATV is sent over fiber optics using an analog transmission Soon it will convert to digital compressed video The Internet backbone is also fiber Where New Fiber is Going “The Last Mile” Fiber to the home Fiber to the Curb Fiber to the office Fiber to the telephone Fiber to the desktop See links Ch 3a, 3b, 3c Economics of Fiber Telephony A single strand of fiber can carry more traffic than thousands of copper pairs Fiber saves in materials costs, installation, splicing labor and reliability, and uses less space in the conduits Fiber is the clear choice for high traffic and long distance links FTTC and FTTH Fiber To The Curb and Fiber To The Home Not cost-efficient yet, but will become needed as customers demand more bandwidth SONET Synchronous Optical Network A standard to enable telecommunications networks to interoperate The international equivalent to SONET is SDH (Synchronous Digital Hierarchy) Now that data traffic surpasses voice traffic, SONET is threatened by IP (Internet Protocol) and VoIP (Voice over IP) Fiber To The Premises (FTTP) Telcos are deploying FTTP Verizon spent $1 billion in 2005 to deploy FTTP to 3 million homes and businesses in 16 states It plans to continue spending $1 to $2 billion per year on FTTP until 2010 ATT is spending $6 billion on FTTN (Fiber To The Neighborhood or Fiber To The Node) to be completed in 2008 (links Ch 3d, 3e) CATV (Cable television) CATV often converts from copper to fiber by overbuilding existing metal cable Attaching fiber to existing hanging cables, or Pulling fiber through existing underground ducts LANs (Local Area Networks) Most computer networks use UTP (Unshielded Twisted-Pair) copper cables UTP has a maximum length of 100 meters, and a maximum speed of 1 Gbps Fiber is not pop