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8. Fiber Optic Reference

8.1 Establishing the Reference

Different methods can be used when making a reference measurement with

OMNIFiber. The reference measurement to use depends on how the standard

defines the link, and how the end equipment is interconnected. There are three

basic link definitions and three corresponding reference methods.

Link Reference Multimode Single-mode Where

Definition Method Standard Standard Used

link=2 cross 1 jumper method TIA-526-14A TIA-526-7 TIA-568A,

connects + or equivalent Method B Method A ISO 11801

cable plant 100BASE-X,

ATM, Fibre

Channel,

FDDI,

Token Ring

link=1 cross 2 jumper method TIA-526-14A TIA-526-7 10BASE-X,

connect + or equivalent Method A Method A.2 TIA 455-171

cable plant Method B

link=cable 3 jumper method TIA-526-14A TIA-526-7

plant or equivalent Method C Method A.3

8.2 The Launch/Jumper Cable

The launch/jumper cables are 2 m fiber cables and need to be of good quality and

in excellent condition. Always clean the launch cable before use.

NOTE

The launch cable used to set the reference value should be the same

type of fiber as the cables to be tested and certified, 50/125, 62.5/125 or

singlemode.

CHAPTER 8: OMNIFiber Reference

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Microtest OMNIScanner LT Especificaciones Pagina 117