114APPENDIX D: CABLING REQUIREMENTS

Table 27 Insertion Losses for Mating Unlike Fiber Types - Transmitting Fiber

Receiving

Numerical

 

 

 

 

 

 

Fiber Size

Aperture

50 µ m

50 µ m

62.5 µ m

85 µ m

100 µ m

 

 

 

 

 

 

 

 

 

 

0.20

0.22

0.275

0.26

0.29

 

50 µm

0.20

0.0

0.4

2.2

3.8

5.7

 

50 µm

0.22

0.0

0.0

1.6

3.2

4.9

 

62.5 µm

0.275

0.0

0.0

0.0

1.0

2.3

 

85 µm

0.26

0.0

0.0

0.1

0.0

0.8

 

100 µm

0.29

0.0

0.0

0.0

0.0

0.0

 

 

 

 

Table 28 Typical Losses for Typical Connectors, Cables, and Splices

 

 

 

 

 

 

 

 

 

Type of Insertion

 

Loss

 

 

 

 

 

 

 

 

 

 

 

 

SC connector

 

 

.6 dB

 

 

 

 

ST connector (ceramic)

 

.6 dB

 

 

 

 

ST connector (plastic)

 

1.0 dB

 

 

 

 

ST connector (stainless steel)

 

.7 dB

 

 

 

 

62.5/125 cable

 

 

1.0 to 3.0 dB maximum per km, depending

 

 

 

on cable quality (nominal 2.0 dB)

 

 

8/125 cable

 

 

.5 dB/km (AT&T Lightguide)

 

 

Bypass switch (currently not

 

2.5 dB maximum

 

 

 

available in single mode)

 

 

 

 

 

 

Fusion splice

 

 

1 to 3 dB depending on type used (use .3 dB)

 

 

 

 

 

 

 

 

Example

Suppose that a link consisting of one km of 62.5/125 fiber with a maximum attenuation rating of 1.75 dB/km is transmitting into one km of 50/125 fiber with a maximum attenuation rating of 3 dB/km. The fibers are joined using a fusion splice rated at 0.3 dB and the link contains one in-line ST connector rated at 0.6 dB.

The following calculation would arrive at the link loss attenuation value for this linked fiber:

62.5µ m

+ 50µ m

+ splice

+ ST con-

+ insertion

= Total link

cable loss

cable loss

loss

nector loss

loss*

attenuation

1 km(1.75

+1 km(3

+0.3 dB

+0.6 dB

+2.2 dB

=7.85 dB

dB/km)

dB/km)

 

 

 

 

* for mating unlike fiber types

Page 114
Image 114
3Com 7000 manual Example, Type of Insertion Loss

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