Black Box TS255A Spécifications télécharger pdf (Page 33)

Attenuation

Chapter 3 Optical TAPs

rev. 1

 Transmit power from the network devices

 Cable distance from the network device to the TAP

 Maximum insertion loss from the TAP (see Table 5)

 Cable distance from the TAP to the analyzer

 Analyzer port receive sensitivity

 Other less crucial items that may also affect you include:

 Number or quality of any connectors or patch panels in

the path to and from the TAP

 Age of the fiber cables

 Amount of heat in the environment where the fiber runs

In each split ratio, what you are dividing is the light power from the

incoming network link. The larger percentage of the light power is

used for the connection to the other network device and the smaller

portion is the light power for the analyzer. As long as there is

sufficient light power, all data is still sent to the analyzer regardless of

the split ratio chosen.

Table 5 Maximum insertion losses

Maximum Insertion Losses in Decibels

Multimode

50 micrometer

Multimode

62.5 micrometer

Single-Mode

9 micrometer

Split Ratio

1. The ratio is network/analyzer. So, a 70/30 connection has 70% of the light

power for the network and 30% for the analyzer.

1300nm 850nm 1300nm 850nm 1310-1550

50/50

3.5/3.5 4.7/4.7 4.5/4.5 5.5/5.5 3.6/3.6

60/40

3.0/5.0 3.8/5.7 3.7/5.6 4.7/6.6 2.8/4.8

70/30

2.3/6.3 3.0/7.0 2.9/7.0 3.9/8.0 2.0/6.1

80/20

2. Not recommended because too little light power reaches the analyzer.

1.7/8.3 2.4/9.0 2.3/9.0 3.2/10.0 1.3/8.0

90/10

1.2/12.0 1.9/12.5 1.8/12.8 2.7/13.5 0.8/12

Fiber Loss/km

3. Fiber loss is per kilometer of fiber.

1 3130.4/0.3

Connector Loss

.5 .5 .5 .5 .2

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 63 64

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Black Box TS255A Spécifications Page 33

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