IBA ibaPADU-8AI-L, Руководство пользователя

Страница: 32 / 33

Manual ibaPADU-8AI-U/-8AI-I
32 Issue 1.6
Equation for calculating the FO budget (A
Budget
):
𝐴𝐴
𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵
= |( 𝑃𝑃
𝑅𝑅𝐵𝐵𝑅𝑅𝐵𝐵𝑅𝑅𝑅𝑅𝐵𝐵𝑅𝑅
− 𝑃𝑃
𝑆𝑆𝐵𝐵𝑆𝑆𝐵𝐵𝐵𝐵𝑅𝑅
)|
P
Receiver
= sensitivity of FO receiving interface
P
Sender
= output power of FO transmitting interface
Equation for calculating the fiber optic cable length (l
Max
):
𝑙𝑙
𝑀𝑀𝑀𝑀𝑀𝑀
=
𝐴𝐴
𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵
− (2 ∙ 𝐴𝐴
𝐶𝐶𝐶𝐶𝑆𝑆𝑆𝑆𝐵𝐵𝑅𝑅𝐵𝐵𝐶𝐶𝑅𝑅
)
𝐴𝐴
𝐹𝐹𝑅𝑅𝐹𝐹𝐵𝐵𝑅𝑅𝐶𝐶𝐹𝐹𝐵𝐵𝑅𝑅𝑅𝑅
A
Connector
= connector loss
A
Fiberoptic
= cable attenuation
Calculation for the example ibaFOB-io-Dexp -> ibaBM-PN in the best case:
𝐴𝐴
𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵
= | �− 30 𝑑𝑑𝑑𝑑𝑑𝑑 −
(
− 9 𝑑𝑑𝑑𝑑𝑑𝑑
)
� | = 21 𝑑𝑑𝑑𝑑
𝑙𝑙
𝑀𝑀𝑀𝑀𝑀𝑀
=
21 𝑑𝑑𝑑𝑑 − (2 ∙ 0.5 𝑑𝑑𝑑𝑑 )
3.5
𝑑𝑑𝑑𝑑
𝑘𝑘𝑑𝑑
= 5.71km
Calculation for the example ibaFOB-io-Dexp -> ibaBM-PN in the worst case:
𝐴𝐴
𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵
= | − 30 𝑑𝑑𝑑𝑑𝑑𝑑 −
(
− 16 𝑑𝑑𝑑𝑑𝑑𝑑
)| = 14
𝑑𝑑𝑑𝑑
𝑙𝑙
𝑀𝑀𝑀𝑀𝑀𝑀
=
14 𝑑𝑑𝑑𝑑 − (2 ∙ 0.5 𝑑𝑑𝑑𝑑 )
3.5
𝑑𝑑𝑑𝑑
𝑘𝑘𝑑𝑑
= 3.71km
Note
When connecting several devices as daisy chain (e.g. ibaPADU-8x with 3Mbit) or as ring
(e.g. ibaPADU-S-CM with 32Mbit Flex), the maximum distance applies to the section
between two devices. The FO signals are re-amplified in each device.
Note
When using fiber optics of the 50/125 µm type, a distance reduction of approx. 30-40%
must be expected.