Honeywell TC-RPA002, Руководство по внедрению

Страница: 17 / 44

ControlNet Fiber Media
Fiber Optic Coupling Scheme
R210 Experion PKS ControlNet Fiber Optic Implemenation Guide 7
10/04 Honeywell
About the optical power budget
The maximum allowable attenuation for a system using a medium distance Fiber Module
is 9.3 dB. The connectors, splices, and fiber cable all contribute to the attenuation of a
system. You can use the following formula to determine the length of cable you can use.
Maximum cable length (km) = (Rx - Tx) (total attenuation of connectors, splices, etc.)
cable attenuation (dB/km @ 1300nm)
For example, a fiber optic trunk segment could have the following attenuation
characteristics:
•
A cable with an attenuation of 1 dB/km @ 1300 nm.
•
Two cable connectors with an attenuation of 0.5 dB each.
•
A splice with an attenuation of 0.3 dB.
•
Repeater/Fiber hubs with maximum attenuation of 9.3 dB
Maximum cable length = (9.3 dB) (2 0.5 dB + 0.3 dB)
1 dB/km
For this example, the maximum cable length is 8 km.
Installation declaration
ATTENTION
This equipment shall be installed in accordance with the requirements of the
National Electrical Code (NEC), ANSI/NFPA 70, or the Canadian Electrical
Code (CEC), C22.1. It is supplied as “open equipment” that is intended to be
mounted on a sub-panel within an enclosure. The suitability of the enclosure
and installed system shall be acceptable to the local “authority having
jurisdiction,” as defined in the NEC, or “authorized person” as defined in the
CEC.