FIBERROAD FR-5A3010P, Руководство пользователя, Страница: 8 / 11

User Manual
© 2022 Fiberroad Technology Co., Ltd All right reserved Page 8 of 11
Include room for future capacity. It’s convenient to have at least one spare port for
diagnostics, troubleshooting, or monitoring. And many clients want extra ports for the
option to add more PD devices in the future. However, as long as devices are
appropriately selected and integrated, accounting for spare ports isn’t required for a
PoE power budget calculation.
Step 2: Scale For The Operating Environment
When performing a PoE power budget calculation, it’s essential to account for
environmental conditions.
Accommodate for the conditions. Expect the long-term performance of a power
supply to be 70% of its rating in a benign/conditioned environment (somewhere with
steady temperatures between 32°F/0°C and 120°F/50°C). In a benign environment,
divide the total wattage from step one by 0.7.
If the power supply is subject to a harsh environment (cold temperatures less than
32°F/0°C or heat above 120°F/50°C), plan for diminished performance. Divide the total
wattage from step one by 0.6 for this type of setting.
In extreme conditions, industrial-grade modes, such as Fiberroad Industrial PoE Series,
DIN rail mountable, and DC 48V power supplies.
Take this harsh scenario, for instance:
A switch and its power supply will be stored in a metal enclosure, exposed to direct sun,
at a site in the northeastern United States. In winter, the temperature inside the
enclosure could be as low as – 10°F/ – 24°C. And in summer, it could be as high as
140°F/60°C. Accounting for the temperature inflexions, expect the power supply to
operate at 60% of its power rating.
It’s always safe to assume a conservative long-term performance drop of 50%, no
matter the conditions. That means totalling the anticipated power demand (step 1) and
dividing by 0.5 (step 2) to get a power budget in watts.
Step 3: Select The Power Source
After determining the demand for PoE power and accounting for the surroundings, it’s
time to select an appropriate supply. Fiberroad has DC 48-56V supplies with ratings
from 30 watts to 480 watts.
❖
Troubleshoot
⚫
Please follow this step if the equipment have trouble.
⚫
Make sure the equipment is installed according to the manufactures installation guide.
⚫
Confirm RJ45 cable order meets EIA/TIA568A or 568B standard.
⚫
Every PoE port can provide PoE equipment with a maximum power of less than 30W;
please do not connect the PoE equipment with control over 30W.
⚫
Replace the equipment that can not work with a proper functioning 8port PoE Ethernet
switch to check if the equipment is damaged.
⚫
Please get in touch with your vendor if trouble still exists.