TECHNICAL
2. Node + 3 System
In a more modern node + 3 system (150 homes per node), the number of amplifiers per node will be lower (up to 20), and all would be line extenders or mini-bridgers.
of hours in a day, and days in a year, to arrive at the kilowatt hours of energy used annually. We will assume 80% power supply efficiency. That is to say that 20% of the electricity purchased is used for running status monitoring and charging batteries, and wasted in heating the power supply. The rest powers the nodes and amplifiers. Also included in this chart is the calculation for number of power supplies in the system and number of batteries, discussed below.
What power does each component consume? Individually, the consumption of the elements of the HFC network are fairly low.
How many components per system?
By dividing the total homes passed by the design target for number of homes per node, we can determine the approximate number of nodes in the system. We take this number and multiply the power total for a single node to obtain the total system power requirement. Now we can calculate the power across the system, and adjust for power supply efficiency and estimate the entire power usage. We can then take that number of kilowatts and multiply by the number
Power per Unit Assumption Item
Power (W)
Node
100 100
Trunk Amp/Bridger
Line Extender/Mini Bridger
40
100,000- home system Item
Quantity per Node
Count per System
Power per System (W)
Node + 6
Node + 3
Node + 6
Node + 3
Node + 6
Node + 3
Homes per Node
500 200
150 667
Nodes
20,000 160,000 240,000
66,667
Trunk Amps/Bridgers
8
0
1,600 6,000
-
-
MiniBridger/Line Extender
30
20
15,000
600,000
Power Supplies
2.5
1 6
500
667
Batteries (6 per supply)
15
3,000
4,000
Total Power (kW)
420
667
Total Power at
80%
Efficiency (kW)
525
833
Total Energy at 24 hours * 365 days (kWh)
4,599,000
7,300,000
MARCH 2025 Volume 47 No.1
97
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