ENERGY STAR Program Requirements
For Small Network Equipment
Sample Calculations

Example Calculations of PAVG_MAX in Eligibility Criteria
Note: W = watts in the all examples below.
Product 1: Integrated Access Device (IAD) with a DOCSIS 3.0 Cable WAN connection and the following
LAN connections:
1. Four Gigabit Ethernet ports
2. Dual-band simultaneous wireless access point using three receive streams of 5GHz 802.11ac
and two receive streams of 2.4GHz 802.11n
Base Cable IAD allowance (PBASE)
Four Gigabit Ethernet ports
Base Wi-Fi capability
3 receive streams of 5Ghz 802.11ac2 receive streams of 2.4GHz 802.11n

6.1W
1.2W (4 x 0.3W)
0.7W
3.9W (3 x 1.3W)
0.4W (2 x 0.2W)

Total (PAVG_MAX)

12.3W

Product 2: Eight port Gigabit Ethernet Switch with Energy Efficient Ethernet (EEE) capability on all ports:
Base Switch allowance (PBASE)
Eight EEE capable Gigabit Ethernet ports

0.6W
4.0W [8 x (0.3W+0.2W)]

Total (PAVG_MAX)

4.6W

Product 3: IAD with a VDSL WAN connection and the following LAN connections:
1. Four EEE capable Gigabit Ethernet ports
2. Dual-band simultaneous wireless access point using three receive streams of 5Ghz 802.11n andtwo receive streams of 2.4Ghz 802.11n
Base VDSL IAD allowance (PBASE)
Four EEE capable Gigabit Ethernet Ports
Five receive streams of 802.11n

7.5W
2.0W [4 x (0.3W+0.2W)]
1.0W (5 x 0.2W)

Total (PAVG_MAX)

10.5W

ENERGY STAR Program Requirements for Computer Servers – Sample Calculations

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Additional Explanation and Examples of Section 7.1.A of the Test Method
Supporting Material:
Equation 1

DataRate = Z × 10Y (in bits per second)Where:• Z is 1, 2, or 5, and• Y is an integer. Adjust as required to achieve the desired datarate

Table 1: Test Rate Selection
DirectionRate (Mb/s)

Downlink orSymmetric link

1.0

2.0

5.0

102050100

200500Uplink

0.5

1.0

2.0

5.0

102050100200Explanation of Equation 1: Equation 1 is a limiting equation for ensuring the data rate chosen is lessthan the maximum data rate throughput the UUT can support while also being a similar data rate to othersimilar UUTs which may have slightly different maximum throughputs. Had EPA chosen a straightpercentage, that would have resulted in rewarding the lower performing UUT when comparing similar, but
not identical devices. For example:
If EPA required testing at 50% of the maximum throughput supported, a 50 Mbps router would
have been tested at 25 Mbps while a similar 40 Mbps router would have been tested at 20 Mbps,
which would give the 40 Mbps router a distinct advantage in testing if the products are samegeneral class of device as seen by the consumer.
Using standard values also avoids having to determine maximum throughput with precision. Table 8 isprovided as a convenience to show common values that result from Equation 1.
Example Calculations:
Example 1: Ethernet switch with theoretical maximum downlink throughput of 100 Mbps (which in thisexample achieves 95 Mbps in a lab setting). The tester can either:
1. Chose the next lowest downlink rate from Table 8 which is 50 Mbps, or;
2. Use Equation 1 to calculate the highest date rate possible that does not exceed 95 Mbps asfollows:
7

Data rate = 5*10 where z = 5 and y = 7
Example 2: Router with a tested maximum downlink throughput of 1.4 Gbps. The tester should:
1. Use Equation 1 to calculate the highest data rate possible that does not exceed 1.4Gbps asfollows:
9Data rate = 1*10 where z = 1 and Y = 9

ENERGY STAR Program Requirements for Small Network Equipment – Sample Calculations

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