1、 ATIS-0600015.13.2017 American National Standard for Telecommunications Energy Efficiency for Telecommunication Equipment: Methodology for Measurement and Reporting of 802.11xx Wi-Fi Access Points Alliance for Telecommunications Industry Solutions Approved January 2017 Abstract This document specifi
2、es the definition of Wi-Fi Access Points based on a network they served, as well as a methodology to calculate the Telecommunication Energy Efficiency Ratio (TEER). The standard will also provide requirements for how equipment vendors shall respond to a TEER request based on a specific application d
3、escription by making use of relevant data from internal and independent test reports. ATIS-0600015.13.2017 ii Foreword The information contained in this Foreword is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirements for an ANS. As such,
4、 this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the Standard. The Alliance for Telecommunication Industry Solutions (ATIS) serves the public through improved understand
5、ing between providers, customers, and manufacturers. The Sustainability in Telecom: Energy and Protection (STEP) Committee formerly the Network Interface, Power, and Protection (NIPP) Committee engages industry expertise to develop standards and technical reports for telecommunications equipment and
6、 environments in the areas of energy efficiency, environmental impacts, power, and protection. The work products of STEP enable vendors, operators, and their customers to deploy and operate reliable, environmentally sustainable, energy efficient communications technologies. STEP is committed to proa
7、ctive engagement with national, regional, and international standards development organizations and forums that share its scope of work. ANSI guidelines specify two categories of requirements: mandatory and recommendation. The mandatory requirements are designated by the word shall and recommendatio
8、ns by the word should. Where both a mandatory requirement and a recommendation are specified for the same criterion, the recommendation represents a goal currently identifiable as having distinct compatibility or performance advantages. Suggestions for improvement of this document are welcomed. They
9、 should be sent to the Alliance for Telecommunications Industry Solutions, STEP, 1200 G Street NW, Suite 500, Washington, DC 20005. At the time it approved this document, STEP, which was responsible for its development, had the following roster: K. Biholar STEP Chair (Nokia) J. Krahner, STEP Vice Ch
10、air (Cisco) L. Rabinovich, STEP TEE Chair (Cisco) S. Martin, STEP TEE Vice Chair (AT see Informative References A.1. The same as physical layer bit rate. Line Data Rate: The maximum user data rate AP is capable of passing from wired port to wireless user. Active mode: All ports (frequencies) connect
11、ed to N clients, with user data traffic. AP Utilization in %: Aggregated data traffic for all radio transmitters equally distributed between N clients divided by Line Rate and multiplied by 100%. Idle mode: The same as Active mode, but with no user data traffic (it is not zero traffic as service and
12、 protocol supporting traffic is present). Not been used, but ready. Typical utilization: 10% of Line Rate. Client: A device that connects to a Wi-Fi AP. Multiple Input, Multiple Output (MIMO): A physical layer configuration in which both transmitter and receiver use multiple antennas. Multi-User MIM
13、O (MU-MIMO): A technique by which an AP transmits a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PDU) to multiple receiving non-AP stations (STAs). QAM: Quadrature Amplitude Modulation Spatial Multiplexing (SM): A transmission technique in which data streams are transmitted on mul
14、tiple spatial channels that are provided through the use of multiple antennas at the transmitter and the receiver. Spatial Stream: One of several streams of bits or modulation symbols that might be transmitted over multiple spatial dimensions that are created by the use of multiple antennas at both
15、ends of a communications link. 3.2 Acronyms for 802.3at devices, Rs is 12.5 ohms. Test Procedure: 1. Connect PD under test to test equipment as shown in Figure B.1. 2. Rs shall be 0-Ohm. 3. Measure the average power per IEEE 802.3af/at for 15 minutes with readings at least every second. Figure B.1 r
16、epresents use of generic measurement equipment. The usage of specialized POE power measurement meters is permitted as well. ATIS-0600015.13.2017 10 Annex C (Informative) Annex C: IMIX Traffic The reference used for understanding the distribution of packet lengths on the real Internet comes from data
17、 collected by the Measurement & Operations Analysis Team of the National Library for Applied Network Research (NLANR) project during February 2001 under the National Science Foundation Cooperative Agreement No. ANI-9807479, and the National Laboratory for Applied Network Research. (The raw data can
18、be found on the NLANR website at .) Briefly summarized, a total of 342 million packets were sampled and recorded at the Merit Network monitor site during this period. The average packet size was 402.7 bytes, with the following packet sizes and types occurring most frequently: 40 bytes: Transmission
19、Control Protocol (TCP) packets with header flags but no payload (20 bytes of IP header and 20 bytes of TCP header), typically sent at the start of a new TCP session. Approximately 35% of Internet packets measured during this period were exactly 40 bytes long. Because these packets are small, they re
20、present only 3.5% of the traffic. 576 bytes: TCP packets from old implementations that use this Maximum Segment Size (MSS). These packets account for about 11.5% of the packets and 16.5% of Internet traffic. 1500 bytes: Packets corresponding to the Maximum Transmission Unit (MTU) size of an Ethernet
21、 connection. Most data transferred on the Internet consists of fullsize Ethernet frames, accounting for about 10% of the packets but 37% of the traffic. Several other packet sizes occurred more frequently than normal (where normal is defined as more than 0.5% of all packets). In order of frequency,
22、they are 52, 1420, 44, 48, 60, 628, 552, 64, 56, and 1408 bytes. About 1.2% of all packets were smaller than 40 bytes (e.g., 28, 32 bytes). They represent a small percentage of overall traffic (0.1%), but a router will nevertheless need to forward these very small packets. A realistic mixture of pac
23、ket sizes can be approximated by a set of packet lengths (three or more) that represent the common modal lengths, plus an even distribution of every other packet size. (The number of modal lengths determines the accuracy of the packet mixture - i.e., its correlation to a set of real measurements.) T
24、hree traffic models are described below: Simple IMIX, Complete IMIX, and Accurate IMIX. The following Simple IMIX packet size mixtures are used for purpose of this document: Table C.1 Simple IMIX Packet Size (Bytes) Proportion of Total Bandwidth (Load) 40 7 parts 6.856%576 4 parts 56.415% 1500 1 par
25、t 36.729%Some router manufacturers commonly use this mixture as a “quick and dirty“ approximation of the Internet packet mixture. ATIS-0600015.13.2017 11 The Simple IMIX has an average packet size of 340.3 bytes and a correlation value of 0.892 when compared to realistic Internet traffic. Complete I
26、MIX This mixture retains the simplicity of the Simple IMIX but includes an additional set of packets, representing all other packet sizes. This set includes a random mix of packet lengths in a flat distribution (equal probability of each size), ensuring that some non-zero number of packets of every
27、size are offered to the EUT. Table C.2 Complete IMIX (Informative) Packet Size (Bytes) Proportion of Total Bandwidth (Load) 40 55.0% 5.15%576 15.0% 20.25%1500 12.0% 42.20% 40 - 1500 (range) 20.0% 32.40% The Complete IMIX has an average packet size of 427.0 bytes and a correlation value of 0.985 when
28、 compared to realistic Internet traffic. This mixture has an average packet size of 404.5 bytes and has a correlation value of 0.999 when compared to realistic Internet traffic. Accurate IMIX This mixture has an average packet size of 404.5 bytes and has a correlation value of 0.999 when compared to
29、 realistic Internet traffic. Table C.3 Accurate IMIX (Informative) Packet Size (Bytes) Proportion of Total Bandwidth (Load) 28 1.20% 0.08%40 35.50% 3.51%44 2.00% 0.22% 48 2.00% 0.24%52 3.50% 0.45%552 0.80% 1.10% 576 11.50% 16.40%628 1.00% 1.50%1420 3.00% 10.50% 1500 10.00% 37.10%40 - 80 (range) 10.8
30、0% 1.60% 80 - 576 (range) 11.80% 9.60% 576 - 1500 (range) 6.90% 17.70% ATIS-0600015.13.2017 12 Table C.4 Additional IMIX Information Reference Title http:/.nz/wits/index.php Sample internet traffic can be found at the URL http:/ The Journal of Internet, Test Methodologies, Agilent Technologies http:/ IXIA Library: Test Plans, Broadband PPPoX and L2TP Testing
