telecommunications industry associationtr-30.3/10-08-022

1 | TIA 30.3 Contribution | August 2010 All Rights Reserved © Alcatel-Lucent 2010

Document Cover Sheet

Project Number PN-3-0062-RV2

Document Title TCP/IP Performance under TIA 921A Impairments

Source Alcatel-Lucent

Contact Les J. Wu

Alcatel-Lucent

600 Mountain Avenue

Room 2b-219

Murray Hill, NJ 07974

Phone: 908-582-4964

Fax: 908-582-4964 Email: les.j.wu@alcatel-lucent.com

Distribution TR-30.3

For Incorporation Into TIA Publication X For Information

Intended Purpose of Document (Select one) Other (describe) -

The document to which this cover statement is attached is submitted to a Formulating Group or sub-element thereof of the Telecommunications Industry Association (TIA) in accordance with the provisions of Sections 6.4.1–6.4.6 inclusive of the TIA Engineering Manual dated October 2009, all of which provisions are hereby incorporated by reference.

Abstract

Preliminary measurements of TCP performance over the TIA 921A test suite

Telecommunications Industry Association TR-30.3/10-08-022Arlington, VA August 16 - 17, 2010

TCP/IP Performanceunder TIA 921A Impairments

Les Wu

August 2010

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Motivation and Caveats

Much video, especially over-the-top video is carried by TCP. Given this, one is interested in the theoretic performance of TCP under a particular network condition.

Given this, a set of measurements has been made using “iperf” using an Anue impairment generator across the TIA 921a impairment suite.

Note:

The results presented here are considered preliminary. There are some missing test cases and the tests need to be re-run and validated. This submission will be updated in the future after these runs have been completed.

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iperf

http://iperf.sourceforge.net/

Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.

Requires both a server as well as client to run

Sample Output (test case 164A):

------------------------------------------------------------Client connecting to 135.112.178.21, TCP port 5001TCP window size: 64.0 KByte (default)------------------------------------------------------------[ 3] local 192.168.26.64 port 53032 connected with 135.112.178.21 port 5001[ ID] Interval Transfer Bandwidth[ 3] 0.0-30.0 sec 24.2 MBytes 6.77 Mbits/sec

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Test Setup

iperf v2.0.5 server run on a Linux server box

iperf v2.0.5 client run on a WinXP box

Anue Systems GEM Network Emulator used to generate impairments

All interconnections and switch 1GbE

30s iperf test run:

iperf -t30 -l 1400 -c <target IP>

With no impairments, TCP test results on the order of 930-950Mbit.

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iperf Performance Results *** Preliminary ***

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Iperf Performance Results (detail)*** Preliminary ***

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TCP Test Result Performance Distribution

58% of A Profile test cases only support TCP bandwidth below 500kbit

<7% of A Profile results >2 Mbit

If these results are confirmed, this suggests the limitatiosn of TIA-921A

cases for practical video transport

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n Backup Data

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Preliminary Results File

ser2.zip

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iperf Performance Results *** Preliminary ***

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Iperf Performance Results (detail)*** Preliminary ***