1、STD.EIAEIA-364-90-ENGL200032346000%35933555NOTICEEJA Engineering Standards and Publications are designed to serve the public interest througheliminating misunderstandings between manufacturers and purchasers,facilitatinginterchangeability and improvement of products,and assisting the purchaser in se
2、lecting andobtaining with minimum delay the proper product for his particular need.Existence of suchStandards and Publications shall not in any respect prcclude any member or nonmember of ELAfrom manufacturing or selling products not conforming to such Standards and Puhlications,norshall the existen
3、ce of such Standards and Publications preclude their voluntary use by those otherthan EIA members,whether the standard is to be used either domestically or intemationally.Standards and Publications are adopted by ETA in accordance with the Amcrican NationalStandards Institute(ANSI)patent policy.By s
4、uch action.EIA does not assume any liability toany patent owner,nor does it assume any obligation whatever to parties adopting the Standard orPublication.This ELA Standard is considered to have International Standardization implication,but theInternational Electrotechnical Commission activity has no
5、t progressed to the point where avalid comparison between the EIA Standard and the IEC document can be made.This Standard does not purport to address all safety problems associated with its use or allapplicable regulatory requirements.It is the responsibility of the user of this Standard toestablish
6、 appropriate safety and health practices and to determine the applicability of regulatorylimitations before its use.(From Standards Proposal No.3404,formulatcd under the cognizance of the CE-2.0 NationalConnector Standards Committee.)Published byELECTRONIC INDUSTR应S ALLIANCE2O00Engineering Departmen
7、t2500 Wilson BoulevardArlington,VA 22201PRICE:Please refer to the currentCatalog of EIA,Electronte Industries Alliance Standards and Engineering Publicationsor call Global Engineering Documents,USA and Canada(1-800-854-7179)International(303-397-7956)All rights reservedPrinted in U.S.A.STD.EIAE1A-36
8、4-90-ENGL2000323460006389362b4EIA-36490Page 1TEST PROCEDURE No.90CROSSTALK RATIO TEST PROCEDUREFORELECTRICAL CONNECTORS.SOCKETS,CABLE ASSEMBLIES OR INTERCONNECT SYSTEMS(From EIA Standards Proposal No.3404,formulated under the cognizance EIA CE-2.0Committee on National Connector Standards)1 Introduct
9、ion1.1 ScopeThis procedure applies to interconnect assemblies,such as electrical connectors,sockets andcable assemblies.1.2 ObjectThis standard describcs test methods for measuring the magnitude of the electromagneticcoupling between driven and quiet lines of an interconnect assembly.Both time domai
10、n(method A)and frequency domain methods(method B),single-ended and differentialtransmission,and insertion and reference fixture techniques are described.1.3 Definitions1.3.1 Drive signalFor the time domain method,the drive signal is a step waveform.For the frequency domainmethod,the drive signal is
11、sinusoidal.1.3.2 Crosstalk ratioThe ratio of the signal coupled(induced)into the quiet signal conductor or conductor pair to themagnitude of the signal in the driven conductor or conductor pair.Both signais shall have thesame units of either voltage or current,and the ratio may be expressed as percent or dB.1.3.3 Near end crosstalk ratio(NEXT)The crosstalk ratio calculated on the quiet line at or in proximity to the sending(signal source)end of the driven line.This is the ratio of the near end quiet line signal amplitude to the near enddriven line signal amplitude.
