>From: Muralikrishnan Gopalakrishnan <[email protected]> >Subject: Frequency response of Copper outside plant > >We are in the process of developing a high data rate modem on copper. (Not >involving the CO. Hence we do not have the 4KHz limitation). > >We need info. regarding the frequency response of standard copper cable >(24 - 18 AWG) at higher frequencies (Say 0 to 8 MHz). Could somebody help >in directing us to sites/books/journals?
Murli, Standard voice grade copper cable should conform to TIA 568A Category 3 requirements, which are (briefly): Characteristic Impedance: 100 Ohms (+- 15%), 1 to 16 MHz Structural Return Loss: 12 dB (worst pair), 1 to 10 MHz Attenuation (loss/100 meters): MHz dB ------ ---- 0.772 2.2 1.0 2.6 4.0 5.6 8.0 8.5 10.0 9.7 16.0 13.1 Near-End Crosstalk Loss: MHz dB ------ ---- 0.772 43 1.0 41 4.0 32 8.0 27 10.0 26 16.0 23 ------------------------------------------------------------------ John Combs, Senior Project Engineer, ITS/TestMark Laboratories Email: [email protected] URL: http://www.testmark.com ------------------------------------------------------------------
