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Dear Steve, Twinax communication over UTP cabling is very susceptible to failure due to electrical interference from outside sources near the cabling infrastructure. You can download a white paper (pdf document) from IBM's web site http://www.networking.ibm.com/pdf/emexptr.pdf titled Technological Advances in Twinax Communications (published Sept. 1997). The white paper is 14 pages long and it includes all the IBM recommended cabling distances by media type on pages 12 & 13. The specifications for CAT 3 and CAT 5 UTP cabling to carry the standard IBM Twinax Data Stream are listed in the IBM publication GA27-3749 IBM 5299 Terminal Multiconnector Model 3 Planning, Setup, and Maintenance Guide. The specifications from Appendix B: of publication GA27-3749 are listed below: ? #22 or #24 AWG (American Wire Guage) ? Solid copper twisted-pair wires with at least two twists per 307.7 millimeters (12 inches) ? A maximum of 28.6 ohms dc resistance per 304.8 meters (1000 feet) ? Impedance characteristics - 90 to 120 ohms at 256 kHz - 87 to 117.5 ohms at 512 kHz - 85 to 114 ohms at 772 kHz - 84 to 113 ohms at 1000 kHz ? Maximum attenuation per 304.8 meters (1000 feet) - 4.00 dB at 256 kHz - 5.66 dB at 512 kHz - 6.73 dB at 772 kHz - 8.00 dB at 1000 kHz ? In addition, all Type 3 Specified Media must meet at least one of the following industry specifications: - ANSI/ICEA S-80-576-1983 - REA PE-1 - Bell System 48007 Possible Interference Sources The network configurations described in this document have been tested and shown to be operational in typical office environments. However, these configurations may not operate satisfactorily in environments where electrical interference exists. You must consider those environments exposed to interference when planning your network configuration. Telephone twisted-pair cable is unshielded and is generally not well balanced at high frequencies. Therefore, this type of wiring is subject to crosstalk and electrical interference from the following: ? Intercoms ? Fluorescent lighting ? Power cables ? Arc welding equipment ? HVAC (heating, ventilation, and air conditioning) equipment ? Radio frequency transmissions from commercial broadcasters and base-station operations ? Radar installations in the immediate area ? Electric Motors .. In addition, the telephone cable data network must be contained within a single building. Any cable runs between buildings are not supported. Network operation with nonspecified wiring, jacks, plugs, connecting blocks, or cable run-lengths may be unsatisfactory and is not recommended or supported. HTH Best Regards, /Paul -- Paul Tykodi Principal Consultant TCS - Tykodi Consulting Services LLC E-mail: ptykodi@xxxxxxxxxx >date: Fri, 4 Mar 2005 07:29:28 -0000 >from: "Raby, Steve \(GE Advanced Materials, >consultant\)" <steve.raby@xxxxxx> >subject: 6400 Printer problem > >Hello All, > >I have a problem with some of the 6400 printers I have >here, they are stuck on Vary on Pending, they are >connected to the network by a 'balloon', other >printers on the same controller are working fine. I >have varied off and on, unplugged from the network, >switched on and off, I just don't know why the things >refuse to work. > >Steve ===== Paul Tykodi Principal Consultant TCS - Tykodi Consulting Services LLC Tel/Fax: 603-343-1820 Mobile: 603-866-0712 E-mail: ptykodi@xxxxxxxxx WWW: http://www.tykodi.com __________________________________ Celebrate Yahoo!'s 10th Birthday! Yahoo! Netrospective: 100 Moments of the Web http://birthday.yahoo.com/netrospective/
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