Electrical Engineering by E.E. Kimberly

By E.E. Kimberly

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Equipment designers may not be too interested in the specifications of this cable until they come to design a LAN or telecom port interface; then the cable becomes important. 7. The standard allows for a series of categories with increasing bandwidth. Cat 5 and Cat 5e are popular and have been widely installed. Other characteristics, particularly mechanical dimensions, crosstalk performance (extended for Cat 5e and 6), and propagation delay skew are also defined in the standard. 6 Characteristics of Data Transmission Cables Cable type Inter-conductor capacitance (pF/m) Conductor-screen capacitance (pF/m) Characteristic impedance (U) Voltage rating (V) Ribbon: Round: Straight Twisted pair Type A Type B 50 72 40–115 41–98 – – 66–213 72–180 105 300 105 300 – 300 50 30 Type A: multi-pair/multicore overall foil screened cable.

Strictly speaking, crosstalk is not only a cable phenomenon but refers to any unwanted interaction between nominally un-coupled channels. The coupling can be predominantly either capacitive, inductive, or due to transmission-line phenomena. B. Cowdell, IEEE EMC Symposium, 1979, p. 24. In the worst case where the capacitive coupling impedance is much lower than the circuit impedance, the crosstalk voltage is determined only by the ratio of circuit impedances. 24 Crosstalk equivalent circuit 32 CHAPTER 1 Grounding and wiring Digital crosstalk Crosstalk is well known in the telecomms and audio worlds, for example where separate speech channels are transmitted together and one breaks through onto another, or where stereo channel separation at high frequencies is compromised.

This offers a good general-purpose electrical shield but cannot give 100% shield coverage (80–95% is typical) and it increases the size and weight of the cable.  tape or foil. The most common of these is aluminized Mylar. A drain wire is run in contact with the metallization to provide a terminating contact and to reduce the inductance of the shield when it is helically wound. This provides a fairly mediocre degree of shielding but hardly affects the size, weight and flexibility of the cable at all.

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