Unlike conventional flexible cable construction the primary features offered by National Wire & Cable data cables are the high and accurately controlled characteristic impedance of every pair, regardless of its position n the cable and special geometry chosen to reduce crosstalk. 1. Less crosstalk and noise from mismatched loads, due to proper matching. 2. Uniform light loading on drivers allows direct I.C. drive, accurate prediction of current demands from power supply, and driver power dissipation. 3. Proper load match reduces re-flection and inversion noise where driver end is not matched to line (Typical of TTL.) 4. Special geometry and pair construction provides exceptionally close capacitance balance between pair wires, reducing differential crosstalk. We recommend use of balanced drive and differential-input line receivers for lowest crosstalk and best pulse reproduction, utilizing the 110 ohm balanced impedance of the pairs. With such a system, TTL speeds have been used in D-200 cable at 1 mc data rates over 1000 ft.
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