. The Bell System technical journal . OperationAs might be expected, the speed with which connections can bemade through tandem systems varies considerably, depending uponthe type of arrangement employed. Table II indicates the relativetheoretical speed of operation, in seconds, of some of the more commontandem arrangements. Direct trunks frorn the tandem equipmentto the called office (distant city, in the case of toll office tandems) areassumed; if sub-tandems are involved, a small amount of additionaltime is required. Also a slight additional time is involved, in thecase of step-by-step tand
. The Bell System technical journal . OperationAs might be expected, the speed with which connections can bemade through tandem systems varies considerably, depending uponthe type of arrangement employed. Table II indicates the relativetheoretical speed of operation, in seconds, of some of the more commontandem arrangements. Direct trunks frorn the tandem equipmentto the called office (distant city, in the case of toll office tandems) areassumed; if sub-tandems are involved, a small amount of additionaltime is required. Also a slight additional time is involved, in thecase of step-by-step tandems, if repeaters must be dialed in. Use of Tandem Systems in Toll Board Operation While tandem systems have been developed primarily for local and short-haul toll station-to-station traffic handled on manual or dial A boards, arrangements have been provided in a number of cities which give toll board operators access to existing tandem systems in ■ RTFORD-VALLEy OFFICEHARTFOno-EIGHT OFFICE HARTFORD-ELIZABETHSERVICE CODE SELECTORS. Fig. 10—Connecticut step-by-step tandem syste; TER-TANOEM TRUNKSNAL INTER-TANDEM TRUNKSEDIATE DIALING AT STAM-FORD DIAL SYSTEM A BOARD
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
