. The Bell System technical journal . c 5o 12C bo WIDE-BAND OPEN-WIRE PROGRAM SYSTEM 373. Fig. 19—Intermediate bridging station bay layout. 374 BELL SYSTEM TECHNICAL JOURNAL also in the high quality monitoring circuit to afford additional dis-crimination against unwanted high-frequency interference as, forexample, interference from the carrier channels. This arrangementof splitting the filter requirements enables a less expensive type ofline filter set to be employed. Overall Performance The initial application of this new program system was made ontwo transcontinental circuits between Chicago
. The Bell System technical journal . c 5o 12C bo WIDE-BAND OPEN-WIRE PROGRAM SYSTEM 373. Fig. 19—Intermediate bridging station bay layout. 374 BELL SYSTEM TECHNICAL JOURNAL also in the high quality monitoring circuit to afford additional dis-crimination against unwanted high-frequency interference as, forexample, interference from the carrier channels. This arrangementof splitting the filter requirements enables a less expensive type ofline filter set to be employed. Overall Performance The initial application of this new program system was made ontwo transcontinental circuits between Chicago and San circuit, referred to as circuit 1, was routed through Omaha andDenver over the central transcontinental line. The other circuit,referred to as circuit 2, was routed via St. Louis and Kansas City toDenver and thence over the same pole lead as circuit 1. The layoutof these two circuits is shown in Fig. 20. Circuit 1 was approxi-mately 2,395 miles long and was routed through 17 repeater stationsinvolving 23 amplifiers in tandem. Circuit 2 was approximately2,689 m
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