. The Bell System technical journal . ^ of the No. 4 toll crossbarswitching system- may not be economical. The application of crossbar tandem two-wire switching systems atprimary and sectional centers has been made possible by the extendeduse of high speed carrier systems. The echoes at the 2-wire crossbartandem switching offices can be effectively reduced by providing a high CROSSBAR TANDEM AS A TOLL SWITCHING SYSTEM 95 office balance and by the use of impedance compensators and fixed well balanced two-wire switching system, proper assignment of inter-toll trunk losses, and the use of
. The Bell System technical journal . ^ of the No. 4 toll crossbarswitching system- may not be economical. The application of crossbar tandem two-wire switching systems atprimary and sectional centers has been made possible by the extendeduse of high speed carrier systems. The echoes at the 2-wire crossbartandem switching offices can be effectively reduced by providing a high CROSSBAR TANDEM AS A TOLL SWITCHING SYSTEM 95 office balance and by the use of impedance compensators and fixed well balanced two-wire switching system, proper assignment of inter-toll trunk losses, and the use of carrier circuits with high speed of propa-gation will permit through switching Mdth little or no impairment froman echo standpoint. The new features for crossbar tandem will provide arrangementsnecessary for operation at control switching points (CSPs). These in-clude automatic alternate routing, the ability to store and send forward. TP e I I NC = NATIONAL CENTERRC = REGIONAL CENTER/\ SC = SECTIONAL CENTER( J PC = PRIMARY CENTER Fig. 2 — Homing arrangement for local central offices and toll centers. TC = TOLL CENTERTP = TOLL POINTEG = END OFFICE
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
