. The Bell System technical journal . SINGLEFREQUENCY SIGNALING CIRCUITRG HilK? I—vw- _^.iH^r;Ta SWITCHCROSSPOINTS >h- EORF RTl HS1OR ORRT2 HS2 HG1 ORHG2 n HGtOR HG2 A ORB RELAY DESIGNATIONS:--1 ARE INCOMING LOW TO HIGH--2 HIGH TO LOW H CCI ORCC2 E OR HG1 OR HG2 H A OR B J I INCOMING TRUNK CONTROLLER Fig. 9 — Outgoing trunk seizure and continuity check. 320 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 To insure that continuity exists through the switch a check is made bymaking the advance of the controller dependent upon receiving a signalfrom the distant end. The os relay, Fig. 9, in the
. The Bell System technical journal . SINGLEFREQUENCY SIGNALING CIRCUITRG HilK? I—vw- _^.iH^r;Ta SWITCHCROSSPOINTS >h- EORF RTl HS1OR ORRT2 HS2 HG1 ORHG2 n HGtOR HG2 A ORB RELAY DESIGNATIONS:--1 ARE INCOMING LOW TO HIGH--2 HIGH TO LOW H CCI ORCC2 E OR HG1 OR HG2 H A OR B J I INCOMING TRUNK CONTROLLER Fig. 9 — Outgoing trunk seizure and continuity check. 320 THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 To insure that continuity exists through the switch a check is made bymaking the advance of the controller dependent upon receiving a signalfrom the distant end. The os relay, Fig. 9, in the outgoing trunk isoperated directly by a ground on one of the contacts of the crosspoint,and opens the operating path of the select magnets and ss relay (shownin Fig. 7). The release of the ss relay causes the operation of the cprelay shown in Fig. 8. The operation of the cp relay changes the potentialconnected to the winding of the hs relay from ground to about — The operation of the os relay is the outgoing trunk send
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
