Panel was installed in cities area abounding bodies still had chiral (non-dial) service. Calls from console offices to chiral offices appropriate PCI signals to acquaint the "B Board Apparatus Incoming" abettor or admission abettor the buzz number. The cardinal appeared on a lit affectation (or indicator). The abettor completed the alarm in the accepted way
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Calls from chiral offices to console offices appropriate the "A board" or approachable abettor to appeal the cardinal from the caller, affix to an abandoned block to the abroad barter and broadcast to the "B Board Chiral Admission Call" abettor the adapted number. The "B Board Chiral Admission Call" abettor would again key in the adapted number. The Console apparatus would again bureaucracy the admission and final frames to the alleged blast number.
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Calls from chiral offices to console offices appropriate the "A board" or approachable abettor to appeal the cardinal from the caller, affix to an abandoned block to the abroad barter and broadcast to the "B Board Chiral Admission Call" abettor the adapted number. The "B Board Chiral Admission Call" abettor would again key in the adapted number. The Console apparatus would again bureaucracy the admission and final frames to the alleged blast number.
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