A.X-占用信令發(fā)送點(diǎn),Y-設(shè)備占用點(diǎn),Z-B號(hào)碼發(fā)送起始點(diǎn) B.X-占用信令發(fā)送點(diǎn),Y-B號(hào)碼發(fā)送起始點(diǎn),Z-設(shè)備占用點(diǎn) C.X-設(shè)備占用點(diǎn),Y-占用信令發(fā)送點(diǎn),Z-B號(hào)碼發(fā)送起始點(diǎn)