Transmitting/receiving system between pbx's

Details Transmitting/receiving system between pbx's Transmitting/receiving system between pbx's

H - Electricity

04

M

344/18

H04M 3/42 (2006.01) H04M 1/00 (2006.01) H04M 3/00 (2006.01) H04M 7/00 (2006.01) H04Q 3/42 (2006.01)

Patent

CA 2036998

TRANSMITTING/RECEIVING SYSTEM BETWEEN PBX'S ABSTRACT OF THE DISCLOSURE A system having two PBX's each provided with a plurality of ISDN terminal equipment and having, between the PBX's, a plurality of analog junction lines and analog tie trunks provided at the two ends of the analog junction lines, wherein the PBX's are provided with analog junction line-ISDN converting units. The analog junction line-ISDN converting units are operative to transfer B-channel signals on a first analog junction line through the PBX network and the analog tie trunks and to transfer D-channel signals on a second analog junction line.

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