公开(公告)号：US3571798A

公开(公告)日：1971-03-23

申请号：US3571798D

申请日：1968-11-13

Applicant: IBM

Inventor： DAWSON GLENN E ,  TEIG MICHAEL

IPC: H04M11/06 ,  G06F13/40 ,  H04M11/00 ,  H04Q3/64

CPC classification number: G06F13/4022

Abstract: A two level switching system to be used in communications systems, comprising a first means for placing a plurality of input lines in a Hold Mode of operation, a second means for maintaining a plurality of input lines in an Operating Mode of operation, and means for connecting and disconnecting input lines in an Operating Mode of operation into a Hold Mode of operation at the initiation of the user or of the system itself.

公开(公告)号：CA903361A

公开(公告)日：1972-06-20

申请号：CA903361D

Applicant: IBM

Inventor： TEIG MICHAEL ,  DAWSON GLENN E

IPC: G06F13/40 ,  H04Q3/64