公开(公告)号：US3914743A

公开(公告)日：1975-10-21

申请号：US30920772

申请日：1972-11-24

Applicant: BELL TELEPHONE LABOR INC

Inventor： FITCH SCOTT MCDOWELL ,  KOLENSKY LEO MICHAEL ,  PANEK JOSEPH CONRAD ,  RIFE DAVID CHARLES ,  SCHAEFER WALTER RUDOLPH

IPC: H04L12/00 ,  H04Q5/00

CPC classification number: H04L12/00

Abstract: A multipoint hub or junction unit has a main channel connected to a control station of a selective calling line and a plurality of branch lines, certain of the branch lines connected to downstream line stations and one branch line connected to a main channel of a downstream multipoint junction unit whose branches are connected to other line stations. Normally, downstream data signals from the control station are split by the hub and broadcast to all the branches, the signals to the downstream hub being split again. Upstream transmission on each branch is combined and propagates to the main line. The multipoint junction unit normally blocks upstream supervisory signals. When branch lines are to be tested, signaling equipment is connected into the main line and signals the hub to block all its branches, to select blocked branches to be tested and to unblock the selected branches to permit passage of upstream and downstream data and supervisory signals.

Abstract translation: 多点集线器或连接单元具有连接到选呼线路和多条分支线路的控制站的主通道，连接到下游线路站的某些分支线路和连接到下游多点的主通道的一条分支线路 分支连接到其他线路站的接线单元。 通常，来自控制站的下行数据信号由集线器分割并广播到所有分支，到下游集线器的信号再次被分离。 每个分支上的上行传输被组合并传播到主线。 多点连接单元通常阻止上行监控信号。 当要测试分支线路时，信号设备连接到主线路，并向集线器发出信号以阻止其所有分支，选择被阻止的分支，以解锁所选择的分支以允许上下游数据和监控信号通过 。