Telephone allotter circuit for equalizing circuit usage

Claim 1

In a telephone switching system having a main switching system to selectively connect telephone handsets, such main system including a plurality of ''''connectors'''' each having a control lead, plural groups of handsets connected to each connector, a distribution terminal assembly, and ''''fifth selectors'''' connected through said distribution terminal assembly to said connectors in a predetermined first choice wiring array, in combination therewith, an auxiliary control system for equalizing wear on the connectors, said auxiliary system having a switching network, permanent connections from each connector control lead to said network and auxiliary switching means within said network responsive to the seizure of said control leads, said auxiliary switching means being connected within said network to said control leads and having a potential source and means to connect said potential source to respective said control leads whereby as each control lead for each connector in each connector group is seized, used and released in a normal manner, a substitute barring potential is placed thereon and such barring potentials are maintained for all such seized control leads after the same become seized, used and released in the normal manner, and further having means to disconnect said potential source from said control leads and thereby disconnect said barring potentials from all said control leads associated with the connector group but only after all the control leads have been so seized, used and released whereby to insure that no connector in the group is seized, used and released again until all connectors in the group have been so utilized.