TM 11-2087: Switchboards SB-53/FTC and SB-53A/FTC

TM 11-2087 Switchboards SB-53/FTC and SB-53A/FTC

TM 11-2087

Switchboards SB-53/FTC and SB-53A/FTC

Army · TM · Jan 1930 · 120 pages

About

a make contact of the line jack to com- plete the circuit to ground for the oper- ation of relay 2. A make contact of relay 2 completes the trunk loop through windings (8-7 and 6-5 in series) of the repeating .coil to signal the distant operator. (2) To magneto exchange. The trunk circuit to a magneto exchange functions as described for the common battery ex- change, except that the operator must ring to signal the distant office. (3) Todialexchange. Tocalla dial exchange, a calling cord plug is inserted into a trunk line jack and the dial cord. plug into the dial jack. Insertion of the dial cord plug opens the dial jack break con- tact. This action disconnects the trunk equipment and connects the dial to the trunk line. Operation of the dial trans- mits pulses to the called office through the dial jack. Immediately after dialing, the dial cord is removed. 6. Incoming Calls.

DesignationTM 11-2087

EditionJan 1930

StatusSuperseded

Pages120

FunctionComms Signal

CollectionHistoric

Public domain (U.S. Government work)

References 90

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