These voltage changes on the trunk circuit would cause pops or clicks that were audible to the subscriber as the electrical handshaking stepped through its protocol.
12.
To alleviate the burden, phone companies are considering adding more hardware, like switches and trunk circuits, and designing new connections between switches and trunks, the patent says.
13.
For a long distance call, she plugged into a trunk circuit to connect to another operator in another bank of boards or at a remote central office.
14.
Probably the most common form of communicating dialed digits between electromechanical switches was sending dial pulses, equivalent to a rotary dial's pulsing, but sent over trunk circuits between switches.
15.
The purpose of the VNL plan and five-level long distance switching hierarchy was to minimize the number of trunk circuits in a call and maximize the voice quality of the connections.
16.
In 1970 Amos E . Joel, Jr ., a Bell Labs engineer, invented a " three-sided trunk circuit " to aid in the " call handoff " process from one cell to another.
17.
Autovon originally used a four wire version of 5XB, with a more complex marker to implement its nonhierarchical Polygrid routing system, and trunk circuits with additional logic and data storage built in to implement preemption.
18.
With a clean FCG test, the call completion software told the " A " relay in the trunk circuit to operate, connecting its transmission and test hardware to the switching fabric and thus to the line.
19.
Previous systems used relays in the incoming trunk circuit to control ringing and to return busy tone . 5XB used a " ringing Selection Switch " ( RSS ), a crossbar switch with ten verticals, serving ten trunks.
20.
The card sorter of the 4A / CTS ( Number 4A Crossbar / Card Translator System ) allowed six digit translation of the trunk circuits to use, where separate circuit groups were used for different cities in the same area code, as in the case of Oakland and San Francisco.
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