The analog carrier systems used in the loop plant fall into two distinct groups: the single-channel systems that piggyback a carrier channel on top of an existing voice channel and the multichannel
The loop electronics overview to this issue1 examines the need for pair gain systems in the loop plant and traces the history of these systems.
A watchword in our telephone system today is reliability. Since the loop is an element in every customer's telephone circuit, its reliable performance is essential.
Overview By F. T. ANDREWS, JR.
Although electronics technology has been used for many years in the central offices and toll plant of the Bell System, its use in the loop plant is in its infancy.
Planning for loop electronics in the Bell System responds to at least two distinct, but interrelated, areas of need.
The Loop Switching System By N. G. AVANEAS and J. M.
Voice Frequency Electronics for Loop Applications By G. T. HAWLEY and K. E.
A Model of Cable Pairs Added at the Main Frames for a Large Entity By W. N. BELL and S.
As described by N. G. Long 1 (this issue), the feeder portion of the overall loop plant consists of cables, conduit, and various other hardware.
