"Transmission performance" can be likened to the carrying capacity of a highway. Initially, each open-wire circuit-consisting of a pair of wires-could only transmit a single voice call and one telegraph signal. With the introduction of carrier technology and carrier telephony, the number of simultaneous voice channels that could be transmitted over a single open-wire line increased significantly; in my country, it eventually became possible to support over 350 simultaneous voice channels on a single open-wire line.
While erecting an open-wire line might seem as simple as planting a utility pole and stringing wires, the construction process is, in fact, a highly specialized task. It requires accounting for factors such as signal attenuation, electromagnetic interference, and the structural stability of the poles. Furthermore, construction must take into account local environmental conditions, including soil composition and prevailing wind speeds.
Consequently, the installation of open-wire lines requires professional design by experts. The process demands precise measurement and meticulous execution based on detailed construction blueprints. Tasks such as determining where wires should cross, calculating the required depth for burying poles, deciding on the number of guy wires needed for reinforcement, specifying how conductors should be secured, and installing dedicated lightning protection wires-all of these must be carried out by a professional construction team.
