国立北平大学工学院电话讲义.pdf电子版

目录简介

目录

general

automatic exchange systems

classes of service

size of exchange

traffic information

trunking diagrams

traffic tables

primary trunking

plunger primary lineswitches

rotary primary lineswitches,25-point

line-finder switches

local secondary trunking

plunger local secondary lineswitches

rotary local secondary lineswitches,25-point

selector trunking

selectors to selectors-four-digit system

selectors to selectors-five and six-digit systems

selectors to reverting call switches

selectors to connectors

selectors to toll recording trunks

selectors to information,repair clerk,test desk,etc

interoffice trunking

selectors to one-way repeaters

selectors to two-way repeaters

selectors to plunger outgoing secondary lineswitches

selectors to 25-point rotary outgoing secondary lineswitches

plunger outgoing secondary lineswitches to repeaters

rotary outgoing secondary lineswitches to repeaters,25-point

toll train trunking

toll switchboard to toll selectors-three-digit train

toll switchboard to toll selectors-four-digit train

toll switchboard to incoming coin box toll selectors

toll selectors to toll selectors

toll selectors to toll connectors

miscellaneous trunking

manual switchboard to inco......