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Wiki User
∙ 6y agoIn the US many large cities implemented local dialing and eliminated local operators in the late 1920s, but such dial switching systems were too expensive for use in towns and rural communities.
Beginning in the 1950s less expensive dial switching equipment permitted the elimination of local operators in most places in the US.
However long distance calls still required long distance operators, because there was no standardization of phone numbers (they varied in length from 4 to 6 digits depending on the city or town).
By the early 1960s Direct Distance Dialing (DDD) was implemented along with 3 digit area codes and standardized 7 digit phone numbers almost everywhere in the US and Canada. Whitehorse, Yukon in Canada was one of the last to support DDD in 1972. Full implementation of DDD allowed the elimination of long distance operators.
A small number of operators do still remain today, for handling special types of calls (e.g. person to person).
Wiki User
∙ 6y agoIn the late1980’s the phone systems went automatic without operators.
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What is the difference between cellular telephones and cordless telephones?
Cellular Telephones is using the Integrated Services Digital Network ISDN while the Cordless Telephone is using the Public Switched Telephone Network PSTN, same with ordinary telephone.
What can stop the machines?
The machine operator can stop machines.
How pointer is declared using address operator?
int *ptr; PS: I don't know what do you mean by 'using address operator'
What is the importance of using telephones?
to stay in touch with friends, family and the people around
How are old telephones are similar to new telephones?
The are many differences between old fashioned telephones and modern ones. The first phones didn't do much more than dialing a switchboard operator, they would connect you to your call. Since then, we have gone wireless, and can pretty much do anything with our phones.
How do you define power function without using operator?
using pow() function.. ..
How did telephones work in the industrial times?
The earliest telephones had a direct wire connection to a local central switchboard. By turning the crank attached to the phone (no push buttons or dials back then) you notified the operator of the switchboard that you wanted to make a call. You then told her which person and number you wanted to reach and she then made the connection.
Name three ways that satellites are used for communication?
Using telephones, watching television and radio
How do you find the greatest of three numbers using ternery operator?
Compare the first two numbers with the ternary operator. Store the result in a temporary variable. Compare the temporary variable with the third number, again using the ternary operator.
What are the Enviormental impacts with using a telephones?
there not major environmental concers with using the telephones but when you have system of cables interconnected under the soil might create problems in the future as you have to dig up the land when there is a problem in the wires beneath the soil otherwise there is not much of big deal.
What are the safety requirements for using a manlift?
The safety requirements for using a manlift include but are not limited to ensuring the operator is using fall protection and checking that the operator is alert and in proper condition to use the equipment. It is also important to be certain the operator is properly trained for using a manlift as incorrect use may comprise the safety of many people.
What is telephones plural possessive?
Telephones'
