Telephone Traffic

Telephone Traffic


an arbitrary quantity that is a function of the number of calls coming in to a telephone central office from the subscribers of a telephone network per unit time and of the time required for each call, that is, the time required for connection, conversation, and disconnection. The telephone traffic is measured in terms of a unit equal to the traffic created by calls that occupy a period of one hour. The most important characteristic of the telephone traffic is the intensity, equal to the product of the mathematical expectation of the number of calls coming in per unit time and the average time required for a call. Intensity is measured in terms of the erlang, which is equal to the traffic whose calls, if placed end to end, would keep one channel continuously occupied.

The telephone traffic varies over a wide range with the month of the year, day of the week, and hour of the day. The 60-minute interval during the day when the traffic is heaviest (on the average, after many days of measurements) is called the busiest hour. The traffic during this hour exceeds the average hourly traffic by a factor of 2–5, and in large cities the traffic of the busiest hour constitutes one-tenth of the total daily traffic. Statistical studies of traffic characteristics, carried out among identical groups of subscribers, make possible an analysis of the traffic and the busiest hour with regard to such considerations as volume, time of day, and communication channels. From these data, the values of traffic intensity can be calculated that are used in place of average values in designing telephone networks. These values help to determine the amount of switching equipment and the number and distribution of channels needed to ensure a particular level of service.


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References in periodicals archive ?
Although there are now only about 15 cities in this country which have enough telephone traffic of a nature to justify its use under present condition, the coaxial cable--a copper tube with a concentric wire inside--has an amazing capacity for the transmission of conversations.
Telephone subscriptions, Primary access connections, Basic access and analog access, Incoming telephone traffic and routing of outgoing telephone communications from said jura dpo accesses.
Laying of transnational fiber-optic communication lines continues with the aim of expanding the interstate telephone traffic.
All the 14 long distance and international (LDI) licence-holding operators formed a consortium which through an agreement had allowed the PTCL to manage the incoming telephone traffic and, in return, receive their proportionate share in the income.
Javed Ikhlas said that to curb grey traffic, a technical system has been deployed for monitoring and reconciliation of International Telephone Traffic with the funding of Long Distance and International.
The move comes just two years after the US blocked a move to allow the International Telecommunication Union (ITU), a United Nations affiliate that oversees global telephone traffic, to take control of ICANN.
Parliamentary Secretary for Information Technology told the house that Grey Traffic Mitigation System has been deployed for monitoring and reconciliation of international telephone traffic.
The PTA sources on Tuesday said to curb grey traffic, a Technical System has already been deployed for monitoring and reconciliation of International Telephone Traffic with funding of Long Distance & International (LDI) operators in the light of International Clearing House (ICH) Policy Directive issued by Ministry of IT last year.
The telephone traffic was between the two men in the dock at Cardiff Crown Court and the alleged "third man" in the case, who it is being claimed, paid them to attack that day.
The deal, which covers joint projects in procurement, research and development of new services and telephone traffic management, is similar to one struck by Telefonica with France's Bouygues recently.
Davutoglu said he would have high-level talks with all the relevant parties in Lebanon, including representatives of Hezbollah, adding telephone traffic with France also continued.