Understanding Hierarchical Telephony Networks: Structure and Function
Understanding Telephony Network Hierarchy
The plants are tied together by bonds, which depending on the type of traffic that they are entered, you can classified as:
– Outbound Links. Course called output of the plant.
– Links of arrival. They’re going to get calls from other plants
– Bidirectional links. Are capable of acting both as output links Ecomo Arrival Due to a growing number of user lines, and therefore the number of plants, we again raised a problem of power interconnections to all users but this time with the focus for these users, which are created to solve what are known as transit stations.
The hierarchical network is a pyramidal structure in which each plant takes one step in the pyramid, and is attached to the centrality of the step immediately above and below. Plants that form the hierarchical network are:
– Central Tertiary. 
Plants are more network hierarchy, the connecting secondary stations that depend on them, also known as nodal stations.
– Central high school. 
the connecting link circuits primary power plants that depend on it, depends in turn on a central tertiary secundariacoincide area with the province.
– Central Elementary. 
connecting the circuits linking local exchanges, is in turn a secondary central
– Central local. 
lines are connected users, which switches between each other if local calls, routing outgoing calls to the primary hub to which it belongs.
The path is established between two users according to the hierarchical network is called final route, this being formed by what are called final sections. The final sections depending on the category of plants to which together are: section quaternary, tertiary, secondary, primary, online user and user.
For better utilization of the network, there is what is called the complementary network, which relies on the direct sections. These sections will connect core according to the hierarchical network model, should not be linked directly, if the premise that these plants do not differ more than one step.is allowed to exist only directly from one central section of the same rank, for example, a primary central sections can only be directly with other primary, secondary and with local exchanges.
A direct application of sections is given in what is known as areas multicenter, which is one in which a single population, and because of its large number of users we found that in order to give the telephone service is needed more than one local exchange, these local exchanges as well as being linked to their corresponding primary, are often connected by direct sections. A populations or areas where there is only one local exchange to serve their users, they are called unicentrales areas.
Also central are available internationally, which is responsible for communicating with other countries, central telephony, which are supported by a base station or remote center, power from other operators, and connecting these with the hierarchical network is done through border plants, usually a secondary or tertiary education.