Quality

Large scale telecommunications systems are characterized by a diverse set of subnetworks and a variety of services. The overall result of the operation in such an environment should be a guaranteed level of quality of service measured by a certain metric. Various metrics have been used which either directly define quantitatively the quality of service or define some constraints in the design or operation of the telecommunication system delivering such a service so that indirectly it leads...

Survivable Network Design

Strategies for survivable network design can be generally classified into three categories (1) prevention (2) network design and (3) traffic management and restoration. Prevention techniques can be used to improve the reliability of components and subsystems which comprise the fundamental building blocks of survivable networks. For example, the use of fault-tolerant architectures in network switches and provisions for backup power supplies in control systems can prevent disruptions as long as...

Wireless Outage Index

Before considering subsystem survivability metrics, this section discusses ongoing work of the T1A1.2 Working group, a T1 subcommittee that is sponsored by the Alliance for Telecommunications Industry Solutions and accredited by the American National Standards Institute to create network interconnections and interoperability standards for the United States. The primary function of the T1A1.2 Working Group is to study network survivability performance by establishing a framework for measuring...

Mobile wireless outage index

For wireless networks we can use a modified version of the ANSI Committee T1 outage index used for wireline networks, in order to incorporate the wireless customer registration. A mobile wireless customer has to register to establish a virtual connection to the mobile wireless service provider, whereas a wireline customer is always registered via the physical connection to the wireline service provider. For this reason, the mobile outage index is given by the sum of two outage indexes, one for...