High speed fiber optics local area networks: Design and implementation

The design of high speed local area networks (HSLAN) for communication among distributed devices requires solving problems in three areas: (1) the network medium and its topology; (2) the medium access control; and (3) the network interface. Considerable progress has been made in all areas. Accomplishments are divided into two groups according to their theoretical or experimental nature. A brief summary is given in Section 2, including references to papers which appeared in the literature, as well as to Ph.D. dissertations and technical reports published at Stanford University

Throughput analysis of the IEEE 802.4 token bus standard under heavy load

It has become clear in the last few years that there is a trend towards integrated digital services. Parallel to the development of public Integrated Services Digital Network (ISDN) is service integration in the local area (e.g., a campus, a building, an aircraft). The types of services to be integrated depend very much on the specific local environment. However, applications tend to generate data traffic belonging to one of two classes. According to IEEE 802.4 terminology, the first major class of traffic is termed synchronous, such as packetized voice and data generated from other applications with real-time constraints, and the second class is called asynchronous which includes most computer data traffic such as file transfer or facsimile. The IEEE 802.4 token bus protocol which was designed to support both synchronous and asynchronous traffic is examined. The protocol is basically a timer-controlled token bus access scheme. By a suitable choice of the design parameters, it can be shown that access delay is bounded for synchronous traffic. As well, the bandwidth allocated to asynchronous traffic can be controlled. A throughput analysis of the protocol under heavy load with constant channel occupation of synchronous traffic and constant token-passing times is presented

Design and implementation of interface units for high speed fiber optics local area networks and broadband integrated services digital networks

The design and implementation of interface units for high speed Fiber Optic Local Area Networks and Broadband Integrated Services Digital Networks are discussed. During the last years, a number of network adapters that are designed to support high speed communications have emerged. This approach to the design of a high speed network interface unit was to implement package processing functions in hardware, using VLSI technology. The VLSI hardware implementation of a buffer management unit, which is required in such architectures, is described

Capacity of an IEEE 802.11b wireless LAN supporting VoIP

In this paper we evaluate the capacity of an IEEE 802.11b network carrying voice calls in a wide range of scenarios, including varying delay constraints, channel conditions and voice call quality requirements. We consider both G.711 and G.729 voice encoding schemes and a range of voice packet sizes. We first present an analytical..

IP Routing and Mobility

The original design of the Internet and its underlying protocols did not anticipate users to be mobile. With the growing interest in supporting mobile users and mobile computing, a great deal of work is taking place to solve this problem. For a solution to be practical, it has to integrate easily with existing Internet infrastructure and protocols, and offer an adequate migration path toward what might represent the ultimate solution. In that respect, the solution has to be incrementally scalable to handle a large number of mobile users and wide geographical scopes, and well performing so as to support all application requirements including voice and video communications and a wide range of mobility speeds. In this paper, we present a survey of the state-of-theart and propose a multi-layer architecture for mobility in IP networks. In particular, we propose the use of extended local area networks and protocols for efficient and scalable mobility support in the Internet

A Novel Efficient Technique for Traffic Grooming in WDM SONET with Multiple Line Speeds

SONET rings remain the dominant optical transport architecture in the metropolitan area. To support traffic growth on these rings, WDM technology is used to provide multiple SONET rings on the same fiber, each SONET ring running on a separate wavelength. Traffic grooming refers to intelligently arranging low speed traffic streams onto different SONET rings and selecting the proper line speed for each wavelength so as to minimize certain cost objective, such as the total cost of electronic Add-Drop Multiplexer (ADM) equipments used. The problem can be formulated as an Integer Linear Programming (ILP) problem by generalizing the formulation in [1] [2] to support multiple line speeds. Unfortunately, solving the ILP directly could be very computation intensive. In this paper, we propose a non-linear formulation instead, and then solve it by decomposing it into several smaller ILP subproblems, each can be solved separately by an ILP solver. Decomposition allows us to exploit the symmetry in the problem structure, and cut down the solution space dramatically, therefore, reducing the computation time to solve a problem. Even if we may have to terminate the computation early for large size problems, decomposition allows us to explore a larger portion of the solution space in a given amount of time, therefore, obtain better results