L.Y. Kung

A network interface for real-time video services on a high-speed multimedia LAN

The authors present a method to integrate the uncompressed real time video data into high-speed multimedia LAN. They use a buffer insertion ring twisted-pair LAN to transfer the data. The video data will be transferred 30 frames/sec to get good video quality. A priority control scheme will make most of the real time data served first. It guarantees that the transmission delay falls into a tolerable range. A real-time input-buffer control scheme will always remove the oldest packet(s) instead of using input buffer limit (IBL) flow control. The authors also develop a user interface to make the system easier to operate. The systems complexity is hidden by the user interface.<<ETX>>

Distributed multichannel manufacturing automation protocol network

Advances in computing and other technologies have produced a significant and rapid increase in the demand for new communication services. The distributed multichannel manufacturing automation protocol (DMMAP) is a high speed LAN. It used the multichannel technique to aggrandize the network bandwidth, and used the distributed control policy instead of the centralized control of MMAP (multichannel manufacturing automation protocol). The authors discuss the DMMAP, how to manage many simultaneously received tokens, and how to decide which MAC frame should be transmitted first.<<ETX>>

Comparisons of buffer-insertion ring networks implemented by the mechanisms of multi-channel and multi-insertion-buffer

Due to the promotion of VLSI and switch technologies, many new elements can be added into the buffer insertion ring LAN in order to provide multimedia services with various priority. On the other hand, many advantages of fiber-optic technology can be utilized in LANs. These advantages include high data capacity and ability to transmit multiple channels using high-speed multiplexing mechanism. In this paper, the multiplexing capability and multiple dimensional buffering techniques drive the present analysis of buffer insertion ring LAN. It extends the work mentioned above by describing system architecture, operation, and performance characteristics of four kinds of buffer insertion ring adapters.

Symmetric design and topologies analysis for degree-3 connected network

This paper investigates a planar solution of the optimization problem that appears in the design of degree-three connected stucture for local area networks and also in the interconnection network for parallel machines. For every digraph on N vertices there are several solutions that produce the minimum values of the diameter and average distance between vertices. The geometrical approach used to characterize the optimal solutions greatly facilities the study of routing and reliability questions.<<ETX>>

A loss-free access control mechanism on high-speed buffer insertion rings

A loss free access control mechanism of buffer insertion rings is proposed to tackle the blocking problem of a finite receive buffer. This new mechanism takes advantage of the intermediate caching capability of a buffer insertion ring to resolve the blocking phenomenon of a receive buffer in high-speed message transmission. Under a group communication environment, it saves the time required to retransmit the lost packets by the communication software working in the upper layer of the message source station, while the destination station is the data collector of the other stations and is overloaded.

A high-speed double loop network with buffer insertion access scheme for supporting multi-media communication services

A double loop network based on the topological strategy of forward loop backward hop designed to support a large volume of information exchange is presented. The double loop network has two particular characteristics in bandwidth requirement and congestion avoidance since each network node is attached with extra links. The medium access scheme of the double loop network is implemented by a buffer insertion access protocol. The performance analysis and simulation have been carried out using the multi-media communication services traffic model. The performance characteristics of the high throughput rate and low and bounded delay are shown in the analytical and simulative results.

The FTCSMA/CD network

This paper presents a new network model, FTCSMA/CD to provide fault-tolerant capability on IEEE 802.3 (CSMA/CD). This model inserts a sublayer between the LLC (logical link control) sublayer and MAC (medium access control) sublayer, in order to provide the fault tolerance function. That insertion sublayer is called ILM (Interface between LLC and MAC). The new network model adopts two channels as the communication path, but only one channel is permitted to work at a time. Though the network bandwidth of this network model is not expanded, the network model still reached the goal of network fault tolerance. Further, the network model design is based on compatibility with the existent ethernet, so that the original software in the existent network could be used in the fault-tolerant model.

An easy implementation of multimedia synchronization on a high-speed ring LAN

Synchronization of multimedia services is a problem when two or more real-time applications are applied on an integrated local area network. A simple technique of synchronizing two kinds of real-time packets into a high-speed multimedia LAN is proposed and described in this paper. The basic structure of the multimedia LAN is a modified buffer-insertion ring network. Its transmission bandwidth is up to 512 Mbits/sec. A high-speed network interface which contains a special mechanism is attached onto this network. The special mechanism includes video controller, voice controller and an integrated interface unit which determine the transmission of video and voice packets. The system guarantees that a real-time packets transmission delay will fall into an acceptable range.

An integrated service environment applied on modified double token-ring network

There are several protocols which have been proposed to meet the requirements of an integrated service. The authors propose a modified double token-ring network protocol to increase the effect on an integrated service environment. The new protocol has two modes: (1) normal mode (N mode). (2) video-audio mode (V-A mode). The normal mode is like a general double token-ring network that is suited for sending original date. The video-audio mode is a new method. In this mode, video and audio can be sent to each other by two links efficiently. A management node will allocate N mode or V-A mode by an efficient algorithm. They also propose a method to recover the network if a link is broken in V-A mode.<<ETX>>

Analyze gain of distributed multichannel manufacturing automation protocol network

The DMMAP (distributed multichannel manufacturing automation protocol) network is a high speed local area network. It is fully compatible with the token-passing bus network. There are two problems in DMMAP. The first is how to manage many simultaneously received tokens, and the second is how to decide which medium access control (MAC) frame should be transmitted first, to make the system function smoothly. The authors solved these problems by extending the length of response window and keeping the token for the highest priority data. They found that the extended bandwidth is not proportional to the channel number. The reason of this phenomenon is that the overhead of the response window is proportional to increased channel number, so the curve of service time versus channel number of DMMAP is a parabola. They analyzed this phenomenon and give the formula of the gain of DMMAP compared with manufacturing automation protocol (MAP), and the upper bound and lower bound of response window size.<<ETX>>