摘要:

AbstractIn a network based on the asynchronous transfer mode (ATM), quality of service requirements have to be met even in the presence of users who send traffic as bursty as the policing device allows. For peak cell rate policing with a jitter tolerant leaky bucket, a periodic maximally bursty traffic pattern allowed by the leaky bucket is derived. The impact of this kind of bursty user traffic on the cell loss performance of the remaining sources is investigated by introducing, solving and applying the queueing model Geo(n) +P/D/1/K, wherePstands for ‘periodic’. Taking bursty user traffic into account, it is shown that the maximal jitter or cell delay variation allocated to the user and tolerated by the leaky bucket is an important parameter for link utilization. The results help to answer the question under which conditions a shaping function is needed in conjunction with the usage parameter control funct

ISSN:1074-5351    

DOI:10.1002/dac.4500070302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractBecause of the introduction of SDH based networks, the exigence of performing stability measurements on timing signals is becoming more and more stringent. In this paper, the influence of the measurement sampling period on the behaviour of the stability quantities is analysed and useful information for specification design and assessment purposes are provided.

ISSN:1074-5351    

DOI:10.1002/dac.4500070303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThe concept of the equivalent bandwidth of a source seems highly attractive for characterizing ATM traffic sources as it can be used to treat constant as well as variable bit rate sources within a common framework. In this paper we review the concept of equivalent bandwidth based on asymptotic results and study the performance of a few admission criteria which use this concept in one way or another. A major finding is that with appropriate refinements to account for the possible statistical multiplexing gain at small to moderate buffer sizes, the well‐known conservatism of the asymptotic equivalent bandwidth based criteria can be overcome. We also discuss how these criteria would perform in practical situations where the traffic sources are incompletely characterized, or where they are specified in terms of leaky‐bucket based traffic descript

ISSN:1074-5351    

DOI:10.1002/dac.4500070304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper describes a performance analysis of the IEEE 802.6 distributed queue dual bus (DQDB) metropolitan area network (MAN) protocol based on computer simulation. The MAN is a new broadband communications network that is designed to support both constant and variable bit rate applications. An overview of the important fast packet technologies and the position of the DQDB MAN is explained before the performance evaluation is carried out. The network is intended to offer high data rates and throughputs for users. The main use will be to interconnect remote LANs within a city and provide LAN‐like performance with respect to delays. The analysis given here begins with a description of the MAN and the operation of the DQDB protocol. A state description is derived and expanded upon. The use of the simulation package OPNET is described and its use in modelling DQDB is explained. The method of modelling using OPNET via an extended state description is given. A model giving the full simplified functional operation of a DQDB node is arrived at and the basic model is used to analyse a fifty‐node network under varying traffic conditions; underload, overload, varied traffic mix, etc. The unfairness characteristic of the protocol is demonstrated and the conclusions drawn are that the DQDB MAN provides a fast data transport network up to very high loadi

ISSN:1074-5351    

DOI:10.1002/dac.4500070305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper proposes a high‐speed ATM switch architecture for handling cell rates of several Gb/s in a broadband communication switching system or cross‐connect system. The proposed switch architecture, named the high‐speed‐retry banyan switch, employs a bufferless banyan network between input and output buffers; a cell is repeatedly transmitted from an input buffer until it can be successfully transmitted to the desired output buffer. A simple cell‐retransmission algorithm, is employed as is a ring‐arbitration algorithm for cell conflict. They are suitable for FIFO type buffers and bufferless highspeed devices. Good traffic characteristics which are independent of switch size are achieved for an internal speed ratio of only four times the input line speed. A prototype system with the internal speed of 1·2 Gb/s is constructed in order to confirm the basic operation of the high‐speed‐retry banyan switch. The prototype system, even in its present state, could be used to realize a giga‐bit‐rate BI

ISSN:1074-5351    

DOI:10.1002/dac.4500070306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractIn this paper, we examine design issues relevant to the implementation of a data link layer of a home automation system based on the Electronics Industries Association (EIA) Consumer Electronics Bus (CEBus). The hardware and software components of the system are described along with several techniques that enhance the performance of the system, allow for a faster implementation using off‐the‐shelf components and provide low overhead. The proposed design has been incorporated into a basic home automation system (BHAS) that is used as a testbed for alternative technologies and algorit

ISSN:1074-5351    

DOI:10.1002/dac.4500070307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper presents a new protocol for token ring local computer networks and its performance for single and dual ring networks using simulation modelling. The proposed protocol is a modification of the IEEE 802·5 token ring standard. In this protocol, a station can start transmission if it receives a free token or a data packet passing its interface logic. Idle stations are skipped whenever there is at least one station that has a ready packet to transmit. This is achieved by using two of the reserved bits in the frame status (FS) field. The bits used are called transmission reservation bits (TR‐bits). The TR‐bits are reset by the sending station and set by the first station that has data to transmit during the round trip of the associated packet along the ring. It is found that the proposed modified token ring (MTR) protocol provides better throughput and delay performance for both the single and dual ring networks. The reduction in mean delay of the MTR as compared to the standard token ring (STR) reaches about 45 per cent under heavy traffic conditions. Moreover, it is found that the performance of the MTR decreases as the packet size increases but remains higher than the corresponding performance of the STR for both the single and dual ring networks. The MTR provides a maximum throughput improvement of about 6 per cent over the STR for both dual and single ring cases. Finally, the proposed protocol (MTR) is easy to implement, with no extra hardware and has low cost/performance characteris

ISSN:1074-5351    

DOI:10.1002/dac.4500070308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:1074-5351    

DOI:10.1002/dac.4500070309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:1074-5351    

DOI:10.1002/dac.4500070301

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY