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Proceedings Paper

Simulation tool for traffic analysis of hybrid fiber-coax systems
Author(s): David J. Houck; Wai Sum Lai
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Paper Abstract

This paper provides a high-level overview of an object-oriented simulation tool developed to model the HFC-2000TM broadband access network of AT&T. One objective of this tool is to help estimate the traffic capacity of fiber nodes and to explore various alternatives in architecture and design. Another objective is to provide guidelines for the use of different time slot assignment algorithms and for capacity planning. To achieve these goals, salient operational and serving features of the HFC-2000TM have been incorporated into the tool. Specifically, the tool models the traffic and serving characteristics of an entire fiber node with multiple coaxes, each carrying traffic both upstream and downstream. To facilitate the evaluation of performance under different traffic scenarios, the simulator allows traffic characteristics to be specified on a per-port basis in terms of a large variety of service types. A finite-source quasi-random input process is used to model the call arrivals from the different ports, with each port being considered an independent traffic source. A mixture of lognormal distributions is used for the call holding time distributions of various call types. The traffic from any given port is characterized by a service profile which specifies the probabilities for the different call types to be generated by the port. The traffic loading offered by a given port is specified by the hourly CCS (hundred call seconds) for that port. The tool is built using the object-oriented feature of C++. Different objects are used to implement the various features of the different types of network interface units, upstream and downstream channels, and the various types of call events.

Paper Details

Date Published: 24 November 1995
PDF: 8 pages
Proc. SPIE 2609, Hybrid Fiber-Coax Systems, (24 November 1995); doi: 10.1117/12.227286
Show Author Affiliations
David J. Houck, AT&T Bell Labs. (United States)
Wai Sum Lai, AT&T Bell Labs. (United States)


Published in SPIE Proceedings Vol. 2609:
Hybrid Fiber-Coax Systems
Wai Sum Lai; Sam T. Jewell, Editor(s)

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