24 November 1995 Adaptive MAC-layer protocol for multiservice digital access via tree and branch communication networks
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Proceedings Volume 2609, Hybrid Fiber-Coax Systems; (1995) https://doi.org/10.1117/12.227278
Event: Photonics East '95, 1995, Philadelphia, PA, United States
Described here is an adaptive MAC-layer protocol that supports multiservice (STM and ATM) applications in the context of subscriber access to tree and branch (e.g., fiber-coaxial cable) networks. The protocol adapts to changing demands for a mix of circuit and cell mode applications, and efficiently allocates upstream and downstream bandwidth to a variety of bursty and isochronous traffic sources. In the case of a hybrid fiber-coaxial (HFC) network the protocol resides in customer premises equipment and a common head-end controller. A medium-access control (MAC) processor provides for dividing the time domain for a given digital bitstream into successive frames, each with multiple STM and ATM time slots. Within the STM region of a frame, variable length time slots are allocated to calls (e.g., telephony, video telephony) requiring different amounts of bandwidth. A contention access signaling channel is also provided in this region for call control and set-up requests. Within the ATM region fixed-length time slots accommodate one individual ATM cell. These ATM time slots may be reserved for a user for the duration of a call or burst of successive ATM cells, or shared via a contention process. At least one contention time slot is available for signaling messages related to ATM call control and set-up requests. Further, the fixed-length ATM time slots may be reserved by a user for the duration of a call, or shared through a contention process. This paper describes the MAC-layer protocol, its relation to circuit- and ATM- amenable applications, and its performance with respect to signaling throughput and latency, and bandwidth efficiency for several service scenarios.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sriram Kotikalapudi, Sriram Kotikalapudi, Chia-Chang Li, Chia-Chang Li, Peter D. Magill, Peter D. Magill, Norman A. Whitaker, Norman A. Whitaker, James E. Dail, James E. Dail, Miguel A. Dajer, Miguel A. Dajer, Curtis A. Siller, Curtis A. Siller, } "Adaptive MAC-layer protocol for multiservice digital access via tree and branch communication networks", Proc. SPIE 2609, Hybrid Fiber-Coax Systems, (24 November 1995); doi: 10.1117/12.227278; https://doi.org/10.1117/12.227278


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