The Demand Priority MAC protocol

Watson, Greg; Albrecht, A.; Curcio, J.; Dove, D.; Goody, S.; Grinham, J.; Spratt, M.; Thaler, Patricia

doi:10.1109/65.372617

Cited by 20 publications

(3 citation statements)

References 4 publications

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“…The emerging IEEE 802.12 standard [5], [29] is another effort to provide guaranteed bandwidth and bounded access delay for time-critical applications by using existing 10Base-T networks. Since it does not reserve network resources according to the need of each node dynamically, it still suffers the second problem mentioned above.…”

Section: Hard Real-time Channels On Multiaccess Linksmentioning

confidence: 99%

Statistical real-time channels on multiaccess bus networks

Chou

Shin

1997

IEEE Trans. Parallel Distrib. Syst.

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Abstract-Real-time communication with performance guarantees is expected to become an important and necessary feature of future computer networks. In this paper, we present a scheme which can provide real-time communication services with both absolute and statistical performance guarantees on multiaccess bus networks for given input traffic characteristics and performance requirements. The proposed scheme reserves network bandwidth for real-time connections according to their needs. It also allows for independent addition and deletion of real-time connections while preserving existing guarantees. Our extensive simulation results for motion video communication have shown the proposed scheme to outperform the other well-known schemes.

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Section: Hard Real-time Channels On Multiaccess Linksmentioning

confidence: 99%

Statistical real-time channels on multiaccess bus networks

Chou

Shin

1997

IEEE Trans. Parallel Distrib. Syst.

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“…A proposal that almost, but not entirely, retained the original Medium Access Control (MAC) protocol was standardised in IEEE 802.3u in 1995 and marketed as Fast Ethernet. Also in 1995, an alternative proposal using the new Demand Priority MAC protocol [1] was standardised in IEEE 802.12 [2] and marketed as 100VGAny-LAN [3]. Although Fast Ethernet ultimately prevailed over 100VG-AnyLAN in the marketplace, both technologies were responsible for the sale of millions of network devices: in 1995 alone, Fast Ethernet accounted for 665,000 adapter sales while 100VG-AnyLAN accounted for 218,000 (reported in [4], quoting market research from IDC).…”

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confidence: 99%

The Design of the IEEE 802.12 Coding Scheme

Crouch

Davis

Jedwab

2007

IEEE Trans. Commun.

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In 1995 the IEEE approved the 802.12 standard for data transmission at 100-Mbit/s using the Demand Priority network access protocol. 100VG-AnyLAN products conforming to this standard offered an upgrade path for Ethernet and Token Ring networks, without requiring new building wiring. A key factor in the approval of the 802.12 standard was the demonstrated error detection properties of its coding scheme. In particular, the coding scheme allows the detection of error bursts affecting encoded data carried on four parallel conductors, using nothing more than the standard IEEE 32-bit cyclic redundancy check applied to the unencoded data. Although these error detection properties were presented for verification as part of the standards process, for many years commercial considerations prevented public disclosure of how the code was actually found. These considerations no longer apply, and in this paper we explain in detail the design principles of the code, combining geometrical insight, linear algebra, combinatorial reasoning, and computer search.

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“…More recently, Hewlett-Packard developed a Demand Priority Access protocol [12] which is now the IEEE 802.12 standard. It is called 100VG-AnyLAN [2] and is designed to provide users with guaranteed bandwidth and low latency.…”

Section: Related Workmentioning

confidence: 99%

EtheReal: a host-transparent real-time Fast Ethernet switch

Varadarajan

Chiueh²

Proceedings Sixth International Conference on Network Protocols (Cat. No.98TB100256)

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Distributed multimedia applications require guaranteed quality of service (QoS) from the underlying networks. Most of the QoS research is focused on networks consisting of Layer-3 routers or ATM switches. Relatively little attention is given to the QoS support on existing local area networks, in particular Ethernet, which essentially forms the last mile of the end-to-end network bandwidth guarantee solution. This paper describes the design, implementation, and evaluation of a real-time Fast Ethernet switch calledEtheReal that provides bandwidth guarantees to real-time applications running on Ethernet without modification to the hardware and operating system on the host machines. At the heart of the EtheReal switch architecture is a novel realtime connection setup protocol that is completely transparent to the host machine's OS, and thus allows the switch to be deployed in a network of heterogeneous machines running different OS platforms. The only dependency of EtheReal on the hosts is their support for TCP/UDP/IP. In addition, the EtheReal switch uses an Ethernet address swapping technique for real-time packets, similar to ATM to avoid the complexity of maintaining a global connection ID space. Because of the inherent CRC support built into Ethernet hardware, this technique significantly reduces the total processing overhead compared to address swapping at higher network layers. The current EtheReal switch prototype is fully operational, and is built with off-the-shelf PC hardware. It is capable of supporting up to 640 Mbits/sec across 4 ports, and has a per-hop connection establishment overhead of 0.1-0.6 msec and a 10 s non-real-time packet latency.

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The Demand Priority MAC protocol

Cited by 20 publications

References 4 publications

Statistical real-time channels on multiaccess bus networks

Statistical real-time channels on multiaccess bus networks

The Design of the IEEE 802.12 Coding Scheme

EtheReal: a host-transparent real-time Fast Ethernet switch

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