EM-CRMA-II: a high-performance media access protocol for ring wavelength division multiplex (WDM) networks

1995 ◽  
Author(s):  
Guoping Zhang ◽  
Jadwiga Indulska
Keyword(s):  
High Performance ◽  
Wavelength Division Multiplex ◽  
Wdm Networks ◽  
Media Access ◽  
Access Protocol ◽  
Wavelength Division

A Media Access Control Protocol for Broadcast Type Super High-Speed WDM Networks

2003 ◽  
Vol 04 (02) ◽  
pp. 147-162
Author(s):  
Akio Koyama ◽  
Masato Akiyama
Keyword(s):  
New Media ◽  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Wdm Networks ◽  
Media Access Control ◽  
Media Access ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Long Time ◽  
Control Packets

In this paper, we propose a new media access protocol for single hop Wavelength Division Multiplexing (WDM) networks with a passive star topology. In the conventional protocols, when the control packets collided with other ones or the packets didn't get a data channel from the channel reservation mechanism, these packets should be retransmitted. But, when transmission distance becomes long, it takes a long time to transmit the control packets and the propogation dalay time will be long. We propose a new protocol that can allocate data channels without retransmitting control packets except the collided ones. By using the proposed protocol, it is possible to reduce the transmission delay time and to get high throughput because the number of retransmitted control packets is reduced. The simulation results show that the proposed protocol has good performance comparied with conventional protocols.

Dynamic Traffic Grooming under a Differentiated Resilience Scheme for WDM Mesh Networks

2011 ◽  
pp. 181-194
Author(s):  
Taisir E.H. El-Gorashi ◽  
Jaafar Elmirghani
Keyword(s):  
Optical Fibre ◽  
Level Scheme ◽  
Mesh Networks ◽  
Traffic Grooming ◽  
Wdm Networks ◽  
Bandwidth Efficiency ◽  
Dynamic Traffic ◽  
Wavelength Division ◽  
Telecommunications Services ◽  
Dynamic Traffic Grooming

Due to its huge bandwidth, optical fibre is currently widely deployed to provide a variety of telecommunications services and applications. Wavelength-division multiplexing (WDM) has emerged as the technology of choice to harness the huge bandwidth available in an optical fibre. Traffic grooming supports efficient utilization of network resources by allowing sub-wavelength granularity connections to be groomed onto a single lightpath. Fault-tolerance for WDM networks is a major architectural and design issue as a single link failure can cause loss of an enormous amount of information. However, providing 100% guaranteed resilience to all types of traffic supported by existing and future networks may be unnecessary and wasteful in terms of resource utilization and cost efficiency. This chapter investigates the problem of dynamic traffic grooming for WDM networks under a differentiated resilience scheme. We propose two differentiated resilience schemes at different grooming levels— Differentiated Resilience at Lightpath (DRAL) level scheme, and Differentiated Resilience at Connection (DRAC) level scheme. These schemes explore different ways of provisioning backup paths and tradeoff between bandwidth efficiency and the number of required grooming ports. Both schemes support three resilience classes: dedicated protection, shared protection, and restoration. Simulation is carried out to evaluate and compare the two differentiated resilience schemes. Simulation results show that the DRAL scheme is not very sensitive to the changes in the number of grooming ports, while the DRAC scheme utilizes grooming ports more aggressively as it trades grooming ports for bandwidth efficiency in routing and grooming.

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