Extensibility and limitations of FDDI

Recently two standards for Metropolitan Area Networks (MANs), Fiber Distributed Data Interface (FDDI) and Distributed Queue Dual Bus (DQDB), have emerged as the primary competitors for the MAN arena. Great interest exists in building higher speed networks which support large numbers of node and greater distance, and it is not clear what types of protocols are needed for this type of environment. There is some question as to whether or not these MAN standards can be extended to such environments. The extensibility of FDDI to the Gbps range and a long distance environment is investigated. Specification parameters which affect performance are shown and a measure is provided for predicting utilization of FDDI. A comparison of FDDI at 100 Mbps and 1 Gbps is presented. Some specific problems with FDDI are addressed and modifications which improve the viability of FDDI in such high speed networks are investigated

Performance of gigabit FDDI

Great interest exists in developing high speed protocols which will be able to support data rates at gigabit speeds. Hardware currently exists which can experimentally transmit at data rates exceeding a gigabit per second, but it is not clear as to what types of protocols will provide the best performance. One possibility is to examine current protocols and their extensibility to these speeds. Scaling of Fiber Distributed Data Interface (FDDI) to gigabit speeds is studied. More specifically, delay statistics are included to provide insight as to which parameters (network length, packet length or number of nodes) have the greatest effect on performance

Diadromous Fish Investigations, 2016: Anadromous Alosid Restoration and Evaluation

Eight fishways on six New Hampshire (NH) coastal rivers were operated during the spring of 2016 to facilitate the passage of river herring (Alewife Alosa pseudoharengus and Blueback Herring Alosa aestivalis), American Shad Alosa sapidissima, and other diadromous fish over dams. Estimated numbers of river herring using all coastal river fish ladders in 2016 increased by approximately 40.5% from 2015. Alewives dominated returns to the Cocheco, Exeter, and Lamprey rivers while the Oyster River had a slightly higher percentage of Blueback Herring returning. The Oyster River continues to have low return numbers and exhibits signs that habitat problems are inhibiting restoration efforts. The Winnicut River fishway is ineffective at passing river herring and an investigation to determine a solution is ongoing. In the absence of restoration efforts, no American Shad returned to NH fishways in 2016. In an effort to enhance local spawning stocks, thousands of river F-61-RI-1_16_AR Page 2 herring were transferred from the Cocheco and Lamprey rivers to the Merrimack River drainage to assist in anadromous fish restoration efforts. In 2016, 2,250 river herring were stocked in impoundments or lakes within the Great Bay Estuary drainage. The NH Fish and Game Department has continued to work with state and federal agencies and non-governmental organizations on various cooperative diadromous fish passage projects on coastal NH rivers

The prospects for local government independence are bleakdue to the centre’s unwillingness to give up power

In the wake of the Scottish independence referendum, devolution of power has become the political discussion de jour. Although most discussion has focussed on the relationship between Scotland and the rest of the UK, or on the regions, local government is still an important component of the debate. Recently, the Labour MP Graham Allen proposed legislation that would provide legal independence to local government. Chris Game runs the rule over the legislation, and argues that the prospects for its future passage are slim

Anadromous Fish Investigations, Year 2005

Seven department fish ladders on six coastal rivers were operated during the spring of 2005 to facilitate the passage of river herring, American shad, and other diadromous fish over dams. Estimated numbers of river herring monitored in 2005 were lower than in 2004 in all six rivers. This may be attributed to high flows in all monitored rivers during the river herring run. Record low returns at the Exeter and Taylor river ladders are of concern. Possible causes of low return numbers in the Exeter are low dissolved oxygen levels in the river, impediments to downstream migration, excessive harvest by the in-river fishery, or a combination of the three. Alewives constituted 100% of the returns in the Lamprey and Exeter rivers and dominated returns in the Cocheco and Winnicut rivers. River herring returns in the Oyster and Taylor rivers were exclusively blueback herring. Confirmed returns of shad to the fishways were 12 in the Lamprey, three in the Exeter, and eight in the Cocheco rivers. The number of returns to the Exeter River decreased from 22 in 2004 to three in 2005. It is speculated that the reduction in returns could be due to water quality problems in the impoundment above the dam or incidental mortality in the in-river fishery for river herring. Biological samples indicated that ages ranged from III to VII and the ratio of males to females was three to one. In a concerted effort between New Hampshire Fish and Game and the U.S. Fish and Wildlife Service (USFWS), approximately 3,200 river herring were transferred into impoundments or lakes in the Great Bay Estuary drainage to enhance spawning stocks. No American shad were stocked this year as low numbers at the Merrimack River fish lift prevented collection of gravid adults. In addition, other collaborative efforts to restore anadromous fish to NH coastal rivers include dam removal or fish passage projects on three rivers within the Great Bay system. The first dam located at the head-of-tide on the Bellamy River was removed in 2004 to provide access to additional spawning and rearing habitat for species such as river herring and rainbow smelt. A feasibility study has recently been completed on fish passage options for the Winnicut River dam with dam removal and installation of a technical fishway at the next upstream barrier being chosen as the preferred option. Finally, a nature-like fishway has been selected as the preferred option for fish passage at Wiswall Dam on the Lamprey River and an Environmental Assessment for this project has been developed and approved

Electoral Quotas: Should the UK learn from the rest of the world?

UK Prime Minister Gordon Brown would surely love his political legacy to include a significant contribution to constitutional reform. Certainly he inherited, on succeeding Tony Blair in 2007, a substantial agenda of unfinished constitutional business: devolution, House of Lords reform, the electoral system, a bill of rights, a written constitution. Two years on, though, major progress on any of these ‘big’ topics seems most unlikely before a probable 2010 General Election. Which might mean a rather modest constitutional legacy, based mainly on bringing some prerogative powers under MPs’ scrutiny and control, and, in other comparatively minor ways, boosting the role of Parliament. One such low profile, though not unimportant, initiative is Brown’s revival of the Speaker’s Conference, a constitutional device that many supposed had become extinct with the creation in 2000 of the Electoral Commission

Testing of Great Bay Oysters for Two Protozoan Pathogens

Two protozoan pathogens, Haplosporidium nelsoni (MSX) and Perkinsus marinus (Dermo) are known to be present in Great Bay oysters. With funds provided by the New Hampshire Estuaries Project (NHEP), the Marine Fisheries Division of New Hampshire Fish and Game Department, (NHF&G) has continued assessing the presence and intensity of both disease conditions in oysters from the major beds, some open for harvest, within the Great Bay estuarine system

Lenin's theory of imperialism and the internationalisation of capital

Thesis (M.A.) -- University of Adelaide, Dept. of Politics, 197