Belyi's theorem: Difference between revisions

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== Description ==
The '''Physical Coding Sublayer''' (PCS) further helps to define physical layer specifications (speed and Duplex modes, etc.) for networking protocols like [[Fast Ethernet]], [[Gigabit Ethernet]] and [[10 Gigabit Ethernet]].
 
The Ethernet PCS is part of the Ethernet PHY layer. The hierarchy is as follows:
 
* [[Data Link Layer]] (Layer 2)
** LLC ([[Logical Link Control]] Sublayer)
** MAC ([[Media Access Control]] Sublayer)
*** RS (Reconciliation Sublayer) - This sublayer processes PHY Local/Remote Fault messages and handles DDR conversion
* [[physical layer | PHY Layer]] (Layer 1)
** PCS (Physical Coding Sublayer) - This sublayer performs [[autonegotiation]] and coding such as [[8b/10b encoding]]
** PMA (Physical Medium Attachment Sublayer) - This sublayer performs PMA framing, octet synchronization/detection, and <math>x^7+x^6+1</math> scrambling/descrambling
** PMD ([[Physical Medium Dependent]] Sublayer) - This sublayer consists of a transceiver for the physical medium
 
== Physical Coding Sublayer (PCS) specifications ==
 
===10 Gigabit Ethernet===
 
*10GBASE-R (LAN) is the serial encoded PCS that allows for Ethernet framing at a rate of approximately 10.3 Gbit/s (MAC = 10,000  Gbit/s, overhead = 64 B/66 B effective rate = 10,000 * 66/64 = 10,312.5 - see also [[64b/66b encoding]]). This rate does not match the rate 9.953 Gbit/s used in [[SONET]] and SDH and is not supported over a WAN based on SONET or SDH.
*10GBASE-X (LAN) uses similar coding methods as 10GBASE-R but is only used in the definition of 10GBASE-LX4. This is mainly because LX4 operates on both single and multimode fibers, giving it a unique set of specifications as defined in its [[Physical Media Dependent|PMD]].
*10GBASE-W (WAN) defines WAN encoding for 10GbE, it encodes the frames so that they are compatible with SONET STS-192c data rates and SDH VC-4-64 transmission standards allowing for 10 Gbit/s transmission across a WAN. It does this by wrapping the 64/66b payload into a SONET frame, making the effective rate 9.95 Gbit/s.
 
=== Lattice Semiconductor multi-protocol ===
 
"PCS logic can be configured to support numerous industry-standard, high-speed serial data transfer protocols."{{cite journal|title=LatticeECP3 SERDES/PCS Usage Guide|journal=Lattice semiconductor Corporation|pages=p 8–1|url=http://www.latticesemi.com/documents/tn1176.pdf}}
Link is dead
 
== References ==
 
{{cite journal|last=Barbieri|first=Alessandro|title=10 GbE and Its X Factors|journal=Packet: Cisco Systems Users Magazine|volume=17|issue=3|pages=25–28|url=http://www.cisco.com/asiapac/campaigns/metroethernet/files/10ge_po_pack_mag_arti.pdf|accessdate=2007-12-31}}
 
== External links ==
* [http://grouper.ieee.org/groups/802/3/ae/public/mar00/figueira_1_0300.pdf IEEE 802.3 Meeting]
* [http://www.xilinx.com/systemio/1gbsx_phy/basics.htm Ethernet 1000BASE-X PCS/PMA Technology Basics]
 
[[Category:Networking standards]]
{{compu-network-stub}}

Latest revision as of 09:26, 16 October 2013

Description

The Physical Coding Sublayer (PCS) further helps to define physical layer specifications (speed and Duplex modes, etc.) for networking protocols like Fast Ethernet, Gigabit Ethernet and 10 Gigabit Ethernet.

The Ethernet PCS is part of the Ethernet PHY layer. The hierarchy is as follows:

Physical Coding Sublayer (PCS) specifications

10 Gigabit Ethernet

  • 10GBASE-R (LAN) is the serial encoded PCS that allows for Ethernet framing at a rate of approximately 10.3 Gbit/s (MAC = 10,000 Gbit/s, overhead = 64 B/66 B effective rate = 10,000 * 66/64 = 10,312.5 - see also 64b/66b encoding). This rate does not match the rate 9.953 Gbit/s used in SONET and SDH and is not supported over a WAN based on SONET or SDH.
  • 10GBASE-X (LAN) uses similar coding methods as 10GBASE-R but is only used in the definition of 10GBASE-LX4. This is mainly because LX4 operates on both single and multimode fibers, giving it a unique set of specifications as defined in its PMD.
  • 10GBASE-W (WAN) defines WAN encoding for 10GbE, it encodes the frames so that they are compatible with SONET STS-192c data rates and SDH VC-4-64 transmission standards allowing for 10 Gbit/s transmission across a WAN. It does this by wrapping the 64/66b payload into a SONET frame, making the effective rate 9.95 Gbit/s.

Lattice Semiconductor multi-protocol

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The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

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References

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In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

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