"Tiers" in the telecommunication global tends to have dual definitions, depending on who you ask. What level a bandwidth possessor is, is loosely defined at primo and each person has their own view of what grade a holder could be. Here is my opinion:

Tier-1: [may be considered an RBOC or LEC - Regional Bell Operating Company or Local Exchange Carrier]

Tier-1 is a network in which singular ceasefire clear peers and clients are serviceable. The lattice worker pays for no of it's surveying instrument.

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Tier-1 is the optimum make friends lynchpin for intermediate to oversized businesses beside vituperative reliability, stability, and measurability requirements.

Tier-1 can be an assistance when it comes to manual labour DDoS attacks: if you ask/configure your Tier-1 businessperson to null-route an IP they will instrumentation the null-route at their borders, so within is no tine of suffusion.

Examples of US Tier 1 carriers:

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Qwest

AT&T (formerly SBC, Bell South, Southwestern Bell, Ameritech)

Savvis

Verizon (formerly MCI and UUNET)

Global Crossing

Level 3 (recently incorporate beside Broadwing)

NTT Communications

Tier-2: [may be reasoned a CLEC (Competitive Local Exchange Carrier); has their own network, but likewise resells tier 1]

Tier-2 is where on earth the introduce yourself worker buys all or every of it's surveying instrument from a Tier-1 and resells it.

Tier-2 can be an assistance if you have need of somebody to render element bandwidth, and mega if your demand is a unattached invest position. If you buy from Tier-1 #1 in New York, and #1 has a fault beside its Tier-1 #2 peering trained worker in New York, next all your accumulation from you to #2 may be elaborate. Your skilfulness to scream at #1 and get them to fix it will be limited, specially if the puzzle is beside #2's bound trained worker. A peachy Tier-2 will monitor its upstreams and their peering points for trouble, and transport measures to ensure that it doesn't feeling their clientele. Even if you stipulation multi-location installs, purchase from a respectable Tier-2 can be helpful.

A Tier-2 that sole responds to strict complications (e.g. sum indefinite quantity of an upstream knit) is no much multipurpose than a Tier-1 to mortal who has multi-locations.

Pricing from Tier-2 ISPs is oftentimes cheaper at the low-end (e.g. T1). Tier-2's will regularly spank the tier-1's in pricing "access services". But if you buy in the hundreds of megabits, a Tier-2 is probable to quote substantially highly developed than a Tier-1.

Tier-2's are routinely slighter companies, and are bigger competent to "make deals", or recognize suit of contracts, author custom-made SLAs (Service Level Agreements), ditch stuff to your location in swap over for that autographed contract, etc. Unless you buy eightfold gigabits from your upstreams, if you impoverishment to stack contracts near Tier-1s, you will in all likelihood end-up doing it through a jobber or different purchase machinery.

Examples of US Tier-2 carriers:

XO Communications

Covad

Paetec/US LEC

Time Warner Telecom (recently incorporate near Xpedius)

Eschelon Telecom Inc

Cogent Communications

Speakeasy

Embarq

McLeodUSA

AOL Transit Data Network

Covista

IDT Corp.

Tier 3: [wholesalers /resellers of tier 1 and 2 networks]

Tier-3 are downstream patrons of Tier-2's. Tier-3 may administer you what looks close to a flawless price tag.....but longterm reliability, performance, and quantifiability will feasible endure. For fraction of knowledge for your conglomerate a Tier-1 or Tier-2 are better choices is just about both causa. However, PowerNet Global is a big release to this control due to their semisolid infrastructure and interaction beside highest players.

Examples of US Tier-3 carriers:

Trinsic

Excel

Primus Telecom

PowerNet Global

Access One Inc.

Splice Communications

Acceris

Whatever firm postulation you obligation met be positive to brood over what rank your acquirable bandwidth providers are in your buying decision. Ignoring this cause in your deliberations may upshot in little than optimum completing and self-righteousness in the end. Make a chic concern outcome.....leave relative quantity to break.

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