"Tiers" in the telecom international tends to have septuple definitions, depending on who you ask. What level a bandwidth owner is, is slackly circumscribed at first-class and all and sundry has their own belief of what tier a mover strength be. Here is my opinion:

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

Tier-1 is a gridiron in which singular settlement loose peers and clients are serviceable. The network mathematical function pays for none of it's surveying instrument.

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Tier-1 is the optimal scheme keystone for surrounding substance to hulking businesses with hypercritical reliability, stability, and quantifiability requirements.

Tier-1 can be an vantage when it comes to handling DDoS attacks: if you ask/configure your Tier-1 supplier to null-route an IP they will implement the null-route at their borders, so at hand 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 incorporated with Broadwing)

NTT Communications

Tier-2: [may be thoughtful a CLEC (Competitive Local Exchange Carrier); has their own network, but as well resells level 1]

Tier-2 is wherever the meet people function buys all or numerous of it's surveyor's instrument from a Tier-1 and resells it.

Tier-2 can be an help if you condition somebody to make available feature bandwidth, and mega if your inevitability is a sui generis induct position. If you buy from Tier-1 #1 in New York, and #1 has a catch next to its Tier-1 #2 peering skilled worker in New York, then all your collection from you to #2 may be wonder-struck. Your cleverness to scream at #1 and get them to fix it will be limited, very if the breakdown is beside #2's casing skilled worker. A respectable Tier-2 will computer screen its upstreams and their peering points for trouble, and bear measures to ensure that it doesn't affect their regulars. Even if you entail multi-location installs, buying from a well-behaved Tier-2 can be neat.

A Tier-2 that solitary responds to strict hitches (e.g. whole indefinite quantity of an upstream connection) is no much neat than a Tier-1 to soul who has multi-locations.

Pricing from Tier-2 ISPs is commonly cheaper at the low-end (e.g. T1). Tier-2's will frequently tired the tier-1's in valuation "access services". But if you buy in the hundreds of megabits, a Tier-2 is feasible to inverted comma untold high than a Tier-1.

Tier-2's are conventionally smaller companies, and are larger competent to "make deals", or recognise courtship of contracts, jot tailor-made SLAs (Service Level Agreements), ditch fiber to your situation in swapping for that subscribed contract, etc. Unless you buy bigeminal gigabits from your upstreams, if you deprivation to accumulation contracts near Tier-1s, you will in all likelihood end-up doing it through with a wholesaler or other buying appliance.

Examples of US Tier-2 carriers:

XO Communications

Covad

Paetec/US LEC

Time Warner Telecom (recently merged near Xpedius)

Eschelon Telecom Inc

Cogent Communications

Speakeasy

Embarq

McLeodUSA

AOL Transit Data Network

Covista

IDT Corp.

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

Tier-3 are downstream clients of Tier-2's. Tier-3 may impart you what looks resembling a better price tag.....but longterm reliability, performance, and quantifiability will apt experience. For leaf of cognition for your concern a Tier-1 or Tier-2 are more choices is virtually all crust. However, PowerNet Global is a big release to this act due to their solidified road and rail network and contact near major players.

Examples of US Tier-3 carriers:

Trinsic

Excel

Primus Telecom

PowerNet Global

Access One Inc.

Splice Communications

Acceris

Whatever business request you condition met be positive to regard what rank your accessible bandwidth providers are in your purchase conclusion. Ignoring this cause in your deliberations may upshot in smaller amount than optimal completing and happiness in the end. Make a classy concern judgement.....leave nothing to luck.

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