"Tiers" in the telecommunication global tends to have treble definitions, depending on who you ask. What level a bandwidth mover is, is slackly defined at superior and every person has their own belief of what grade a traveller can 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 system in which individual outpost do away with peers and regulars are maintained. The exchange cards function pays for none of it's theodolite.
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Tier-1 is the optimal framework mainstay for medium to roomy businesses next to judgmental reliability, stability, and quantifiability requirements.
Tier-1 can be an asset when it comes to handling DDoS attacks: if you ask/configure your Tier-1 supplier to null-route an IP they will instrumentation the null-route at their borders, so nearby is no factor of pervasion.
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 united near Broadwing)
NTT Communications
Tier-2: [may be well thought out a CLEC (Competitive Local Exchange Carrier); has their own network, but likewise resells level 1]
Tier-2 is where on earth the network operator buys all or quite a few of it's theodolite from a Tier-1 and resells it.
Tier-2 can be an dominance if you involve human to award power bandwidth, and peculiarly if your involve is a one-member set site. If you buy from Tier-1 #1 in New York, and #1 has a eccentricity near its Tier-1 #2 peering skilled worker in New York, past all your aggregation from you to #2 may be wonder-struck. Your potential to bawl at #1 and get them to fix it will be limited, especially if the breakdown is with #2's line trained worker. A satisfactory Tier-2 will monitor its upstreams and their peering points for trouble, and thieve measures to insure that it doesn't feeling their regulars. Even if you status multi-location installs, purchasing from a upright Tier-2 can be multipurpose.
A Tier-2 that solely responds to tough snags (e.g. unqualified indefinite quantity of an upstream nexus) is no much effectual than a Tier-1 to person who has multi-locations.
Pricing from Tier-2 ISPs is habitually cheaper at the low-end (e.g. T1). Tier-2's will repeatedly rout the tier-1's in valuation "access services". But if you buy in the hundreds of megabits, a Tier-2 is liable to quotation overmuch superior than a Tier-1.
Tier-2's are consistently lesser companies, and are better-quality able to "make deals", or make out courting of contracts, dash off custom SLAs (Service Level Agreements), trench fibre to your location in trade off for that signed contract, etc. Unless you buy triplex gigabits from your upstreams, if you poorness to push contracts beside Tier-1s, you will belike end-up doing it finished a wholesaler or other purchasing machinery.
Examples of US Tier-2 carriers:
XO Communications
Covad
Paetec/US LEC
Time Warner Telecom (recently merged next to 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 clients of Tier-2's. Tier-3 may tender you what looks approaching a suitable fee.....but longterm reliability, performance, and quantifiability will probable experience. For chunk of brain for your concern a Tier-1 or Tier-2 are advanced choices is virtually every legal proceeding. However, PowerNet Global is a big freedom to this guiding principle due to their not clear structure and interaction beside principal players.
Examples of US Tier-3 carriers:
Trinsic
Excel
Primus Telecom
PowerNet Global
Access One Inc.
Splice Communications
Acceris
Whatever firm standing you want met be assured to regard what grade your ready bandwidth providers are in your purchasing judgment. Ignoring this factor in your deliberations may repercussion in smaller quantity than optimum implementation and pleasure in the end. Make a nifty enterprise conclusion.....leave goose egg to prospect.
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