Internet Service
Dymin Dedicated Internet
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What Circuit is Right for You?
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T1 (full / fractional)A T1 is the standard bearer for reliable, fast and cost effective Internet connectivity for businesses in America. T1s provide a dependable 1.54 mbps of throughput, or 24 times the speed of a standard dial up connection. As the circuits are delivered over dedicated copper connections providing constant data throughput, both for upload and download, T1s are ideal for all aspects of business that depend on Internet Connectivity from e-mail access, web conferencing and e-commerce applications. T1s are considered to be the building blocks of business Internet Connectivity as they can be used by themselves, or bundled together to form multi-meg circuits. Their dependability and consistent data throughput (as opposed to DSL connections) make them ideal for the transit of both data applications as well as business class VoIP. T1s typically cost between $350 and $600 with the mean price being about $500. Prices are largely determined by the distance of the local loop (often referred to as the last mile), the distance from the customer's site to that of an Internet Gateway. Installation time frames range from 20 to 50 days and are coordinated between the Local Exchange Carrier (local loop) and the ISP (port). NxT1With the NxT1 Access option, the user can obtain bandwidth above 1.5 Mbps (T1) without requiring T3 access. NxT1 connects 2, 3 or 4 dedicated T1 circuits (3 Mbps, 4.5 Mbps or 6 Mbps, respectively). NxT1 Access is provided through a combination of software and hardware components, giving greater bandwidth by automatically load balancing traffic over multiple T1 links. Multilink PPP (MLPPP) is a method of splitting, recombining, and sequencing data across multiple logical data links. Large files are actually split into BITS and sent evenly down all T1s to the carrier's edge router in which they are placed back together in the same order. This is done instantaneously with no loss of bandwidth. It is important to understand that the carrier needs to use the same type of equipment and protocol on their end in order to recombine your data, and to split the data into packets coming to you in order to obtain the increased speed in both directions.
You can see within the example above that a virtual 4.5M pipe is created because of the MLPPP protocol. Absolutely no bandwidth is lost, and you will be able to move large files at the 4.5M specifications. DS-3 / T3To meet the ever expanding need of high end IP throughput for today's large enterprise, tier-one providers are rapidly expanding their DS-3 foot print making this carrier-grade Internet connection a viable option for more and more corporate buyers. A DS-3, also called a T3, is a dedicated circuit delivered by a Local Exchange Carrier (LEC) via traditional local copper networks and in some cases, over fiber. In its full rate form, a DS-3 has the same capacity of 28 T1s. Like a T1, a DS-3 can be channelized to deliver voice as well as data. When channelized for voice, a DS-3 can hold 672 individual 64 Kbps POTS lines. When connected to a tier-one carrier edge router however, it delivers a whopping 45 Mbps of Internet connectivity both in upload and download. While a DS-3 will always incorporate a full 45 Mbps access loop, a typical deployment of a DS-3 circuit rarely begins with a full rate port. Most corporations expanding beyond the limits of their T1 and NxT1 service opt to make the jump to fractional DS-3 such as 6 or 9 Mbps. Oftentimes, a 6 Mbps fractional DS-3 will be more expensive from a monthly recurring cost standpoint than simply bonding more T1s. Corporations who jump from a dual bonded T1 or higher NxT1 speed to a 6 Mbps DS-3 will typically incur a larger monthly price than that of just adding more T1s. The draw to DS-3 is found in its scalability properties. Upgrades are a matter of resizing the port which will rarely take more than a few days and growth to full 45 Mbps can occur at a pace the corporation is comfortable with. As users scale above 9 Mbps, the DS-3 begins to become the better priced option also as the cost of CPE required to implement large scale T1 bonding, along with lowering per megabit prices of the DS-3, begin to sway in the favor of the DS-3. Likely buyers of DS-3 service consist of enterprise size business with high data demands such as large scale VPN, video conferencing, and corporately hosted application servers. Software development firms will often require throughput above and beyond the capability of a T1 to handle client upload and download traffic as buyers log onto FTP servers to access patches and newer versions of their product. Hospitals and clinics who share a large number of electronic images such as MRI will require bit rates in excess of the 1544 Kbps available on a standard T1. Local and regional ISP themselves will use DS-3 circuits as the backbone of their consumer oriented broadband delivery and just about any user of tier-one, carrier grade bandwidth that has outgrown T1 and NxT1 options is a likely candidate for DS-3 service. OC-xService providers of broadband intensive services such as web hosting, DSL, WiMax, and unmetered dial-up with high subscriber rates find OCx as the final scale point for network growth. Optical Carrier (OC) circuits are provisioned via fiber networks and provide carrier-grade throughput speeds when terminated into a carrier network for bandwidth transit.
Since OCx service is all optical fiber, it ties into a carriers SONET infrastructure for completely redundant self-healing delivery. Providers advancing from copper based DS-3 networks will typically enjoy the price savings of built-in redundancy as well as the scalability of an optical fiber access loop. Typical providers of OCx transport service are the major global tier-one providers which include AT&T, Sprint, MCI, Qwest, Global Crossing, Broadwing, Level 3, and WilTel. While local exchange providers have the ability to offer OCx private line services that terminate to their network, it is rare that the circuit achieves full rate port speeds unless connected to the backbone of a provider such as these. Local Exchange Carrier (LEC) backbones are by nature tier-two and in any given POP, rarely connect to an upstream provider with more than the minimal OC multiple. Most tier-one carriers that offer OC level bandwidth transport serve buyers by establishing a commitment level of throughput, typically one-quarter of the port speed and base cost on this level. As more bandwidth is consumed, a rate established for overage is charged on a per/Mbps level. As OC users grow their subscriber base and use more bandwidth, they will have the ability to raise the minimum commitment and therefore re-negotiate their per/Mbps rate. Typical OCx agreements will be for a 12 month term with the option to renegotiate rates upon a higher commitment or increased port speed. |
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