Tier 1 network

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Tier 1 network

A top-level network on the Internet. There are 16 Tier 1 networks worldwide. In the U.S., AT&T, CenturyLink, GTT, Verizon and the Zayo Group are Tier 1. Germany, U.K, France, Hong Kong, Japan, India, Italy, Spain and Sweden host the non-U.S. networks.

Known as "settlement-free peering," Tier 1 networks are private networks that allow traffic from other Tier 1 networks to transit their backbones without a fee. See peering and IXP.

Tier 2 and Tier 3 Networks
Tier 2 networks peer with some networks without fees but pay to reach a large portion of the Internet. Tier 3 networks always pay fees to obtain access to the larger backbones.

ARPAnet to NSFnet to Tier 1
ARPAnet was the original Internet backbone, which was superseded by the National Science Foundation Network (NSFnet) in the late 1980s. NSFnet was replaced by Tier 1 networks in the mid-1990s when the Internet became a commercial venture. See ARPAnet, NSFnet and Internet.
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References in periodicals archive ?
More recently, III Corps was tasked with implementing and integrating a combined Defense Information Systems Agency Asynchronous Transfer Mode and commercial T1 network to support the III Corps tactical command post while deployed to Korea for Ulchi Focus Lens 2005.
Optivision's interoperable, network-attached, streaming video components support both LAN and WAN industry standards, including IP/Ethernet, ATM, Gigabit Ethernet, and T1 network interface, offering a broad range of high-quality streaming video applications and ease-of-implementation in a variety of network environments.
The information moves automatically over the district's high-speed T1 network to the central database on a daily basis.
However, its digital T1 network with a ring topology had significant bandwidth issues and, in 1995, Honor committed to migrating to a more cost-effective Frame Relay solution.
The T3 network provides a 28-fold increase in raw capacity over the T1 network (from 1.544Mb per second to 44.736Mb per second).
When initially considered in 1987, the T3 network had a cost that was about 10 times that of the T1 network. Since then the price has declined to its present four times the cost of a T1.
The Access Bank II includes two T1 network interfaces with fully integrated CSU and Data Service Units (DSU), offering up to 3 Mbps of total throughput.
The most popular models provide a single data connection and a single T1 network connection.
We are adding a scheduling system for statewide resources and connecting the T1 network into other private networks."
But since the T1 network cuts our call costs to less than half what we pay using the public switched network, it is important that each network site be carefully configured.
Twenty to 50 megabyte files of circuit board designs and product blueprints had to be routinely transported across the T1 network among campuses in Chippewa Falls.
The high-speed Omnimux T1 network maximizes IS network resources by transporting voice and all corporate data as well as two-way radio and protective relay.