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A Discussion On Different Types Of Leased Lines On Offer Through Colo Providers

By Marisol Everett


A colocation service can offer businesses a variety of leased lines. A leased line is always active (i.e. the connection is permanently on), it is not shared and it offers guaranteed bandwidth. There are many reasons why companies may want to utilise a leased line, for example if they need excellent quality 24/7 internet access along with a good Service Level Agreement, or they need to run mission critical applications or perhaps if fast upstream speeds are required. There are a number of different types of leased lines available, a few of which are discussed below.

Ethernet leased lines are one of the most widespread lines available today. They offer point-to-multi-point or point-to-point connectivity at speeds of 1Mbps to 1Gbps. The great scalability of this line makes it a practical choice for companies looking for a leased line from their server co-location service host. The line cost differs depending on the distance between a client and the Point of Presence (POP), being cheaper the closer the client is to the POP. The upfront lease charges from the co-location provider may be quite high but over an extended period of time the on-going charges may work out much cheaper than other options.

A colo provider may offer a Digital Data Service (DDS) line option to its customers, which has a connection speed of 64Kbps to 2Mbps and which is a dedicated point-to-point WAN connection. Generally with these kinds of lines large amounts of data can be transferred at faster speeds with less errors occurring compared to using other types of leased lines.

A colo provider may offer a Data Access Radial line, a point-to-multi-point WAN connection capable of speeds between 64Kbps and 2Mbps and which is delivered to G.703, G.704, X.21 and V.35 interfaces.

An E1 line (utilised in Asia and Europe) is a line that a colocation service might provide for transmitting digitally over Synchronous Digital Hierarchy. It offers point-to-point WAN connectivity to an Ethernet, G.703 or X.21 interface and reaches speeds of 2Mbps. 32 channels transmit 64Kbps each to achieve 2Mbps connectivity speed and two channels are kept for signalling and controlling purposes. The T1 line is the U.S. version of the E1 line and it can reach up to 1.5 Mbps via 24 channels transmitting 64Kbps each. The E1 (or T1) connection can be divided into different channels to allow for voice and data communication or alternately it can serve as a single high speed data connection. It is possible to utilise just a few of these individual channels instead of paying for all 32 or 24, and these individual channels are referred to as fractional E1's or T1's.

The above is a small selection of the leased lines that a co-location host may be able to offer a business. Leased lines range in speed and cost so companies can choose one that meets their needs whilst fitting into their budget. It is important for businesses to check through the Service Level Agreement between them and the leased line colo provider before agreeing to lease the line in order to make sure that all their needs are covered and that they agree with the level of service that the co-location host will give.




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