| By :
Dirik Hameed
A colocation service can offer businesses a variety of leased lines. Leased lines have an always-on connection that provides a guaranteed amount of bandwidth and which is not shared by anyone else except the business leasing the line. 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. The speed of such a line can be anywhere from 1Mbps to 1Gbps and the line can be used for both point-to-point and point-to-multi-point connections. The colo service can easily scale this line up or down, making it an attractive option for businesses whose connectivity requirements may change quickly. 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 Digital Data Service (DDS) line provides a dedicated WAN connection that is point-to-point and the colo host can offer speed availability between 64Kbps and 2Mbps. A DDS line usually provides greater ability than other kinds of leased lines to send lots of data quickly without errors happening. A colo host may provide point-to-multi-point WAN connectivity via a Data Access Radial line which can offer speeds up to 2Mbps and which can be delivered to a V.35, G.703, G.704 or X.21 interface. A common European and Asian line that a colocation service might provide which is used for digitally transmitting over Synchronous Digital Hierarchy is the E1 leased line. It can provide up to 2Mbps WAN point-to-point connectivity delivered to an Ethernet interface, X.21 interface or G.703 interface. 32 channels transmit 64Kbps each to achieve 2Mbps connectivity speed and two channels are kept for signalling and controlling purposes. A similar line in the United States is the T1 line that can transmit up to 1.5 Mbps through 24 channels each carrying 64Kbps. 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 lines discussed above are just some of the options a co-location host may provide for a customer. Leased lines vary on the speeds they provide and how much it costs to lease them so businesses should be able to find lines that suit their requirements and their budgets. Businesses must carefully read the colo provider's Service Level Agreement before leasing a line to ensure that the service provided by the co-location host adequately fulfils the business's requirements.
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