| 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. Leased lines fulfil a number of functions, for instance round-the-clock internet access combined with an excellent Service Level Agreement, the ability to run mission critical applications, as well as providing quick upstream speeds. There are a number of different types of leased lines available, a few of which are discussed below. One of the most commonly available lines a business can get is an Ethernet leased line. 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. This line has very flexible scalability so a business can get its server colocation service provider to scale the line up or down as required. 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 initial costs associated with this kind of line may be quite expensive but it may ultimately work out much cheaper over the longer term than other line types the co-location host can offer. 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. A DDS line is usually the most reliable line in terms of sending a great deal of data at a fast rate without mistakes occurring. 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. 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 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. Instead of leasing 32 E1 channels or 24 T1 channels, a customer can instead lease less channels, thereby gaining fractional E1 access or fractional T1 access. In addition to the lines mentioned above, there are other leased lines that a co-location service might be able to provide for its clients. The variability in leased line costs and speeds means that businesses can pick a line within their budget that fulfils their needs. 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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