What is Leased Lines, its advantages and disadvantages

Leased Lines 

If you are not satisfy with your internet speed, use leased lines connection for very high internet speed. Leased lines are also known as dedicated lines or private lines. It's very safe and secure lines. Leased lines are dedicated point-to-point circuits provided  by telecommunications carrier for a fee. High-Availability Leased Lines (HA-LL) is a product flavor of the leased line service, which can provide customers with a very high uptime (99.98%) even in case.

Best Internet Service Providers (ISP) in India:

• Atria Convergence Technologies (ACT) 
• Mahanagar Telephone Nigam Ltd (MTNL) 
• Hathway Cable & Datacom
• Hayai Broadband Pvt. Ltd
• YOU Broadband India Ltd 
• Tikona Infinet Ltd 
• SmartLink Broadband 
• Tata Docomo
• Bharti Airtel 
• Reliance Communication 
• Vodafone etc...

In India, leased lines are available at speeds of 64 Kbit/s, 128 kbit/s, 256 Kbit/s, 512 Kbit/s, 1 Mbit/s, 2 Mbit/s, 4 Mbit/s, 8 Mbit/s, 1000 Mbit/s T-1(1.544 Mbit/s) or E-1(2.048 Mbit/s) and up to 622 Mbit/s. Customers are connected either through OFC, telephone lines 'Asymmetric digital subscriber line (ADSL)', or through Wifi. Customers would have to manage their own network termination equipment, namely the channel service unit and data service unit.

In United States
T-1 lines are the most commonly used type of leased lines in the United States. T-1 lines offer a data transfer rate of 1.544 Mbps. A T-1 line consists of 24 channels and each channel supports a data transfer rate of 64 Kbps. It is possible to divide the T-1 line into individual 64 Kbps channels, or channels that are multiples of 64 Kbps, with a process called multiplexing. These channels can then be configured to carry separate voice, video and data information.

* T-1 lines are available only in the United States. In Europe and the Pacific Rim, E-1 lines are used. E-1 lines transmit data at a speed of 2.048 Mbps.

The T-1 line is popular because of the following characteristics:

• T-1 line is a digital technology, and therefore, provides better error performance and network capabilities when compared to analog technologies, such as the Plain Old Telephone Service (POTS).

• T-1 line are medium independent and can work with Unshielded Twisted Pair (UTP) cables, Shielded Twisted Pair (STP) cables, coaxial cables optical fiber cables, microwave, and infrared media.

• T-1 lines support the symmetric full duplex method of transmission. Symmetric full duplex means that data transfer can simultaneously occur in both directions at the same rate.

A variant of T-1 lines, called fractional T-1, is also a popular connectivity option. When a T-1 line is leased, an organisation needs to pay for the entire 1.544 Mbps bandwidth irrespective of how much traffic is actually transmitted  across the line. Fractional T-1 allows organisations to lease only the required number of channels (out of the 24 channels). For example, an organisation may lease 10 channels to obtain a combined bandwidth of 640 Kbps. Fractional T-1 is usually preferred by organisations when leasing an entire T-1 line is unaffordable, or when the bandwidth offered by the entire T-1 line is not required.

In addition to the T-1 lines, a newer line, T-3 that offers data transfer rates of 44.736 Mbps, is also available. T-3 lines are preferred by organisations that entire extremely high data transfer rates for applications such as video conferencing data transmitted on a carrier network or ERP access. However T-3 lines run only on optical fiber and microwave media because coaxial cables, and twisted pair cables do not support high signaling rate over long distances.

*T-1 and T-3 lines are also referred to as Digital Signal Level 1 (DS-1) and DS-3 lines.

Leased lines offer faster data transfer rates, and are cost-effective when the data transmitted over the networks is high and on a continuous basis. The cost of a leased line typically depends on the distance between the two end points, the speed of the circuit and the Quality of Service(QoS). Leased lines are generally used by organisations that have their business officers spread across significant geographical regions, and require high-speed connections.

Disadvantage 

The main disadvantage with leased line is that the access charges for a line are constant irrespective of the actual bandwidth used. For example, the cost of a T-1 line over a distance of five miles, remains the same even if the organisation  uses only a bandwidth of 1Mbps for data transfer. To overcome this drawback of leased lines, Integrated Service Digital Network (ISDN) was introduced , in which the organisation or the subscriber has to pay depending on the amount of bandwidth used.

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Thanks a lot for reading!
Neel Kamal