In the present age of globalisation, businesses are spread all around the world. In order to operate the business smoothly, there is a strong need for a dedicated telecom link that can connect geographically spread out locations of several businesses. The telecom facility may be either shared such as dial-up lines or non-shared such as leased lines and managed leased line networks (MLLNs). Obviously, businesses prefer a highly secured dedicated non-shared communication facility that is available all the time.

Fig. 1: A typical MLLN set-up
Fig. 1: A typical MLLN set-up

A leased line is a dedicated link or telecommunication path provided between two fixed locations, which is made available round the clock for use by the designated user (an individual or a company). Leased lines are provided to users for internal communication between their different business centres/offices/factories at various locations within a city or different cities on a point-to-point basis or on a network basis.
These leased lines can carry voice, data and video and can be used for connecting telephone sets, computers, electronic private automatic branch exchange (EPABX) and for establishing a virtual private network (VPN). These lines are exclusive for the designated user and are particularly not shared in common amongst multiple users as dial-up lines.

Such ordinary leased lines are not very efficient and have lots of disadvantages such as limited range of services, bandwidth support only up to 64kbps (2.4kbps, 4.8kbps, 9.6kbps and 64kbps), no support for n×64kbps bandwidth provisioning, cumbersome operation and vendor-specific equipment.

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Other disadvantages are first-generation network elements with minimal maintenance features, difficult fault isolation and rectification, no centralised alarm or performance statistics monitoring, no health diagnostics for the network, high lead time for new circuit installation, manual verification of resources needed, cross-connection of individual circuits done at the channel level, poor customer satisfaction, no proactive maintenance, high mean time to repair (MTTR), no guaranteed quality of service (QoS), no way to measure circuit quality or generate customised performance reports, poor network reliability and availability, non-redundant network elements, no alternate routing of circuits in case of failure and no centralised network management system (NMS).

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Applications of MLLN
Managed leased line network (MLLN) is a system that can provide leased line connectivity, that is, a dedicated telecommunication path between two fixed points. It is an integrated, fully managed, multi-service digital network platform through which a service provider can offer a wide range of services at an optimal cost to business subscribers. MLLN allows the service provider to keep an end-to-end control and monitor over the leased line and hence provide guarantees of uptime of the circuit.

With the use of managed leased line circuits by various sectors such as banking and financial institutions, stock markets, news and print media industry, broadcasting houses and Internet service providers (ISPs), people of all the sections are benefitted by way of accessibility of bank accounts from anywhere, instant news coverage, faster Internet access, etc.

The applications/services offered by MLLN are:
1. Speech circuits (hot line or P-wire). Dedicated telecom links for speech, say, hot line for voices between two different locations is established by local or long-distance circuits within a city or between two different cities. The terminating equipment at both ends is telephone set without dialling facility. In such a connection, both-way signalling and speech is possible.

2. Data circuits. Dedicated local or long-distance point-to-point or point-to-multipoint data circuits at different speeds, namely, n×64kbps and up to 2Mbps can be offered for different bandwidth needs of the customer. MLLN offers flexibility of providing leased circuits with speeds of n×64kbps and up to 2Mbps with differential time-dependent bandwidth provisioning.

3. Private data network. More than one local or long-distance leased circuits can be provided such that data from one leased circuit can be transferred automatically to another leased circuit for the same subscriber.

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4. International leased circuits. International long-distance leased circuits can be offered for business across the globe, which are useful for Internet leased lines and international private leased circuits (IPLCs).

The MLLN also supports enhanced features such as corporate hi-speed Internet access, EPABX interconnection, EPABX remote extension (EPABX of one city can be connected to EPABX of another city), ISDN (integrated services digital network) line extension, virtual private network (VPN), local area network (LAN) interconnection (LAN of one city can be connected to LAN of another city) and extension of VPN to customer through MLLN. A typical MLLN system connecting various facilities of a customer is shown in Fig. 1.

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