Glossary

Glossary - L

LAN

Local area network.

LCR

Least cost routing.

LDN

Listed directory number. This is generally an organization's central telephone number which appears in the telephone book.

Leased Line

A permanent but reliable and cost-effective connection that exists between business sites is without doubt essential when communication is regular. A digital leased line provides the link between two sites and enables uninterrupted, private data and voice transfer. A fixed fee may be required for an agreed level (capacity) and then generally you can make an unlimited number of calls and data transmissions and no face a per minute charges.

Leased lines (also known as private circuits)

Leased lines exist as a permanently connected communications link that connects between two premises and is dedicated to the customers' exclusive use.

LEC

Local exchange carrier.

Local Area Network (LAN)

LAN exists as a premises high-speed (generally in the range of around 10 Mbps) data communications system. Within this all segments of the medium used for transmission (this is typically coaxial cable, or twisted pair or optical fiber) and are contained within a campus or office environment.

Local area networks (LANS)

This is a network that allows the intercommunication and interconnection of a group of computers. It is primarily used for the exchange of information (for example e-mail) and also the sharing of resources.

Local Channel

A local channel is the local loop which connects a customer premises to the serving LEC wire centers in LEC tariffs. In IXC tariffs it is the network components for example, transmission, switching or another, and is used to connect a customers premises to serving IXC POPs.

Loop Length

Generally, a loop length is a complete electrical circuit. It is the pair of wires that winds its way up from the central office upto the telephone system at the customer's premises.

Local loop

The local loop is the access network connection that exists between the the local PSTN exchange and the customer's premises. Its usually a loop comprised of two copper wires.

Local loop unbundling (LLU)

This is the process by which BT's exchange lines become physically disconnected from the BT network and then connected to another operators' network. This enables an operator other than BT to be able use BT's local loop and to provide services to customers.

Local rate

This is the rate for calls that occur within the local area. The area is defined by the telecommunications operator that is serving the customer.

Loop Signaling

Loop signaling exists as a method of signaling that performs over dc circuit paths and utilizes the metallic loop that is formed by the trunk or line conductors and also terminating circuits.

Loop Start

Loop start exists as a supervisory signal that is given at a telephone or PBX as a response to the closing of the loop's DC current path.

LSI

Large-scale integrated circuit.