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LAN

Local Area Network - A computer network limited to the immediate area, usually the same building or floor of a building.

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LAN Interconnection

Using ISDN an organization can connect LANs at different locations into a WAN (Wide Area Network) on a dial up basis, without the need for a permanent, expensive, leased data link.

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LAN Telephony

The convergence of voice and data on a LAN, eliminating the need for separate voice and data networks within an organization.

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Latency

The amount of end-to-end delay in a network path or channel.

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LCD

Liquid Crystal Display
A display panel found on many phones capable of showing text prompts or messages.

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LCR

Least Cost Routing
 - The process that provides customers with cheap telephone calls. Within a telecoms carrier, an LCR team could choose routes from between twenty to over one hundred suppliers for national and internal numbers on a weekly or even daily basis to maintain a competitive cost base and acceptable call quality. The LCR team also has to take route and call quality into account. The quality of route to a destination can vary considerably between suppliers and even from week to week from the same supplier.