LEC

1) LAN Emulation Client

An entity in an end system that performs data forwarding, address resolution, and other control functions for a single end system (ES) within a single emulated LAN (ELAN). A LEC also provides a standard LAN service interface to any higher-layer entity that interfaces to the LEC. Each LEC is identified by a unique ATM address, and is associated with one or more MAC addresses reachable through that ATM address. See also ELAN and LES.

2) local exchange carrier

A local or regional telephone company that owns and operates a telephone network and the customer lines that connect to it.