Glossary

LAN (Local Area Network)

A general-purpose communications network that interconnects a variety of devices within a limited geographical area. Two common LANs, IEEE 802.3 and Ethernet, have compatible cabling requirements, and can co-exist on a common installation, but have different protocols. A LAN might connect computers on adjacent desks, within a building, or within several buildings of a campus. See also extended LAN.

LAN cable

A short distance network (up to a few thousand meters) used to connect many network devices using a communication standard. LAN cables come in many types. For example, thick (10 mm) coaxial cable, thin (5 mm) coaxial cable, fiber- optic cable, and twisted-pair cable.

LAP-F (Link Access Procedure, Frame-Relay)

HDLC derivative level 2 link protocol required by Frame Relay.

Layer

A level in the hierarchy of telecommunications protocols. Protocols in the higher layers inter-operate with those in the lower layers.

LCI (Logical Channel Identifier) also called Combined LCN

The combination of the 4 LGCN and 8 LCN bits into a 12 bit virtual circuit identifier field. The range is 0 to 4095

Leased Line

Permanent link in a data communication network provided by a commercial communications supplier.

Leased Line

Permanent connection for private use within a data communication network independent of the public switching and signalling equipment.

Line

T1 and E1 equivalent of DCE. The signal from the Central Office to the User.

141

Page 161
Image 161
Agilent Technologies J3916A manual LAN Local Area Network, LAN cable, LAP-F Link Access Procedure, Frame-Relay, Layer, Line