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LAN Glossary
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
478
L LAN
See local area network.
LAN emulation (LANE)
A technique that lets ATM networks communicate with Ethernet LAN cards.
ATM service is not widely available at the desktop and ATM interface cards are
expensive, so ATM networks usually emulate LANs when communicating with
user terminals. Typically, a LAN-emulation configuration server (LECS)
keeps track of the relationships between ATM-network addresses and IP
addresses on the LAN. Each ATM card is then treated as a client of a
LAN-emulation server, which connects the ATM cards to the LAN cards on
the user terminals.
LAP-D
See link-access procedure on the D-channel (LAPD).
LECS (LAN-emulation configuration server)
See LAN emulation (LANE).
LES (LAN-emulation server)
See LAN emulation (LANE).
line coding
Line coding is the data format that lets either end of a communications channel
correctly interpret messages from the other. Line coding systems specify the
voltage levels and patterns that represent binary digits (1s and 0s), based on the
requirements of the transmission network. The AT&T network has two: it
demands that the net voltage on the line equal 0 volts DC and it demands a
minimum Open System Interconnect (OSI) Model. The T-carrier system meets
the first requirement by using a bipolar line-coding scheme called Alternate
Mark Inversion (AMI). It meets the second with one of several supplementary
coding schemes, including ZCS, Bipolar 8 Zero Substitution (B8ZS), and High
Density Bipolar 3-Bit Substitution (HDB3).
line compensation
An allowance for pulse distortions in the cable that connects the MMCX server
to the first channel service unit (CSU) on the PRI span. It is proportional to the
length of the cable. T1 circuit packs adjust the outgoing signal so that it arrives
at the far end without distortion.
link
A transmitter-receiver channel that connects two systems.