Glossary
Glossary-5
3360-A2-GB20-20
December 1996
framing
A technique that separates bits into identifiable groups.
Generic-Interface Extension
MIB
An extension to MIB II that defines additional objects for control of generic
interfaces in MIB II.
Get command (SNMP)
Read-only access to SNMP MIB objects.
ground
A physical connection to earth or other reference point.
G.703
The ITU (formerly CCITT) standard for the physical and logical characteristics of
transmissions over digital circuits.
G.703 DTE interface
The G.703 interface on the rear panel of the E1 NTU.
G.704
The ITU (formerly CCITT) standard for the physical and electrical characteristics
of digital interfaces.
HDB3
High Density Bipolar Three Zeros Substitution. A line coding technique used to
accommodate the ones density requirements of E1 lines.
HDLC
High-level Data Link Control. A communications protocol defined by the
International Standards Organization (ISO).
HDSL
High bit-rate Digital Subscriber Line. A technique that allows high bit-rate (E1)
digital signals to be transmitted over subscriber (local loop) lines.
host
A computer system used for application processing on a network.
Hz
Hertz. A unit of frequency that equals one cycle per second.
ICMP
Internet Control Management Protocol. The protocol that enables in-band control,
diagnostic, and error messages to be passed between nodes in an IP internetwork.
ID branch
Identity branch of the E1 NTU menu tree.
interface
A shared boundary between functional units.
Internet
The worldwide interconnected collection of networks that predominantly use the
TCP/IP protocol.
internetwork
An interconnected collection of networks (also called an internet).
IP address
Internet Protocol address. The address used by the SNMP manager to access the
device.
ISO
International Standards Organization.
ITU
International Telecommunications Union. The telecommunications agency of the
United Nations, established to provide standardized communications procedures
and practices.
kbps
Kilobits per second (thousand bits per second).
LAN
Local Area Network. A network that spans a small geographic area (e.g., a
building).
LCD
Liquid Crystal Display. Sealed glass plates containing liquid crystal material. When
voltage is applied, the amount of light passing through the plates is altered so that
messages may be displayed.
LCP
Link Control Protocol.
LED
Light-Emitting Diode. A status indicator that glows in response to the application of
a voltage.
link
A communication path between two network nodes.
link layer protocol
The protocol that regulates the communication between two network nodes.
