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Glossary
8000-A2-GB26-50 April 2001
GL-3
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 for high bandwidth, bidirectional
transmission over copper wire for T1 and E1 services.
host
A computer attached to a network that shares its information and devices with the rest of the
network.
host route
An IP address having a subnet mask of 255.255.255.255.
hub
A device connecting several computers to a LAN.
ICMP
Internet Control Message Protocol. An Internet protocol that allows for the generation of
error messages, test packets, and information messages related to IP.
IDSL
ISDN DSL using 2B1Q line code.
IEEE
Institute of Electrical and Electronic Engineers.
Internet
The worldwide internetwork that predominantly uses the TCP/IP protocol.
intranet
A private network or internet using Internet standards and software, but protected from
public access.
IP
Internet Protocol. An open networking protocol used for internet packet delivery.
IP address
Internet Protocol address. The address assigned to an Internet host.
ISP
Internet Service Provider. A vendor who provides direct access to the Internet.
IUT
ISDN U-Interface Transceiver (Motorola mc145572).
LAN
Local Area Network. A privately owned and administered data communications network
limited to a small geographic area.
link
The physical connection between one location and another used for data transmission.
MAC
Media Access Control. The lower of the two sublayers of the data link layer, the MAC
sublayer controls access to shared media.
MAC Address
Media Access Control Address. The unique fixed address of a piece of hardware, normally
set at the time of manufacture, and used in LAN protocols.
margin (DSL)
The additional noise, measured in dB, that would need to be added to the existing noise on
a given DSL loop to bring the Bit Error Rate to IE–7 (10
7
).
MCC
Management Communications Controller. The circuit card used to configure and monitor
the DSLAM. MCC cards include the MCC, MCP and MCC Plus.
MCP
Management Communications Processor. The circuit card used to provide consolidated
management access for DSL cards in a Hotwire 8820 GranDSLAM chassis as well as in the
8610 DSLAM chassis.
MIB
Management Information Base. A database of managed objects used by SNMP to provide
network management information and device control.
M/SDSL
Multirate Symmetric Digital Subscriber Line. (See SDSL.)
MTU
Maximum Transmission Unit.
MVL
Multiple Virtual Lines. A proprietary local loop access technology that permits several
services to concurrently and discretely use a single copper wire loop.
MVL card
A card with MVL ports used in the DSLAM and Hotwire GranDSLAM.