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Glossary
See SHDSL.
G.SHDSL
See GUI.
graphical user
interface
graphical user interface. A user environment that uses pictorial as well as textual representations of
GUI
the input and the output of applications and the hierarchical or other data structure in which
information is stored.
H
See hs.
handshake
High-Level Data Link Control. Bit-oriented synchronous data link layer protocol developed by ISO.
HDLC
Derived from Synchronous Data Link Control (SDLC), HDLC specifies a data encapsulation method
on synchronous serial links using frame characters and checksums.
(1) The protocol control information that is located at the beginning of a protocol data unit. (2) The
header
portion of a message that contains information to guide the message to the correct destination and
contains, for example, sender and receiver addresses and routing instructions.
See HDLC.
High-Level Data Link
Control
Computer system on a network. Similar to the term node, except that host usually implies a computer
host
system; node generally applies to any networked system, including access servers and routers. See
also node.
Feature that permits the addition, replacement, or removal of cards or modules without interrupting
hot swapping
the system power, entering console commands, or causing other software or interfaces to shut down.
Sometimes called "online insertion and removal" or "power-on servicing." Removal of some cards
causes interruption to some or all of the system.
handshake. Sequence of messages that are exchanged between two or more network devices to ensure
hs
transmission synchronization.
I
input/output card or module.
I/O card or
I/O module
IMA control protocol cell. IMA control protocol cell used for aligning the cells in multiple links.
ICP cell
ISDN digital subscriber line. An xDSL technology that uses ISDN technology to deliver data at speeds
IDSL
of 128 Kbps over copper loops as long as 18,000 feet. IDSL is reserved for data communications only.
Compare with ADSL, SDSL, and SHDSL. See also DSL.
Institute of Electrical and Electronics Engineers. A U.S. publishing and standards organization
IEEE
responsible for many LAN standards.
Cisco 6260 Hardware Installation Guide
GL-16
OL-2365-02
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