Introduction to Networking for NonStop S-Series Servers

Glossary
Introduction to Networking for HP NonStop S-Series Servers—520670-005
Glossary-2
Asynchronous Transfer Mode (ATM) protocol
Asynchronous Transfer Mode (ATM) protocol. A cell-switching and multiplexing
technology that combines the benefits of circuit switching (constant transmission delay
and guaranteed capacity) with those of packet switching (flexibility and efficiency for
intermittent traffic). ATM is a connection-oriented environment. The ATM subsystem is
the HP implementation of the ATM protocol.
asynchronous wide area network (AWAN) servers. A local area network (LAN)-based
communications device that provides (1) asynchronous connections to terminals,
printers, and terminal emulators for HP NonStop S-series and K-series servers; (2)
remote access disk operating system (DOS), Windows, and Macintosh computers; (3)
VT-to-6530 protocol conversion; and (4) dial-out connections for LAN-attached DOS,
Windows, and Macintosh computers.
Availability Statistics and Performance (ASAP). A monitoring tool that provides graphical
and tabular displays of system and network object performance, object state, and
entity threshold information. The Availability Statistics and Performance Extension
(ASAPX) product integrates and extends ASAP monitoring capabilities to single and
multinode application environments. For more information about ASAP, refer to the
following manuals: ASAP Client Manual, ASAP Server Manual, ASAP Extension
Manual, and ASAP Migration Guide for NSX and OMF Users. ASAP replaces NSX.
AWAN. See asynchronous wide area network (AWAN) servers.
bandwidth. The range of frequencies at which data can be transmitted on a circuit.
Bandwidth generally correlates with data rate: higher-bandwidth lines carry more data
in less time than do lower-bandwidth lines.
baseband. A signaling technique in which the signal is transmitted in digital form instead of
being altered by modulation. (Modems are not needed for baseband transmission.)
Twisted-pair wiring is the usual medium for baseband networks. Contrast with
broadband and carrierband.
Binary Synchronous Communication (BSC). A byte-synchronous communications
protocol
defined by IBM.
bisynchronous data transmission. Same as byte-synchronous data transmission
.
bit-synchronous data transmission. A method of data transmission that allows
synchronous, full-duplex data transmission, with bit insertion to permit data
transparency.
block mode. A type of operation in which a device saves up characters, attempting to
transmit them only when a function key or the Enter key is pressed. The block mode of
a terminal supports page mode applications.
bridge. A device that connects different local area networks (LANs) at the Data-Link Layer.
Layers above the Data-Link Layer are presumed to be alike on the networks. Contrast
with gateway.