X25AM Configuration and Management Manual

Glossary
X25AM Configuration and Management Manual—523424-004
Glossary-11
wide area network (WAN) subsystem
wide area network (WAN) subsystem. The Subsystem Control Facility (SCF) subsystem
for configuration and management of wide area network (WAN) objects on NonStop
S-series servers.
window size. Maximum number of packets or frames that can be transmitted without being
acknowledged.
X3PAD. Program provided with X25AM that supports communications from a local terminal
to remote entities in the network by means of an X25AM process.
X.21. Standard related to X.25. Recommendation for the physical layer interface, designed
for digital circuit-switched networks.
X.21 bis. Standard related to X.25. Recommendation for the physical layer interface,
functionally equivalent to the electrical interfaces RS-232-C and V.24. Also adapts to
provisions of RS-449 and ITU-T V.25.
X25AM. An HP product for X.25 communications. The X25AM product is a subsystem,
consisting of one or more I/O processes, the lines controlled by the I/O processes, and
the subdevice(s) associated with each line.
X.25. Set of international recommendations for the connection between computers,
terminals, or other devices and a public or private packet-switching network.
X.28. Standard related to X.25. Defines how an asynchronous device communicates with a
PAD in the same country.
X.29. Standard related to X.25. Defines how X25 DTE controls the operation of a PAD
during communications with an asynchronous DTE.
X.75. Standard related to X.25. Defines how to connect public packet-switching data
networks through a gateway interface.
X.121. Standard address format for X.25 connection. It uniquely identifies a country or
geographical area, a network, and a subscriber. An X.121 address can contain up to
15 digits. See also Data Network Identification Code (DNIC).
$ZZWAN. The process name of the wide area network (WAN) subsystem manager process.