Troubleshooting Terminal, Printer, and Serial Device Connections - Edition 5 (32022-90058)

Glossary
113
Glossary
A
access port A special interface card in the system
cabinet through which the MPE/iX system console is
connected.
ADCP Avesta Device Control Protocol. An HP
proprietary protocol which provides device control
features. ADCP is optimized for communications
between a DTC and MPE/iX systems.
address A numerical identifier defined and used by
a particular protocol and associated software to
distinguish one node from another.
address key See X.25 address key.
address resolution In NS networks, the mapping
of node names to IP addresses and the mapping of IP
addresses to subnet addresses.
address resolution protocol (ARP) A protocol
used to convert an IP address to a low level
hardware address. ARP can be used only over a
single physical network and is limited to networks
that support hardware broadcast.
adjacent A node on a point-to-point network that is
connected to another node by a single link with no
intervening nodes.
ADP Active Distribution Panel. See MDP.
AFCP Avesta Flow Control Protocol. An HP
proprietary protocol which provides data flow control
features. AFCP is optimized for communications
between nodes, including DTCs, in an MPE/iX
environment.
ARP See address resolution protocol.
ARPA Advanced Research Projects Agency. It is the
former name of the Defense Advanced Research
Project Agency (DARPA). The Internet suite of
protocols was developed under ARPA guidance.
ARPA Telnet Access An HP product which is a
board that can be installed in a DTC 48 and
DTC 72MX. The Telnet Access board performs
protocol translation. Calls to the IP address of an
MPE/iX system are detected by the Telnet Access
board and are retransmitted on the LAN using
AFCP, allowing connections from terminals on ARPA
systems to HP 3000s.
ARPA Telnet Express An HP product which is a
standalone hardware platform dedicated to
performing protocol translation. Calls to the IP
address of an MPE/iX system are detected by the
Telnet Express and are retransmitted on the LAN
using AFCP, allowing connections from terminals on
ARPA systems to HP 3000s.
ASCII American National Standard Code for
Information Interchange. A character set using 7-bit
code used for information interchange among data
processing and data communications systems. The
American implementation of International Alphabet
No. 5.
asynchronous A device’s mode of operation in
which a sequence of operations are executed
irrespective of time coincidence with any event.
Devices that are directly accessible by people (for
example, terminal keyboards) operate in this
manner.
asynchronous processor board The new 24-port
mux board for the DTC 72MX. Allows up to 24 direct
and modem connections per board. A DTC 72MX can
have up to 3 asynchronous processor boards (for a
total of 72 connections).
asynchronous processor board The new 24-port
mux board for the DTC 72MX. Allows up to 24 direct
and modem connections per board. A DTC 72MX can
have up to 3 asynchronous processor boards (for a
total of 72 connections).
Attachment Unit Interface AUI. The cable that
runs between each node (host, DTC, or other device)
and the Medium Attachment Unit (MAU) that
connects it to the LAN in a ThickLAN configuration.
autodial A dial link in which the remote node’s
telephone number is automatically dialed by a
modem or other device with this capability.
B
backbone LAN A thick LAN cable conforming to
the IEEE 802.3 Type 10 BASE 5 Standard.
back-to-back configuration A DTC configuration
whereby MPE users connected to one DTC can
communicate with a non-MPE/iX system connected
to another DTC via the LAN. See also Local
Switching.