Glossary
302 Perle 833IS User Guide
Multicast
The broadcasting of messages to a specified group of
workstations on a LAN, WAN, or internet.
Multiplexing
The transmission of two or more signals over a single
channel.
NAK (Negative Acknowledgment)
A communication control character sent by the receiving
destination indicating that the last message was not
received correctly.
NDIS (Network Driver Interface Support)
A device driver specification that supports both MS-DOS
and OS/2. By offering protocol multiplexing it allows
multiple protocol stacks to coexist on the same host. see
protocol stack
NetBEUI (NetBIOS Extended User Interface)
A transport layer driver often used by Microsoft’s LAN
Manager, Windows for Workgroups and Windows NT.
NetBIOS (Network Basic/Input Output System)
A Software system originally developed by IBM and Sytek
that links network software to network adaptors. For a non-
IBM network operating system to run an application that
works with NetBIOS, it must have a NetBIOS emulator. see
emulation
Network Broadcast Address
Network broadcast messages are used to inform systems
on the network about the structure of the network. The
Network Broadcast Address is the address used to send
and receive these messages.
Network Number
The part of an Internet Address that indicates the network
that the host belongs to.
OSI (Open Systems Interconnection model)
A model developed by the ISO used to define network
architecture.
Packet
A unit of data transmitted on a network. Sometimes referred
to as a frame.
PAP (Password Authentication Protocol)
Standard authentication protocol for PPP connections. see
CHAP
PBX (Private Branch eXchange)
A smaller version of the telephone company’s switching
network for voice and data that is located on the customers
site and owned by the customer.
PPP (Point to Point Protocol)
A form of transmission using telephone lines. It provides
router to router and host to network connections. These
connections can be over either synchronous or
asynchronous circuits.
PRI (Primary Rate Interface)
One of two interface’s in ISDN. Consists of 23B, or bearer
channels and one D, or data channel. see BRI and ISDN
Protocol
A set of rules for exchanging data across a network.
Protocol Filter
Allows a network bridge to be programmed to send or reject
transmissions according to specified protocols.
Protocol Stack
A set of protocol layers that provides reliable
communication between one computer and another or a
network. see protocol
Rack Mount
Supplied with the unit. Allows the 833IS to be mounted on a
rack.
RADIUS (Remote Authentication Dial In Users
Services)
An open standard network security server that
communicates in both CHAP and PAP protocols.
RARP (Reverse Address Resolution Protocol)
A low level TCP/IP protocol used by a workstation to obtain
the logical IP address of a node.
Remote Node Support
The ability of the 833IS to treat a remote user as if they were
in "the office". By dialing in they become part of the LAN.
RFC (Request for Comment)
Standards, procedures and specifications for various TCP/
IP protocols.
RIP (Routing Information Protocol)
A protocol that allows gateways and hosts to exchange
information about various routes to different networks.