Glossary
Perle 833IS User Guide 301
Encapsulate
The carrying of frames of one protocol as data in another.
TCP/IP is an encapsulating protocol.
Errored Seconds
Number of seconds within the current interval (a 15 minute
period) that errors have occurred.
Ethernet
A high-speed (10Mbps,100Mbps) cable technology that
connects devices to a LAN, using one or more sets of
communication protocols.
Feature Card
An optional circuit board addition that increases the
capabilities of the 833IS. The card can be installed by the
reseller. Available cards are Token Ring, Ethernet, ISDN
BRI U, ISDN BRI S/T and PerleDSP Modem.
Fixed Callback
A method where the number used for callback is contained
within the 833IS database.
Frame
A group of data bits organized in a specific format. These
groups are sent serially and contain flags at each end to
indicate the beginning and end of the frame.
Framing
An error control procedure. Used on digital multiplexed
channels.
Gateway
Can be described as an entrance and exit to a Network. A
Gateway has its own processor and memory and is used to
connect two or more networks at the upper protocol layers
of the OSI reference model. The networks can use different
protocols and different physical media.
IEEE (Institute of Electrical and Electronic
Engineers)
A standard setting body that sets specifications for and
relating to LAN’s.
Internal Pool
A database contained within the memory of the Perle
833IS.
IP (Internet Protocol)
A protocol that manages the routing of data packets
between stations on the same or different networks.
IPX (Internet Packet eXchange)
A network transfer protocol from Novell, Inc.
ISDN (Integrated Services Digital Network)
A public telecommunications network that supplies end to
end digital telecommunications services that can be used
for both voice and non-voice data. See BRI.
IP Subnet Mask
see subnet mask
LAN (Local Area Network)
A Network system that does not use Long Distance
carriers. A LAN is usually limited by cable length
restrictions.
Logical Link Control (LLC)
The IEEE 802.2 Standard that corresponds to the ISO
model’s Data Link layer. LLC covers station-to-station
connections, generation of message frames, and error
control.
Local Security
Uses the user ID and password stored within the 833IS
User database. When the remote Client connects, it will
communicate with the 833IS using either the CHAP or PAP
security protocols.
MAC (Media Access Code)
The lower half the data link layer specified in 802.3. It
contains the specification for the LAN frame format and the
rules for accessing the hardware of the network.
MAU (Multistation Access Unit)
A wiring concentrator used in LAN’s. It allows PCs’, printers,
and other devices to be connected in a star-based
configuration to a Token Ring or Ethernet.
Modem (MODulate/DEMmodulate)
A device that translates digital signals to a modulated form
so that it can be transmitted over a telephone line. The
modem can also reverse this process and receive signals.
Modem Initialization String
A series of commands sent to the modem by a
communications program at start up and before a number
has been dialed. These commands tell a modem how to set
itself up in order to communicate easily with another
modem.