3Com OfficeConnect 3C892A, User Manual, Page: 124 / 130

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LOSSARY
Firmware
Firmware is the code which resides in the ISDN Modem and controls its behavior. It
differs from software in the form of programs that run on your computer.
IP address
An IP address is a set of numbers that uniquely identifies each device in a network.
ISDN
Integrated Services Digital Network. ISDN provides a digital telephone service
which allows both data and voice communication over the same telephone line
and at significantly faster speeds than the traditional POTs service. There are two
types of lines which provide access to ISDN, BRI and PRI.
Kbps
Kilobits per second. Kbps is the rate at which data is transmitted between
communication equipment such as ISDN modems.
Layer 1
In ISDN communications, the physical layer of communication between the
communications equipment. If layer one is down, there is no ISDN connection
between the devices.
Multilink PPP
Multilink Point-to-Point Protocol. Multilink PPP is a protocol which provides a
method for combining multiple PPP connections. With a BRI line, Multilink PPP
aggregates the two 56 Kbps or 64 Kbps ISDN B channels, creating a virtual single
digital connection of 112 Kbps or 128 Kbps.
Network terminator
(NT1)
A network termination device that terminates the ISDN line.The ISDN LAN modem
with the ISDN S/T interface (3C891) must be plugged into an NT1. An NT1 is built
into the ISDN LAN Modem with the U interface (3C892).
PAP
Password Authentication Protocol. PAP is one of two PPP authentication protocols
supported by the ISDN LAN Modem; CHAP is the other. An authentication
protocol requests information to verify a valid user. PAP requests the user’s name
and password for verification.
PC/TCP
PC/TCP is a PC version of TCP/IP created by FTP software.
POTS
Plain old telephone service.
PPP
Point-to-Point Protocol. PPP provides a standard method of transmitting data
through the Internet. PPP is used for communication between a computer and an
Internet service provider.
PPTP
Point-to-Point Tunneling Protocol. A protocol that allows a workstation to
establish a secure multi-protocol connection to a remote, private network via a
locally-dialed ISP account. See also VPN.
PRI
Primary Rate Interface. A PRI line is one of two access methods to the ISDN; BRI is
the other. Each PRI consists of thirty 64 Kbps B channels and one 64 Kbps
D channel
router
A router is a device that links networks.
TCP/IP
Transmission Control Protocol/Internet Protocol. TCP/IP is a standardized
communications protocol which allows different types of devices to communicate
with each other over LANs and WANs.
UDP
User Datagram Protocol. A connectionless protocol within TCP/IP that converts
application-generated data messages into packets that can be sent via IP. UDP
does not check for transmission errors therefore it does not perform