Digi PortServer II, Руководство пользователя

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90030500B Glossary Page 247
Frame
The smallest unit of data on a network. Each frame con-
tains source and destination addresses, length field, data,
and checksum elements.
Frame Relay A network interface standard derived from narrowband
ISDN technology, in which frames of data are relayed on a
public frame relay service. See ANSI Standard T1.606 or
ITU-T (CCITT) Standard I.233 for more information.
FTP File Transfer Protocol. An IP application protocol for
transferring files between network devices.
ICMP
Internet Control Message Protocol. A subset of the Inter-
net Protocol (IP) that handles error monitoring and testing.
Intranet A network that is based on the Internet architecture, but is
restricted to a single site or company.
IP Internet Protocol. See RFC791 for more information.
LAN
Local Area Network. A network covering a relatively
small geographic area, usually not larger than a small
building. LANs usually provide a relatively high data rate
and low error rates.
LCP Link Control Protocol. Used on PPP connections for test-
ing and configuring the link.
Link A network communications channel consisting of a circuit
or transmission path, including all equipment, between a
sender and receiver.
LMI Local Management Interface. A protocol for managing
Frame Relay connections, for example, ANSI T1.617
Annex D or ITU (CCITT) Q.933 Annex A.
MIB Management Information Base. The database of parame-
ters that an SNMP server can read from an SNMP-compat-
ible device such as PortServer II. See RFC1213 for more
information.
Modem Modulator-demodulator. A device that converts digital
signals for transmission over analog telephone lines, and
vice versa.
NIS Network Information Services.
Packet
A logical grouping of data in a transmission that normally
includes a header and user data.