Motorola FR68 Series, Руководство пользователя, Страница: 136 / 142

G l o s s a r y
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specific bar code scanned.
E
ESD.
Electro-Static Discharge
F
Flash Memory
Flash memory is nonvolatile, semi-permanent storage that can be electronically erased in the
circuit and reprogrammed. FR68 Series mobile computers use Flash memory to store the
operating system (ROM-DOS), the terminal emulators, and the Citrix ICA Client for DOS.
H
Hz.
Hertz; A unit of frequency equal to one cycle per second.
Host Computer.
A computer that serves other terminals in a network, providing such services as
computation, database access, supervisory programs and network control.
High-Speed Downlink Packet Access (HSDPA).
A 3G (third generation) mobile telephony
communications protocol in the High-Speed Packet Access (HSPA) family, which allows networks
based on Universal Mobile Telecommunications System (UMTS) to have higher data transfer
speeds and capacity.
I
IEC.
International Electrotechnical Commission. This international agency regulates laser safety
by specifying various laser operation classes based on power output during operation.
IP.
Internet Protocol. The IP part of the TCP/IP communications protocol. IP implements the
network layer (layer 3) of the protocol, which contains a network address and is used to route a
message to a different network or subnetwork. IP accepts “packets” from the layer 4 transport
protocol (TCP or UDP), adds its own header to it and delivers a “datagram” to the layer 2 data link
protocol. It may also break the packet into fragments to support the maximum transmission unit
(MTU) of the network.
IP Address.
(Internet Protocol address) The address of a computer attached to an IP network.
Every client and server station must have a unique IP address. A 32-bit address used by a
computer on a IP network. Client workstations have either a permanent address or one that is
dynamically assigned to them each session. IP addresses are written as four sets of numbers
separated by periods; for example, 204.171.64.2.
K
Key.
A key is the specific code used by the algorithm to encrypt or decrypt the data. Also see,
Encryption
and
Decrypting
.