Hitachi AMS 2100 Hardware Manual page 295

Challenge Handshake Authentication Protocol
A security protocol that requires users to enter a secret for access.
CHAP
See Challenge Handshake Authentication Protocol.
CUDG:
Control Unit Diagnosis
D
DHCPv4
Dynamic Host Configuration Protocol version 4, allows a computer to
join an IP-based network without having a pre-configured IPv4
address. DHCPv4 is a protocol that assigns unique IP addresses to
devices, then releases and renews these addresses as devices leave
and re-join the network.
Duplex
The transmission of data in either one or two directions. Duplex modes
are full-duplex and half-duplex. Full-duplex is the simultaneous
transmission of data in two direction. For example, a telephone is a full-
duplex device, because both parties can talk at once. In contrast, a
walkie-talkie is a half-duplex device because only one party can
transmit at a time.
F
Fabric
The hardware that connects workstations and servers to storage
devices in a SAN. The SAN fabric enables any-server-to-any-storage
device connectivity through the use of Fibre Channel switching
technology.
Firmware
Software embedded into a storage device. It may also be referred to as
Microcode.
Flash memory
ROM that can be electrically erased and reprogrammed. A type of
EEPROM (Electrically Erasable and Programmable). It can retain
information without electricity and is widely used as an external
storage, etc.
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Hitachi AMS 2100/2300 Storage System Hardware Guide
M N M N O P Q R S T U V W X Y R S T Z
Glossary–3