Siemens RM400 C Series Operating Manual page 201

twisted-pair
Twisted-pair (also known as 10baseT, the T standing for twisted-pair) is a low-
cost Ethernet variant, the distinguishing feature being that the cable segments
cover even shorter distances than those covered by thin Ethernet. Twisted-pair
cabling uses separately insulated strands of wire twisted together as its trans-
mission medium.
uninterruptible power supply (UPS)
A device connected between the system and the power source to guarantee a
steady supply of electricity to the system. It largely protects the system against
loss of power (blackouts), power dips and power surges.
V.24 interface
The V.24 interface is a serial interface for the functions and electrical properties
of the lines connecting data terminal equipment and data communications
equipment. CCITT Recommendation V.28 contains specifications for the
electrical values of the interface line.
wide area network (WAN)
A network with a greater range than a LAN. A WAN generally extends beyond
a single set of premises and runs on facilities provided by the local telecommu-
nications authority.
WORM
Like the CD-ROM and the rewritable optical disc, the WORM (Write Once Read
Many) disc is an optical storage medium (an MO or magneto-optical disc).
Unlike a ROD, though, a WORM disc can only be written once.
X.21 interface
CCITT (Comité Consultatif International Télégraphique et Téléphonique)
recommendation for interfaces between data terminal equipment and data
circuit-terminating equipment for synchronous procedures in public data
networks.
U24802-J-Z146-2-7600 RM400 C Models
Glossary
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