Siemens RM400 C Series, Operating Manual

Page: 198 / 227

188
RM400 C Models U24802-J-Z146-2-7600
Glossary
high availability
High system availability means that errors/faults which can lead to breaks in
system operation are avoided or are bypassed by the system using automati-
cally initiated procedures
. A system configuration, for example, comprising two
or more systems using one or more shared peripherals cabinets could be
described as having high availability. If one of the systems fails, operation
continues with the same data on the other system. This minimizes downtimes
for the entire system, thus providing high availability.
Institute of Electrical and Electronics Engineers (IEEE)
An organization responsible for setting electrical and electronics standards.
IHSS multipoint controller
The IHSS multipoint controller allows up to four terminals to be connected to
an IHSS line (approx. 2000 m cable length). The maximum
synchronous data
transmission
speed is 64 Kbits per second. An HDLC (High-Level Data Link
Control) protocol safeguards data transmission
inhouse interface (IHSS)
This is an interface in a local network which allows
peripherals
to be connected
via standard telephone lines.
jukebox
A jukebox, also known as a disk or tape changer, is a device which holds more
than one volume of a storage medium and can switch between the volumes
under software control, thereby virtually multiplying the capacity of a storage
medium. Jukeboxes for
ROD
and 8 mm
cartridge
are available for the RM200.
local area network (LAN)
A LAN is a local communications network linking systems, not necessarily all
of the same type, which are within a limited area and use shared resources.
modem
A modem (short for modulator/demodulator) is a communications device which
converts data signals from digital to analog and vice versa. It allows data
signals to be sent on communications channels which do not carry d.c. signals.
In public telecommunication networks, modems are provided by the PTT and
mark the limit of the PTT’s area of responsibility to the user. Modems have
internationally standardized interfaces for the connection of data terminal
equipment.