HP auroraTempo, User Manual

Page: 277 / 300

Issue 1a - 10/99 A4 - 11
Appendix 4 - Glossary
RLOS
Alarm which indicates loss of framing synchronization.
Router
A device for connecting two or more LANS.
Routing
The function which ensures that the correct path through a
network is selected.
RS232
A standard type of serial connector.
RTC R
eal
T
ime
C
lock. A calendar clock that is powered from its
own battery and that continues to run even when aurora
Tempo
is switched off or the power is removed.
RTS/CTS R
equest
T
o
S
end /
C
lear
T
o
S
end. A type of flow control
where the RTS line is used by the Data Terminal Equipment
to indicate that it wishes to send data. The Data
Communications Equipment indicates it may send the data
by asserting CTS.
SELV S
afety
E
xtra
L
ow
V
oltage. A circuit which is protected from
hazardous voltages.
SF/D4 S
uperframe
F
ormat.
Signalling
The transmission of information which is related to
switching.
SLC96 S
ubscriber
L
ine
C
oncentrator - this is a framing type.
Stop bits
In asynchronous serial data transmission each character is
encapsulated between a start bit and one or more stop bits.
These bits define the end of one character and the start of
the next and trigger the line into an idle or active state.
SVC S
witched
V
irtual
C
ircuit. A virtual connection through the
network which can be set up and cleared down on a call by
call basis.
Switch
Frame Relay switches accept traffic from access