Westermo ID-90 - Manual (Page 118)

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R,S,T,U
Reference points according to the ISDN user-network interface reference configuration
model.
RD
Received Data. The Data going from DCE to DTE.
R-Interface
Interface between the TA and TE2.
RJ-45
8-pole modular jack according to ISO Standard 8877.
RTS
Request to Send. Hardware handshake generated by the DTE to determine if the DCE is
ready to receive data. Expected response is from the CTS line.
SAPI
Service Access Point Identifier.
Simplex
Unidirectional communication.
S-Interface
2B+D 192kbit/s 4-wire full duplex. The S-interface is capable of handling 8 TE connec-
tions to the NT with three concurrent open channels. An “common telephone” uses one
channel alone while other packet switched equipment could share channels.
Max wire length 1 km at one TE and max 200 m with 8 TE.
SLIP
Serial line IP, Layer 1 protocol specialized to carry IP-frames.
SPB
Short Passive Bus.
Start bit
Marks the start of a transmission. In asynchronous transmission each character is preceded
by a start bit.
Stop bit
One or more stop bits mean that the character has been transmitted. Systems that use two
stop bits can cause problems with some modems as the modem will remove the second
stop bit to gain better data throughput and then not put it back.
SUB
Subaddressing.