G-12 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001
G
RS232-C
An EIA specified physical interface, with associated electrical signaling,
between data circuit terminating equipment (DCE) and data terminating
equipment (DTE).
RS449
A common 37-position interface for data terminal equipment and data circuit
terminating equipment employing serial binary data interchange. It is a
balanced interface, based on unipolar digital signals, depending more on
current flow than voltage, therefore supports greater distances than the RS-232
interface.
RTS(Request to Send)
A signal sent by DTE to DSU/CSU indicating DTE has data ready to transmit.
S
SCR (Serial Clock Receive)
A unipolar clock from the DCE signal. A data port signal.
SCT (Serial Clock Transmit)
A unipolar clock from the DCE signal. A data port signal.
SCTE (Serial Clock Transmit External)
The clock signal is echoed from the DTE for the purpose of timing incoming
data on long cable runs.
scrambler
A device or software program that encodes data for encryption. It distorts a
voice or data conversation so that only another like device can figure out the
content of the message.
SD (Send Data)
A signal from DTE to DSU/CSU.
secondary channel
A subchannel derived from the main channel. It does not carry data messages
and is used for diagnostic or supervisory purposes.
serial transmission
A sequential transmission of bits constituting an entity of data over a data
circuit.
SES (Severely Errored Second)
A second during wh ich 320 or more CRC violation s or OOF events have
occurred (ESF framing only).