Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 188

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G-14 Encore Multi-port DSU/CSU User GuideÑJuly, 1997
G
RS-232-C
An EIA speciÞed physical interface, with associated electrical signaling,
between data circuit terminating equipment (DCE) and data terminating
equipment (DTE).
RS-449
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 ßow 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 Þgure 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.
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