User guide

Glossary G-15
G
R
RD (Receive Data)
A data port signal.
receiver
The receiver synchronizes the framing pattern, separates the frame bits from
the payload data and monitors for frame errors in 64 kbps mode. It achieves
frame synchronization within 5 milliseconds.
repeater
Equipment that receives a pulse train, ampliÞes it, retimes it, and then
reconstructs the signal for retransmission.
return to zero
Method of transmitting binary information such that, after each encode bit,
voltage returns to the zero level.
RI (Ring Indicator)
A data port signal.
RJ48S
An 8-position keyed jack used to connect services that are covered under FCC
Part 68 Rules, such as public switched digital service (PSDS), switched 56, 19.2
Kbps service, 64 Kbps service, and synchronous digital data with secondary
channel.
RLSD
Receive Line Signal Detect, a data port signal
RS232
A TIA/EIA standard for serial transmission.
RS232-C
An EIA speciÞed 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 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.