User`s guide

G-8 DL600E E1 Data Multiplexer UserÕs Guide
repeaterÑEquipment that receives a pulse train, ampliÞes it, retimes it, and
then reconstructs the signal for retransmission.
return to zeroÑMethod of transmitting binary information such that, after
each encode bit, voltage returns to the zero level.
RI (Ring Indicator)ÑA data port signal.
RJ48SÑAn 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.
RLSDÑReceive Line Signal Detect, a data port signal
RS232 Ñ A TIA/EIA standard for serial transmission between computers and
peripheral devices (modem, mouse, an so on.). It uses a 25-pin
DB25 or 9-pin
DC9 connector. Its normal cable limitation of 50 feet can be extended to sev-
eral hundred feet with high-quality cable. RS232 deÞnes the purpose and sig-
nal timing for each of the 25 lines; however, many applications use less than a
dozen. RS232 transmits positive voltage for a 0 bit, negative voltage for a 1.
RS232-CÑAn EIA speciÞed physical interface, with associated electrical sig-
naling, between data circuit terminating equipment
(DCE) and data terminat-
ing equipment
(DTE).
RS449ÑA common 37-position interface for data terminal equipment and
data circuit terminating equipment employing serial binary data interchange. A
balanced interface, based on unipolar digital signals, depending more on cur-
rent ßow than voltage, therefore supports greater distances
RS232.
RTS(Request to Send)ÑA signal sent by DTE to DSU/CSU indicating DTE has
data ready to transmit.
S
SCR (Serial Clock Receive)ÑA unipolar clock from the DCE signal. A data
port signal.
SCT (Serial Clock Transmit)ÑA unipolar clock from the DCE signal. A data
port signal.
SCTE (Serial Clock Transmit External)ÑThe clock signal is echoed from
the DTE for the purpose of timing incoming data on long cable runs.