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Multiserver 5000
260
point-to-point — A communications circuit or
transmission path connecting two points. In the
Multiserver unit that connection can be force-
connected (dedicated point-to-point) or
switched (switched point-to-point).
port — A physical connector on the back of the
Multiserver unit. It can be configured as a link,
or as a user channel. Also, an interface capable
of attaching to a device for communications
with another device.
protocol — The means used to control the orderly
exchange of information between stations of a
data link or on a data communications network
or system.
PTT, Post, Telephone, and Telegraph
Authority — A government agency that
functions as the communications common
carrier and administrator in many areas of the
world.
pulse dialing — Method used for call addressing in
rotary telephones by short pulses of on-
hook/off-hook. Also known as decadic pulsing
in Europe.
QAM, quadrature amplitude modulation — A
modulation technique that combines phase and
amplitude modulation to increase the number
of bits per baud.
RAM, random access memory — A storage device
into which data can be entered (written) and
read; usually (but not always) a volatile
semiconductor memory.
Rapid Relay technology — Four technologies (data
compression, speech compression, Fast-Packet
multiplexing, and automatic fax demodulation)
combined and used in Multiserver products.
RD, received data — An RS-232 data signal received
by the DTE from a DCE.
receive inhibit — A configuration option that
prevents the voice/fax channel from receiving
calls.
remote analog loopback — An analog loopback that
forms the loop at the line (analog output) side
of the remote modem.
remote channel loopback — A channel loopback
that forms the loop at the input (channel side)
of the remote multiplexor.
remote composite loopback — A link loopback that
forms the loop at the output (composite side)
of the remote multiplexor.
remote digital loopback — A digital loopback that
forms the loop at the input side of the remote
modem.
reorder — In a switching mode, the response to
most unsuccessful call attempts.
repeated ring — A configuration option for a KTS-
strapped voice/fax channel. When repeated
ring is configured, the local voice/fax channel
rings the attached telephone set in response to
a remote PBX ringing signal.
ringdown — Causes the local telephone to ring
when the remote telephone is lifted off-hook,
and vice versa.
RI, ring indicator — An RS-232 interface signal,
sent from the modem to the DTE, that indicates
that an incoming call is present.
RJ-type connector — A modular connector that
complies with certain telco standards.
ROM, read-only memory — A nonvolatile
semiconductor storage device manufactured
with predefined contents.
RS-232 — An EIA-recommended standard that is
the most common for connecting serial data-
processing devices. RS-232 specifies the
electrical characteristics of the signals in cables
that connect a DTE to a DCE. An RS-232
standard is functionally identical to CCITT
V.24/V.28.