Glossary-26
QAM, quadrature amplitude modulation
A modulation technique that combines phase and amplitude modulation to
increase the number of bits per baud.
RA, access rate
The data rate, in bps of the frame relay link. The rates available are in
increments of 64 and 56 Kbps segments (64, 128, 192, etc. or 56, 112, 168,
etc.).
RAM, random access memory
A storage device into which data can be entered (written) and read; usually
(but not always) a volatile semiconductor memory.
RBOC, Regional Bell Operating Companies
The seven Regional Bell Operating Companies that are committed to
developing and offering a standardized nationwide frame relay service to
prevent the formation of public
frame relay islands
. Although this effort is
not completed, it is well on its way to being realized by the standardization of
the Network to Network Interface (NNI).
RD, receive data
An RS232 data signal received by the data terminal equipment (DTE) from
a data communications equipment (DCE).
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 unit.
remote composite loopback
A link loopback that forms the loop at the output (composite side) of the
remote unit.
remote digital loopback
A digital loopback that forms the loop at the input side of the remote modem.
remote terminal server (RTS)
An optional module for the Integration unit that provides remote access to an
Ethernet local area network (LAN) over a wide area network (WAN), as well
as from LAN to remote devices over the LAN.
