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5536 PRI RAS Communications Controller Users Guide 213
RBOC (Regional Bell Operating Company) There are seven
regional telephone companies created by the AT& T divestiture:
Nynex, Bell Atlantic, Bell South, Southwestern Bell, US West, Pacific
Telesis and Ameritech.
RD (Received Data) RS-232 (V.24) data signal, sent from the data
communications equipment to the data terminal equipment on pin 3.
See RS-232.)
REN (Ringer Equivalence Number) A standard requirement of the
FCC. For devices such as a telephone or answering machine. The REN
requirement can be found on a label on the bottom of the analog
device.
Repeater Device that acts as an amplifier. Also known as a Line
Extender. This device is needed when the distance between the phone
company's Central Office and your premises exceeds distance or dB
loss limits.
RFC (Request for Comment) IETF documents that contain pro-
posed standards and specifications. RFCs can be either approved, or
simply archived as historical recommendations.
RI (Ring Indicator) RS-232 (V.24) control signal, sent from the data
communications equipment to the data terminal equipment on pin 22.
Indicates an incoming call is present. (See RS-232.)
RIP (Routing Information Protocol) Within IP networks, RIP is an
interior gateway protocol used by routers and host systems to exchange
information about reachable networks. RIP uses a distance-vectoring
algorithm to establish and maintain network routes.
RJ-45 Standard 8-wire connector for IEEE 802.3 networks and
some telephone applications.
Router Hardware device that connects two or more networks. A
router determines where the destination computer is located, and then
finds the best way to get there.
Routing Selecting the path to be taken by packets as they traverse
the network.
Routing tables Stored in voice/data switches or routers to deter-
mine which of several possible paths will be taken through the net-
work.