MCK pbxgateway Administrator's Manual page 236

Glossary
R
Remote Unit
The device that connects to the remote telephones and communicates
with the PBXgateway at the Corporate facility.
RJ-11
A six conductor modular jack that is typically wired for four conductors. It
is the most common jack used for connecting telephones, modems and
fax machines.
RJ-21
A 25-pair connector used for connecting the PBXgateway to the PBX.
Router
A device used to forward packets from one or more Network Numbers, to
the intended destinations.
RS-232
9 or 25 Position Non-Synchronous Interface Between Data Terminal
Equipment and Data Circuit-Terminating Equipment Employing Serial
Binary Data Interchange (ANS/EIA/TIA-574-90)
RS-530
Physically it is the same as an RS-232 cable, except the RS-530 cable is
designed for devices that transmit at higher speeds.
RTP
Real Time Protocol. A protocol designed to address problems caused
when real-time exchanges, such as voice are transported over LANs
designed for data.
RVP   
Remote Voice Protocol. MCK Communications proprietary packet
encapsulation protocol.
Issue 2.1 December 1999
8-10