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Remote Gateway 9150 Installation and Administration Guide 503
January 2005 Glossary
SPRE code
A Special Prefix code that is used to initiate use of a PBX feature. In a Remote
Gateway 9100 Series context, SPRE codes are used to
! toggle a remote site between online and offline modes
! use the paging feature
! switch an analog or ATA-equipped station from host-controlled mode to
locally controlled mode so that local calls can be made
! register a Remote Gateway 9150 unit for a multi-user or dynamic port
station
A telephone or fax machine located at a Remote Gateway 9150 site.
stop bit
In asynchronous communications, a bit that indicates a byte has just been
transmitted. Every byte of data is preceded by a start bit and followed by a stop
bit.
subnet mask
A subnet mask is the part of the IP address used to represent a subnetwork
within a network. A typical IP address might be 192.210.34.144. Each part of
this address is made up of eight bits. The subnet mask identifies to the RLC or
remote unit what portion of the IP address represents the network (and
subnetwork) and what portion represents the host.
switch
In a telecommunications network, a switch is the hardware that receives phone
calls and provides connections to telephone sets. The switch allows a connection
to be established as necessary and terminated when there is no longer a session
to support it.
In data networks, a switch is a device that filters and forwards packets between
LAN segments. Switches operate at the data link layer (layer 2) of the OSI
Reference Model and, therefore, support any packet protocol. LANs that use
switches to join segments are called switched LANs or, in the case of Ethernet
networks, switched Ethernet LANs.