Ripwave Base Station I&C Guide
Navini Networks, Inc.
16
Part #40-00047-00 Rev D v1.0
February 28, 2003
Term
Stands For....
Meaning
TDD
Time Division Duplex
A digital transmission method that combines signals from
multiple sources and allows a single channel to alternately carry
data in each direction of a link.
TFFS
True Flash File System
Memory in a computing device that does not lose its information
when powered off. Available as a SIMM or PCMCIA card, it
usually stores router Operating System (OS) software. Can be
easily updated.
TTL
Time-to-live
A field in the Internet Protocol that specifies how many more
hops a packet can travel before being discarded or returned.
Tx
Transmit
To send by wire or other medium electronically or through air
via electromagnetic waves to a receiving communications device.
UL
UpLink
Describes the direction of signal flow being sent from a
subscriber to a network system, as in from a mobile device (CPE)
to a base station.
USB
Universal Serial Bus
An external bus standard for plug-and-play interfaces between a
computer and add-on devices, such as a mouse, modem,
keyboard, etc. One USB port can connect up to 127 devices.
VCC
Virtual Channel Circuit
AKA, Virtual Channel Connection or Virtual Circuit Connection.
A logical circuit made up of Virtual Channel Links, which carry
data between two end points in an ATM network.
VCI
Virtual Channel Identifier
A 16-bit value in the ATM cell header that provides a unique
identifier for the Virtual Channel that carries that particular cell.
VCL
Virtual Channel Link
A connection between two ATM devices.
Vector
Vector
A quantity representative of both magnitude and direction
( orientation in space)
VPC
Virtual Private Channel
AKA, Virtual Path Connection. A grouping of Virtual Channel
Connectors, which share one or more contiguous VPL’s.
VP
Virtual Path
A set of Virtual Channels grouped together between cross-points
(i.e., switches).
VPI
Virtual Path Identifier
An 8-bit value in the cell header that identifies the VP as well as
the VC to which the cell belongs. The VPI + VCI identify the
next destination of a cell as it passes through a series of ATM
switches.
VPL
Virtual Path Link
A group of unidirectional VCL’s with the same end points in a
Virtual Path. Grouping VCL’s into VPL’s reduces the number of
connections to be managed. One or more VPL’s makes up a
VPC.
WAN
1
Wide Area Network or
2
Wireless Access Network
1
A communications network that spans geographically separate
areas and which provide long-haul services. Examples of inter-
networked connections are frame relay, SMDS, and X.25
protocols.
2
General term for any product primarily used to gain
access to the Internet, as opposed to being part of the actual
Internet devices or software.