Switch User's Guide

Glossary
252 CSX400 and CSX400-DC User’s Guide
Data Compression — Techniques used to reduce the number of bits transferred across the
communication links that represent the actual data bits. Compression is used to optimize use of
WAN links and speed data transmission.
DHCP — Dynamic Host Configuration Protocol is a protocol for automatic TCP/IP configuration
that provides static and dynamic address allocation and management.
Dial on Demand — Dial up WAN resources are accessed only when remote access is required
and released as soon as the resource is no longer needed.
DTE — Data Terminating Equipment. DTE refers to equipment used in a network as the data
source and/or destination, such as computers.
DTMF — Dual Tone Multi-Frequency. TOUCHTONE as opposed to Dial Pulse (DP).
DTR — Data Terminal Ready. RS232 signal used for indicating to the DCE the readiness to
transmit and receive data.
EtherTalk — AppleTalk protocols running on Ethernet.
Filter — Feature to control the flow of data based on protocol or bridge information. Filters can
be specific to allow data through or prevent transmission.
Firewall — A combination of techniques used to protect one network from unknown networks
and users on the outside. Firewalls can filter or block traffic and act as a management and network
security point where all traffic can be scrutinized.
Frame — A group of data generated by Data Link Layer operation.
HDSL — High bit rate Digital Subscriber Line. A technology to put two-way T1 on a normal
unshielded, bridged (but not loaded) twisted pair without using repeaters.
IMUX (Inverse Multiplexing) — The process of splitting a single high-speed channel into
multiple signals, transmitting the multiple signals over multiple facilities operating at a lower rate
than the original signal, and then recombining the separately-transmitted portions into the original
signal at the original rate.
In-Band Signaling — Transmission within the frequency range used for data transmission; i.e.,
results in use of bandwidth normally reserved for data.