ZyXEL Communications Prestige 782R, User Manual, Page: 156 / 166

Prestige 782R G.SHDSL Router
Glossary I
Task Force) RFC-1661 through 1663. PPP provides router-to-router, host-to-router,
and host-to-host connections.
Promiscuous
Packet Capture Actively capturing packet information from a network. Most computers only collect
packets specifically addressed to them. Promiscuous packet capture acquires all
network traffic it can regardless of where the packets are addressed.
Protocol A “language” for communicating on a network. Protocols are sets of standards or rules
used to define, format and transmit data across a network. There are many different
protocols used on networks. For example, most web pages are transmitted using the
HTTP protocol.
Protocol Filters Your Prestige uses Protocol Filters to decide whether or not to allow passage of a data
packet and/or to make a call. Protocol filters act on IP/IPX packets and can serve as a
limited firewall.
Proxy Server A server that performs network operations in lieu of other systems on the network.
Proxy Servers are most often used as part of a firewall to mask the identity of users
inside a corporate network yet still provide access to the Internet. When a user
connects to a proxy server, via a web browser or other networked application, he
submits commands to the proxy server. The server then submits those same
commands to the Internet, yet without revealing any information about the system that
originally requested the information. Proxy servers are an ideal way to also have all
users on a corporate network channel through one point for all external
communications. Proxy servers can be configured to block certain kinds of
connections and stop some hacks.
PSTN Public Switched Telephone Network was put into place many years ago as a voice
telephone call-switching system. The system transmits voice calls as analog signals
across copper twisted cables from homes and businesses to neighborhood COs
(central offices); this is often called the local loop. The PSTN is a circuit-switched
system, meaning that an end-to-end private circuit is established between caller and
callee.
PVC Permanent Virtual Circuit. A PVC is a logical point-to-point circuit between customer
sites. PVCs are low-delay circuits because routing decisions do not need to be made
along the way. Permanent means that the circuit is preprogrammed by the carrier as a
path through the network. It does not need to be set up or torn down for each session.
ras This is the name of the firmware on the Prestige. Renaming may be necessary when
uploading new firmware to the Prestige.
RBOC Regional Bell Operating Company. There are currently seven regional telephone
companies that were created by the AT&T divestiture.
RFC A Request for Comments is an Internet formal document or standard that is the result
of committee drafting and subsequent review by interested parties. Some RFCs are
informational in nature. Of those that are intended to become Internet standards, the