Installation guide

Glossary
GL-22
Cisco 6260 Hardware Installation Guide
OL-2365-02
permanent virtual
path
See PVP.
physical port
A physical connection to a computer through which data flows. An Ethernet port, for example, is the
point at which the Ethernet network cabling plugs into a computer.
plain old telephone
service
See POTS.
Point-to-Point
Protocol
See PPP.
port
An interface on an internetworking device (such as a DSLAM).
POTS
plain old telephone service. General term referring to the variety of telephone networks and services
in place worldwide.
POTS splitter
A device that enables both a DSL data device and a standard analog device to share the same ADSL
or IDSL line.
power entry module
See PEM.
PPP
Point-to-Point Protocol. The successor to SLIP that provides router-to-router and host-to-network
connections over both synchronous and asynchronous circuits. See SLIP.
protocol
A formal description of messages to be exchanged and rules to be followed so that two or more
systems can exchange information.
pulse amplitude
modulation
See PAM.
PVC
permanent virtual circuit (or connection). A virtual circuit that is permanently established. PVCs save
bandwidth associated with circuit establishment and tear down in situations where certain virtual
circuits must exist all the time. Compare with SVC. See also virtual circuit.
PVP
permanent virtual path. A virtual path that consists of PVCs. See also PVC and virtual path.
Q
QoS
quality of service. A measure of performance for a transmission system that reflects its transmission
quality and service availability.
quad-port flexi
ATU-C line card
See 4xflexi.
quad-port STU-C
line card
See 4xSDSL.
quality of service
See QoS.