Motorola SBG-940 User Guide - Page 135

port mirroring, port triggering, private IP, address, protocol, provisioning, public IP

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Overview Installation Troubleshooting Contact FAQ Specifications Glossary License Configuration: Basic Gateway TCP/IP Wireless USB port mirroring port triggering PPP PPTP private IP address protocol provisioning PSTN public IP address A feature that enables one port (source) on the SBG940 to be copied to another port (destination) to be studied. The destination mirrors the transmitted (from) or received (to) data on the source port to enable the person managing the network to monitor activity. A mechanism that allows incoming communication with specified applications. Primarily used for gaming applications. Point-to-Point Protocol is used to transport other protocols, typically for simple links over serial lines. It is most commonly used to access the Internet with a dial-up modem. Point-to-Point Tunneling Protocol encapsulates other protocols. It is a new technology to create VPNs developed jointly by several vendors. An IP address assigned to a computer on the SBG940 LAN by the DHCP server on the SBG940 for a specified lease time. Private IP addresses are used by the SBG940 LAN only; they are invisible to devices on the Internet. See also public IP address. A formal set of rules and conventions for exchanging data. Different computer types (for example PC, UNIX, or mainframe) can communicate if they support common protocols. The process of autodiscovery or manually configuring a cable modem on the CMTS. The public switched telephone network is the traditional circuit-switched, voice-oriented telephone network. See also POTS. The IP address assigned to the SBG940 by the cable provider. A public IP address is visible to devices on the Internet. See also private IP address. Q QAM QPSK QoS Quadrature Amplitude Modulation uses amplitude and phase modulation to encode multiple bits of data in one signaling element. QAM achieves faster data transfer than amplitude or phase modulation alone, but the signal is more prone to errors caused by noise. QAM requires a transmission circuit with a higher CNR than alternate modulation formats such as QPSK. Two types of QAM are: • 16 QAM encodes four bits per symbol as one of 16 possible amplitude and phase combinations. • 64 QAM encodes six bits per symbol as one of 64 possible amplitude and phase combinations. Quadrature Phase Shift Key (QPSK) modulation sends two bits of information per symbol period with one symbol 90 degrees out of phase with other symbols. The four constellation points represented by the coordinates (0,0 - 0,1 - 1,0 - 1,1) represent the four possible combinations. Quality of service describes the priority, delay, throughput, and bandwidth of a connection. SBG940 User Guide 127

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Overview
Installation
Troubleshooting
Contact
FAQ
Specifications
Glossary
License
Configuration:
Basic
Gateway
TCP/IP
Wireless
USB
SBG940 User Guide
127
Q
port mirroring
A feature that enables one port (source) on the SBG940 to be copied to another port (destination) to
be studied. The destination mirrors the transmitted (from) or received (to) data on the source port to
enable the person managing the network to monitor activity.
port triggering
A mechanism that allows incoming communication with specified applications. Primarily used for
gaming applications.
PPP
Point-to-Point Protocol is used to transport other protocols, typically for simple links over serial lines. It
is most commonly used to access the Internet with a dial-up modem.
PPTP
Point-to-Point Tunneling Protocol encapsulates other protocols. It is a new technology to create VPNs
developed jointly by several vendors.
private IP
address
An IP address assigned to a computer on the SBG940 LAN by the DHCP server on the SBG940 for a
specified lease time. Private IP addresses are used by the SBG940 LAN only; they are invisible to
devices on the Internet. See also
public IP address
.
protocol
A formal set of rules and conventions for exchanging data. Different computer types (for example PC,
UNIX, or mainframe) can communicate if they support common protocols.
provisioning
The process of autodiscovery or manually configuring a cable modem on the CMTS.
PSTN
The public switched telephone network is the traditional circuit-switched, voice-oriented telephone
network. See also
POTS
.
public IP
address
The IP address assigned to the SBG940 by the cable provider. A public IP address is visible to
devices on the Internet. See also
private IP address
.
QAM
Quadrature Amplitude Modulation uses amplitude and phase modulation to encode multiple bits of
data in one signaling element. QAM achieves faster data transfer than amplitude or phase modulation
alone, but the signal is more prone to errors caused by noise. QAM requires a transmission circuit with
a higher CNR than alternate modulation formats such as QPSK. Two types of QAM are:
•
16 QAM encodes four bits per symbol as one of 16 possible amplitude and phase combinations.
•
64 QAM encodes six bits per symbol as one of 64 possible amplitude and phase combinations.
QPSK
Quadrature Phase Shift Key (QPSK) modulation sends two bits of information per symbol period with
one symbol 90 degrees out of phase with other symbols. The four constellation points represented by
the coordinates (0,0 – 0,1 – 1,0 – 1,1) represent the four possible combinations.
QoS
Quality of service describes the priority, delay, throughput, and bandwidth of a connection.