Motorola SBG-940 User Guide - Page 131

layer, latency, loopback, L2F technology.

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L L2F L2TP LAC LAN layer LCP latency LED LNS loopback Overview Installation Troubleshooting Contact FAQ Specifications Glossary License Configuration: Basic Gateway TCP/IP Wireless USB Layer 2 Forwarding is an OSI layer 2 protocol that establishes a secure tunnel across the Internet to create a virtual PPP connection between the user and the enterprise network. L2F is the most established and stable layer 2 tunneling protocol. Layer 2 Tunnel Protocol is a PPP extension that enables ISPs to operate VPNs. L2TP merges the best features of the PPTP and L2F. L2TP is the emerging IETF standard. An L2TP access concentrator is a device to which the client directly connects through which PPP frames are tunneled to the LNS. The LAC need only implement the media over which L2TP operates to transmit traffic to one or more LNSs. The LAC may tunnel any protocol carried within PPP. The LAC initiates incoming calls and receives outgoing calls. A LAC is analogous to an L2F NAS. A local area network provides a full-time, high-bandwidth connection over a limited area, such as a building or campus. Ethernet is the most widely used LAN standard. In networks, layers are software protocol levels. Each layer performs functions for the layers above it. OSI is a reference model having seven functional layers. Link Control Protocol establishes, configures, and tests data link connections used by PPP. The time required for a signal to pass through a device. It is often expressed in a quantity of symbols. light-emitting diode An L2TP network server is a termination point for L2TP tunnels where PPP frames are processed and passed to higher layer protocols. An LNS can operate on any platform that terminates PPP. The LNS handles the server side of the L2TP protocol. L2TP relies only on the single media over which L2TP tunnels arrive. The LNS can have a single LAN or WAN interface but can terminate calls arriving at any of the LACs full range of PPP interfaces (asynchronous, synchronous, ISDN, V.120, etc.). The LNS initiates outgoing calls and receives incoming calls. An LNS is analogous to a home gateway in L2F technology. A test that loops the transmit signal to the receive signal. Usually the loopback test is initiated on a network device. The test is used to verify a path or to measure the quality of a signal on that path. SBG940 User Guide 123

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Overview
Installation
Troubleshooting
Contact
FAQ
Specifications
Glossary
License
Configuration:
Basic
Gateway
TCP/IP
Wireless
USB
SBG940 User Guide
123
L
L2F
Layer 2 Forwarding is an OSI layer 2 protocol that establishes a secure tunnel across the Internet to
create a virtual PPP connection between the user and the enterprise network. L2F is the most
established and stable layer 2 tunneling protocol.
L2TP
Layer 2 Tunnel Protocol is a PPP extension that enables ISPs to operate VPNs. L2TP merges the
best features of the PPTP and L2F. L2TP is the emerging IETF standard.
LAC
An L2TP access concentrator is a device to which the client directly connects through which PPP
frames are tunneled to the LNS. The LAC need only implement the media over which L2TP operates
to transmit traffic to one or more LNSs. The LAC may tunnel any protocol carried within PPP. The LAC
initiates incoming calls and receives outgoing calls. A LAC is analogous to an L2F NAS.
LAN
A local area network provides a full-time, high-bandwidth connection over a limited area, such as a
building or campus. Ethernet is the most widely used LAN standard.
layer
In networks, layers are software protocol levels. Each layer performs functions for the layers above it.
OSI is a reference model having seven functional layers.
LCP
Link Control Protocol establishes, configures, and tests data link connections used by PPP.
latency
The time required for a signal to pass through a device. It is often expressed in a quantity of symbols.
LED
light-emitting diode
LNS
An L2TP network server is a termination point for L2TP tunnels where PPP frames are processed and
passed to higher layer protocols. An LNS can operate on any platform that terminates PPP. The LNS
handles the server side of the L2TP protocol. L2TP relies only on the single media over which L2TP
tunnels arrive. The LNS can have a single LAN or WAN interface but can terminate calls arriving at
any of the LACs full range of PPP interfaces (asynchronous, synchronous, ISDN, V.120, etc.). The
LNS initiates outgoing calls and receives incoming calls. An LNS is analogous to a home gateway in
L2F technology.
loopback
A test that loops the transmit signal to the receive signal. Usually the loopback test is initiated on a
network device. The test is used to verify a path or to measure the quality of a signal on that path.