![background image](http://html1.mh-extra.com/html/zyxel-communications/alc1224/alc1224_user-manual_945537061.webp)
ALC1224 User’s Guide
Virtual Channel Management
4-3
Table 4-1 ADSL Port Channel Setup
LABEL DESCRIPTION
VPI/VCI
This field displays the Virtual Path Identifier (VPI) and Virtual Circuit Identifier (VCI). The
VPI and VCI identify a channel on this port.
Click a link in the
VPI/VCI
column to open a screen where you can edit the VPI/VCI
settings.
Active
This field shows whether the channel is turned on (
Yes
) or not (
No
).
PVID
This is the PVID (Port VLAN ID) assigned to untagged frames or priority frames (0 VID)
received on this channel. An asterisk (*) denotes a super channel.
Priority
Type the priority value (0 to 7) to add to incoming frames without a (IEEE 802.1p) priority
tag. An asterisk (*) denotes a super channel.
VC Profile
This shows which VC profile the channel is set to use.
Add
Click this button to configure a new channel.
Delete
Select a channel’s
Delete
check box and click the
Delete
button to remove the channel.
4.3 ATM QoS
ATM Quality of Service (QoS) mechanisms provide the best service on a per-flow guarantee. ATM network
infrastructure was designed to provide QoS. It uses fixed cell sizes and built-in traffic management (see the
following section on traffic shaping). This allows you to fine-tune the levels of services on the priority of the traffic
flow.
4.4 Traffic Shaping
Traffic shaping is an agreement between the carrier and the subscriber to regulate the average rate and fluctuations
of data transmission over an ATM network. This agreement helps eliminate congestion, which is important for
transmission of real time data such as audio and video connections.
4.4.1 ATM
Traffic
Classes
These are the basic ATM traffic classes defined by the ATM Forum Traffic Management 4.0 Specification.
Constant Bit Rate (CBR)
Constant Bit Rate (CBR) is an ATM traffic class that provides fixed bandwidth. CBR traffic is generally time-
sensitive (doesn’t tolerate delay). CBR is used for connections that continuously require a specific amount of
bandwidth. Examples of connections that need CBR would be high-resolution video and voice.
Summary of Contents for ALC1224
Page 1: ...ALC1224 ADSL Line Card Version 3 50 LK 0 LV 0 August 2004 User s Guide...
Page 6: ......
Page 16: ......
Page 18: ......
Page 30: ......
Page 32: ......
Page 38: ...ALC1224 User s Guide 2 6 Web Configurator Introduction Figure 2 6 ALC Edit Port Setup...
Page 68: ...ALC1224 User s Guide 4 10 Virtual Channel Management...
Page 70: ......
Page 76: ......
Page 86: ......
Page 94: ......
Page 96: ......
Page 128: ......
Page 129: ...Index V Part V Index This part provides an index of important terms...
Page 130: ......
Page 136: ...ALC1224 User s Guide F Index X XMODEM upload 9 2...