C
HAPTER
5
| WAN Configuration
ATM Settings
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The following items are displayed on this page:
CURRENT ATM VC
TABLE
The Current ATM VC Table lists the current ATM settings configured on your
ADSL Router. By selecting the connection using the radio button associated
with it you may edit the connection parameters which are listed below.
◆Select — Clicking the radio button associated with the connection
makes the parameters editable.
◆VPI (Virtual Path Identifier) — Adds a VPI entry to the table. (Range:
0-255; Default: 0)
◆VCI (Virtual Channel Identifier) — Adds a VCI entry to the table.
(Range: 32-65535; Default: 35)
◆QoS — Selects packet level Quality of Service (QoS) for the connection.
Options are:
■UBR (Unspecified Bitrate): Configures a PVC with a Peak Cell Rate
indicating the maximum number of ATM cells that can be sent in a
burst.
■CBR (Constant Bitrate): Configures a PVC at a constant bit rate.
This option may be required for connections that depend on precise
clocking to ensure undistorted delivery.
■nrt-VBR (non-realtime Variable Bitrate): Configures a PVC at a
non-realtime variable bit rate. This option may be used for
applications not sensitive to changes in available bandwidth, such
as data.
■rt-VBR (realtime Variable Bitrate): Configures a PVC at a real-time
variable bit rate. This option may be used for applications that have
a lot of variance in required bandwidth, such as voice.
◆PCR (Peak Cell Rate) — Configures the maximum allowable rate at
which cells can be transported along a connection in the ATM network.
The PCR is the determining factor in how often cells are sent in relation
to time in an effort to minimize jitter.
◆CDVT (Cell Delay Variation Tolerance) — Configures the maximum
amount of jitter permissable.
◆SCR (Sustainable Cell Rate) — Configures the average allowable, long-
term cell transfer rate on a specific connection.
◆MBS (Maximum Burst Size) — Configures the maximum allowable
burst size of cells that can be transmitted contiguously on a particular
connection.
◆Apply Changes — Applies the changes made to the connection.