NetAtlas IES-1000 (AAM1008) EMS User’s Guide
The Configuration Menus
7-23
Table 7-16 Virtual Channel Configuration: New
LABEL DESCRIPTION
VC Profile
Select a profile name to associate to this virtual channel.
DEFVAL
DEFVAL
is the name of the default profile for LLC encapsulation.
DEFVAL_VC is the name of the default profile for VC encapsulation.
The following fields displays the settings in the virtual channel profile you select in the
VC
Profile
field.
Encapsulation This field displays the type of encapsulation (
LLC
or
VC
).
AAL Mode This field displays the mode of the ATM Adaptation Layer (AAL).
Traffic Class
This field displays the type of ATM traffic class:
cbr
(constant bit rate),
rt-vbr
(real-time
variable bit rate),
nrt-vbr
(non real-time variable bit rate),
ubr
(unspecified bit rate) or
abr
(available bit rate).
Peak Cell Rate This is the maximum rate at which the sender can send cells. Divide the DSL line rate (bps) by
424 (the size of an ATM cell) to find the Peak Cell Rate (PCR).
Cell Delay
Variation
Tolerance
This field displays the accepted tolerance of the difference between a cell’s transfer delay and
the expected transfer delay.
Minimum Cell
Rate
This option is available for
abr
traffic class.
This is the minimum rate at which the sender can send cells.
Burst Tolerance This option is available for
vbr
traffic class.
This field displays the maximum number of cells that the port is guaranteed to handle without
any discards.
OK Click
OK
to save the changes and close this screen.
Cancel Click
Cancel
to discard all changes and close this screen.
7.5.3
Changing Virtual Channel Settings
To modify the virtual channel settings, select an entry in the
Virtual Channel Configuration
screen and click
Modify
for information on the fields in the
Modify Virtual Channel Configuration
screen.