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McDATA UltraNet Edge 3000 User Guide
Configuring a 1x1 ATM Wide Area Network
If you enable Packet Over SONET (POS) for this ATM
interface, the Virtual Path ID (VPI) and Virtual Channel ID
(VCI) fields on this dialog box will be disabled, because the
ATM protocol does not use the VPI and VCI for POS.
d. Select the Quality of Service from the drop-down menu.
• CBR - (Constant Bit Rate)
• VBR - (Variable Bit Rate)
• UBR - (Unspecified Bit Rate)
NOTE: McDATA recommends using CBR for ATM implementations. The
best performance obtained during testing was with Constant Bit Rate (CBR).
e. Select either the 10
3
cells/sec or the 10
6
bits/sec cell rate.
•Select 10
3
cells/sec to enter the Peak Cell Rate and
Sustained Cell Rate values in Kcells per second.
•Select 10
6
bits/sec to enter the Peak Cell Rate and Sustained
Cell Rate values in Mbps per second.
Switching between the 10
3
cells/sec and 10
6
bits/sec buttons
will toggle the entered values between the Kcells per second
and Mbps per second formats. The 10
3
cells/sec option is the
default selection, so when you reopen the dialog box, the 10
3
cells/sec option will be selected.
f. Enter the Peak Cell Rate in this field.
1 through 135000 bits/sec (1-352 cells/sec) are valid enabled
values. The default value for the ATM OC-3 interface is 135000
bits/sec (352 cells/sec). The default value for the ATM OC-12
interface is 542000 bits/sec (1411 cells/second).
If POS is enabled, the default value for the OC-3 interface is
150000 bits/sec (391 cells/sec) and the default value for the
OC-12 interface is 600000 bits/sec (1563 cells/sec).
g. Enter the Sustained Cell Rate in this field.
NOTE: The Sustained Cell Rate value cannot exceed the Peak Cell Rate
specified in the Peak Cell Rate field.
This is the average rate for which the permanent virtual circuit
contracts. The aggregate of all SCRs for a particular interface
cannot exceed the line rate. 1 through 135000 bits/sec (1-352