McDATA manual McDATA UltraNet Edge 3000 User Guide

7

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 103 cells/sec or the 106 bits/sec cell rate.

•Select 103 cells/sec to enter the Peak Cell Rate and Sustained Cell Rate values in Kcells per second.

•Select 106 bits/sec to enter the Peak Cell Rate and Sustained Cell Rate values in Mbps per second.

Switching between the 103 cells/sec and 106 bits/sec buttons will toggle the entered values between the Kcells per second and Mbps per second formats. The 103 cells/sec option is the default selection, so when you reopen the dialog box, the 103 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

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