User`s guide

Conﬁguring ATM Connections

3-4

Adding a Permanent Virtual Circuit

To conÞgure a new Permanent Virtual Circuit (PVC), enter the following

information in the Þelds which appear just below the Settings list box:

1. From the I/F menu, select the interface for which you wish to conﬁgure a

connection. All available ATM interfaces will be listed in this menu. The I/F

menu will display 21 if an ATM SSIM is installed in the left hand slot and/or 25

if an ATM SSIM is installed in the right hand slot of the switch.

2. In the VPI text box, enter the Virtual Path Identiﬁer you wish to assign to this

connection. Allowable values are 0 to 3. The VPI you assign will be used to

group virtual connections, allowing for channel trunking between ATM

switches.

3. In the VCI text box, enter the Virtual Channel Identiﬁer you wish to assign to

this connection. Allowable values are 0 to 1023

for each VPI

. For example,

you could assign the same channel identiﬁer as many as four times: once with

a VPI of 0, once with a VPI of 1, and so on. Remember that it is the

combination of VPI and VCI that will be used to direct cells through the

intermediate switches between the source and destination.

4. From the Encapsulation Type menu, select the desired encapsulation type;

the STS16-20 uses VC MUX 802.5 LANE as the encapsulation method.

5. Click on the Add button; the parameters for the new Permanent Virtual Circuit

will be added to the Settings list box.

The circuit is automatically enabled, and will remain in place until it is manually

deleted.

Deleting a Permanent Virtual Circuit

Permanent Virtual Circuits remain in place until they are manually removed

using the Current ATM Connections window.

To delete an existing PVC:

1. In the Settings list box, click to select the Permanent Virtual Circuit you wish

to delete. The selected PVC will be highlighted blue.

2. Click on the Delete button. A conﬁrmation window will appear, listing the

parameters assigned to the connection and asking you to verify the action.

3. Click OK to proceed with the deletion; the selected PVC will be deleted.