Configuring Virtual Circuits 145Adding VoiceCompression ModuleVCC CircuitsTo configure a VPC/VCC virtual circuit to connect data ports, follow these steps:You must configure at least one VCM VCC circuit before you can configure anyVCM subchannel circuits.1 When you are prompted to select the virtual circuit type, as shown earlier inFigure 105, enter 3 to create a VCM VCC circuit.A screen appears, listing the modules available to assign as side A of the virtualcircuit, as shown in Figure 108.Figure 115 Selecting a Slot for Side A of a VCM VCC Virtual Circuit2 Enter the number corresponding to the slot in which the Voice Compressionmodule is installed (7 or 8) to assign the VCM to side A of the circuit.The Add Virtual Circuit screen displays the selected slot number and port type, liststhe parameters you will enter for side A of the circuit, and prompts you to set thefirst parameter, as shown in Figure 116.3 Follow the prompts that appear at the bottom of the screen, pressing [Enter] aftereach entry. Default values are listed in square brackets ([ ]) at the end of eachprompt.Your settings are added to list of parameters at the top of the screen as you enterthem. You must enter a setting for all the parameters for which you are promptedin order to add a circuit. Press [Delete] to back up to a previous selection.CAUTION: For voice compression circuits, select the Shaper Numbercorresponding to the maximum shaper value (typically Shaper Number 15).Make sure that Early Packet Discard is disabled (set to no) for voice compressioncircuits.
