3com S330 Manuale Utente

To configure the VCM card, follow these steps:

1 From the VCM Configuration menu, shown earlier in Figure 100, select [3] Card 

Configuration to open the VCM Card Configuration menu. This menu lists 
information about the VCM card and allows you to set the card’s administrative 
status. Figure 102 shows a representative VCM Card Configuration menu.

Figure 102   VCM Card Configuration Menu

2 Select [1] Set Admin Status and put the VCM card In Service or Out of Service.

Once you have configured the PathBuilder S330/S310’s modules and ports, you 
can start setting up virtual circuits. A virtual circuit is a bi-directional path between 
data ports of connecting ATM units. You should have a circuit plan developed in 
advance.

The PathBuilder S330/S310 supports both VPCs (virtual path connections) and 
VCCs (virtual channel connections). A virtual path is an aggregate collection of 
virtual channels for the purpose of assigning the channels to a single physical layer. 
A virtual channel is a connection between data ports.

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You define a VPC at the connecting units by assigning it a Virtual Path Identifier 
(VPI) for each direction of transmission. 

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You define a VCC at the connecting units by assigning it a Virtual Path 
Identifier (VPI) and a Virtual Channel Identifier (VCI) for each direction of 
transmission. You can connect one or more virtual circuits to a data port by 
assigning each a different VPI and VCI. The VPI and VCI numbers are normally 
assigned as a pair: VPI/VCI.

When you add a virtual circuit, you make a connection from the selected port to 
for traffic to flow through the PathBuilder S330/S310 and across the ATM WAN 
service. Typically, the VPI and VCI numbers for one side of the circuit are assigned 
by the network service provider or local IS administrator—depending on whether 
your network is a public or private ATM network.