Configuring Virtual Circuits 133
Configuring the VCM
Card
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.
Configuring Virtual
Circuits
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.
n You define a VPC at the connecting units by assigning it a Virtual Path Identifier
(VPI) for each direction of transmission.
n 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.
