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Configuring Virtual
Circuits
Supported Classes of
Virtual Circuits
After you have configured the modules and ports on the PathBuilder S330/S310
switch, 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 switch 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.
You define a VPC at the connecting units by assigning it a Virtual Path Identifier
(VPI) for each direction of transmission.
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 switch 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.
The port VPI/VCI ATM circuit designators must match the application being
supported. For example, if an OC3/STM-1 multi-mode fiber module is installed in
the Side B slot of the PathBuilder S330/S310 switch and is connected to a LAN
ATM switch device, then the Rx VPI/VCI for the ATM LAN interface must match the
Tx VPI/VCI for the OC3/STM-1 UNI module and vice versa. This ensures the first
step in making the connection into the PathBuilder S330 switch.
The PathBuilder S330/S310 switch supports four classes of virtual circuits;
PVC — Standard VP/VCC permanent virtual circuits connecting various type of
data ports. For details about setting up PVC virtual circuits, see "Adding PVC
Virtual Circuits" later in this chapter.
RS-366 Template — Video-associated virtual circuit templates. When the circuit
defined by an RS-366 template is activated, it supports dialed video conferencing
over an ATM network. For details setting up RS-366 virtual circuit templates, see
"Defining RS-366 (Video) Virtual Circuit Templates" later in this section.
VCM VCC — Voice Compression module VCC virtual circuits. VCM VCC circuits
carry individual voice, fax, modem, or data connections. For details about setting
up VCM VCC circuits, see "Adding Voice Compression Module VCC Circuits" later
in this chapter.
VCM Subchannel — Voice Compression module subchannel circuits. VCM
subchannel circuits carry multiple voice samples from a single DS0. For details
about setting up subchannel circuits, see "Adding VCM Subchannel Circuits" later
in this chapter.
Configuring Virtual Circuits
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