3com S330 User Manual

C

HAPTER

 4: C

ONFIGURING

 P

ATH

B

UILDER

 S330/S310 M

ODULES

, P

ORTS

, 

AND

 A

PPLICATIONS

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 WAN Access 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.

The PathBuilder S330/S310 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.

RS366 Template—Video-associated virtual circuit templates. When the circuit 
defined by an RS366 template is activated, it supports dialed video conferencing 
over an ATM network. For details setting up RS-366 virtual circuit templates, see 
“Defining RS366 (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 and/or voice 
samples from multiple DS0s, thereby providing connections for high-rate 
applications such as video conference or multiple-link PPP. For details about setting 
up subchannel circuits, see “Adding VCM Subchannel Circuits” later in this 
chapter.

To define a virtual circuit, follow these steps:

1 From the Configuration Management menu, select [2] Manage Circuit to display 

the Virtual Circuit Menu, shown in Figure 103.

Figure 103   Virtual Circuit Menu