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2-16 Firmware User Guide
Multiple ATM Permanent Virtual Circuits
The Netopia Firmware Version 5.4 supports up to eight permanent virtual circuits.
Multiple ATM PVC overview
On cell-based DSL WAN interfaces, the ATM connection between the device and the central office equipment
(DSLAM) is divided logically into one or more virtual circuits (VCs). A virtual circuit may be either a permanent
virtual circuit (PVC) or a switched virtual circuit (SVC). Netopia devices support PVCs.
VCs are identified by a Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI). A VPI is an 8-bit value
between 0 and 255, inclusive, while a VCI is a 16-bit value between 0 and 65535, inclusive.
■ Circuits now support attributes in addition to their VPI and VCI values. When configuring a circuit, you can
specify an optional circuit name of up to 14 characters. The circuit name is used only to identify the circuit
for management purposes as a convenience to aid in selecting circuits from lists. The default circuit name
is “Circuit <n>”, where <n> is some number between one and eight corresponding to the circuit’s position
in the list of up to eight circuits.
■ You can also individually enable or disable a circuit without deleting it. This is useful for temporarily
removing a circuit without losing the configured attributes.
■ In order to function, each circuit must be bound to a Connection Profile or to the Default Profile. Among
other attributes, the profile binding specifies the IP addressing information for use on the circuit. Each
circuit must be bound to a distinct Connection Profile. You cannot bind multiple circuits to the same
Connection Profile.
Multiple ATM PVC configuration
ATM VPI/VCI Autodetection. You can bind multiple circuits to the same Connection Profile. Netopia Firmware
Version 5.4 allows you to have a standard configuration that uses, for example, four VCs (0/35, 0/38, 8/35,
8/38) pointing to the same profile.
The unit will now automatically select the active VC on networks with a VPI/VCI of any of these four values
without any custom configuration of the unit. You must, however, manually create these VCs and associate
them with the profile you desire.
You configure Virtual Circuits in the Add/Change Circuit screen.
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