Netopia 4752 - Manual (Page 63)

WAN and System Configuration 9-5
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The Netopia 4752 suppor ts up to eight permanent vir tual circuits.
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On cell-based SDSL and ADSL WAN inter faces, the ATM connection between the device and the central office
equipment (DSLAM) is divided logically into one or more vir tual circuits (VCs). A vir tual circuit may be either a
permanent vir tual circuit (PVC) or a switched vir tual circuit (SVC). Netopia devices suppor t PVCs.
VCs are identified by a Vir tual Path Identifier (VPI) and Vir tual 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 suppor t 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 ”, where 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.