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WAN and System Configuration 9-3
need to change it unless your provider specifically tells you to do so.
■ Select Data Link Encapsulation and from the pop-up menu choose your DLE.
■ If you selected RFC1483, the next pop-up menu RFC1483 Mode offers the choice of Bridged 1483 or
Routed 1483. If you select Bridged 1483, a new option PPP over Ethernet (PPPoE) appears. You can
then toggle PPPoE On or Off. Choosing Routed 1483 hides the PPPoE option.
■ If you selected PPP, the next pop-up menu PPP Mode offers the choice of VC Multiplexed or LLC SNAP.
■ If you selected ATM WAN DSL Mode, the next three fields, Display/Change Circuit, Data Circuit VPI, and
Data Circuit VCI are editable. Otherwise they do not appear. Enter the Virtual Path Identifier and Virtual
Channel Identifier values that your provider specifies. For more information on VPIs and VCIs, see “Multiple
ATM Permanent Virtual Circuit Support” below.
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The Netopia 4753 supports up to eight permanent virtual circuits.
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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.