ZyXEL P-2812HNU-51c User Manual download pdf (Page 104)

Chapter 5 WAN Setup

P-2812HNU-51c User’s Guide

104

The following table describes the fields in this screen.

Table 19 Layer 2 Interface Configuration

LABEL DESCRIPTION

ATM PVC

Configuration

VPI (Virtual Path Identifier) and VCI (Virtual Channel Identifier) define

a virtual circuit. This section is available only when you configure an

ATM layer-2 interface.

VPI The valid range for the VPI is 0 to 255. Enter the VPI assigned to you.

VCI The valid range for the VCI is 32 to 65535 (0 to 31 is reserved for local

management of ATM traffic). Enter the VCI assigned to you.

Select DSL Link

Type

Select EoA (Ethernet over ATM) to have an Ethenet header in the

packet, so that you can have multiple services/connections over one

PVC. You can set each connection to have its own MAC address or all

connections share one MAC address but use different VLAN IDs for

different services. EoA supports ENET ENCAP (IPoE), PPPoE and

RFC1483/2684 bridging encapsulation methods.

Select PPPoA (PPP over ATM) to allow just one PPPoA connection over

a PVC.

Select IPoA (IP over ATM) to allow just one RFC 1483 routing

connection over a PVC.

Encapsulation

Mode

Select the method of multiplexing used by your ISP from the drop-

down list. Choices are:

• VC/MUX: In VC multiplexing, each protocol is carried on a single

ATM virtual circuit (VC). To transport multiple protocols, the P-

2812HNU-51c needs separate VCs. There is a binding between a

VC and the type of the network protocol carried on the VC. This

reduces payload overhead since there is no need to carry protocol

information in each Protocol Data Unit (PDU) payload.

• LLC/ENCAPSULATION: More than one protocol can be carried

over the same VC. This is available only when you select PPPoA in

the Select DSL Link Type field.

• LLC/SNAP-ROUTING: In LCC encapsulation, an IEEE 802.2

Logical Link Control (LLC) header is prefixed to each routed PDU to

identify the PDUs. The LCC header can be followed by an IEEE

802.1a SubNetwork Attachment Point (SNAP) header. This is

available only when you select IPoA in the Select DSL Link Type

field.

• LLC/SNAP-BRIDGING: In LCC encapsulation, bridged PDUs are

encapsulated by identifying the type of the bridged media in the

SNAP header. This is available only when you select EoA in the

Select DSL Link Type field.

Service Category Select UBR Without PCR or UBR With PCR for applications that are

non-time sensitive, such as e-mail.

Select CBR (Continuous Bit Rate) to specify fixed (always-on)

bandwidth for voice or data traffic.

Select Realtime VBR (real-time Variable Bit Rate) for applications

with bursty connections that require closely controlled delay and delay

variation.

Select Non Realtime VBR (non real-time Variable Bit Rate) for

connections that do not require closely controlled delay and delay

variation.

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