Layer List

A layer defines a collection of protocol settings to be used for connecting to specific remote sites. The list of communication layers can be found under:

LANconfig: Communication > General > Communication layers

Console: Setup > WAN > Layer

The communication layer list includes predefined common protocol combinations. Changes or additions should only be made if the remote sites are incompatible with the existing layers. The possible options are shown in the following overview.

Layer name

The layer is selected by this name in the remote site lists.

Encapsulation

Additional encapsulations can be set for the data packets:

Transparent

No additional encapsulation.

Ethernet

Encapsulation as Ethernet frames.

LLC-ETH

Ethernet over ATM with LLC encapsulation according to RFC 2684.

LLC-MUX

Multiplexing over ATM with LLC/SNAP encapsulation according to RFC 2684. Multiple protocols can be transmitted within the same VC (Virtual Channel).

VC-MUX

Multiplexing over ATM by creating additional VCs according to RFC 2684.

Layer-3

The following options are available for the network layer (Layer 3):

Transparent

No additional header is added.

PPP

The connection is established according to the PPP protocol (in synchronous mode, i.e., bit-oriented). Configuration data is taken from the PPP table.

DHCP

Assignment of network parameters via DHCP.

DHCP (Broadcast Flag)

The connection is established using a DHCP client with the broadcast flag set in DHCP.

Layer-2

This field configures the upper part of the Data Link Layer (Layer 2). The following options are available:

Transparent

No additional header is added.

PPPoE

Encapsulation of PPP protocol information into Ethernet frames.

Layer-1

This field configures the lower part of the Data Link Layer (Layer 1). The following options are available:

ETH

Transparent Ethernet according to IEEE 802.3.

WWAN

For connections via the internal WWAN modem.

XDSL

For connections via the internal DSL modem.