ELSA Documentation


Layer-list

Settings for the layer combinations used

With a layer, a collection of protocol settings are defined, which should be used when connecting to specific remote stations.

Layer-name Encaps. Lay-3 Lay-2 Lay-1
DEFAULT LLC/SNAP TRANS TRANS AAL-5
PPP TRANS PPP TRANS AAL-5

In the layer list, you can freely define the different B-channel protocols by combining various ISDN layers. This enables compatibility to devices from other manufacturers that use different B-channel protocols to be set.

The following table below is provided as an example and also shows the default settings for an ELSA LANCOM:

Layer-name Encaps. Lay-3 Lay-2 L2-Opt. Lay-1
DEFAULT TRANS PPP TRANS bnd+cmpr HDLC64K
PPPHDLC TRANS PPP TRANS none HDLC64K
MLPPP TRANS PPP TRANS bnd+cmpr HDLC64K
RAWHDLC TRANS TRANS TRANS none HDLC64K

Below is a detailed description of the meaning of each field:

Layer-name In this column, you can enter an original name designating the layer combination that you use. These names can then be used in the name list 'layer name' column depending on their spelling to set the protocol. If an entry with the name DEFAULT is defined in this column, the settings stored there are always used when no layer name can be assigned. The user may delete or change any of the layers predefined here.
Encaps. Additional information regarding the data to be transmitted may be specified in the Encaps column. The following entries are possible:

TRANS No Ethernet header is sent in this setting. Only "pure" IP data packets are transferred, for example. This setting provides the greatest possible effective data throughput.
Lay-3 In the lay-3 column, you can define additional headers for data transmission in ISDN. You can select from among the following settings:

TRANS No additional header is inserted (higher data throughput)

PPP A negotiation is performed according to the point-to-point protocol

DHCP Login via DHCP
Lay-2 In this column, you can select the protocol for layer 2
Lay-1 In this column, you can select the protocol for layer 1

To link to devices from other manufacturers, please check with that manufacturer for the data format used (PPP is almost universally supported).

For Internet and remote access, PPP is generally specified.


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