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.