ELSA LANCOM Business Manuel De L'utilisateur page 220

R44 Description of the menu options
Lay-3
Lay-2
L2-Opt.
Lay-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.
ELSA LANCOM Business
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). Always
select this setting if the remote station sends the data transparently via
ISDN layer 3 (e.g. transparent HDLC, transparent X.75LAPB).
PPP A negotiation is performed according to the point-to-point protocol.
APPP A negotiation is performed as per the asynchronous PPP.
APPP is then used when synchronous PPP is not possible because the
connection does not permit a synchronous transmission (e.g. for analog
modem operation).
SCPPP Following completion of script processing, a synchronous PPP negotia-
tion is initiated.
SCAPPP Following completion of script processing, an asynchronous APPP
negotiation is initiated.
SCTRANS Following completion of script processing, a connection exists to the
remote station. No further protocol negotiation is performed.
In this column, you can select the protocol for ISDN layer 2:
TRANS The data is packed directly in HDLC packets. Always select this setting
if communication is to take place via transparent HDLC.
X.75LAPB The data is exchanged in X.75 secured format. Always select this set-
ting if the remote station is to work with X.75 data protection.
The L2-opt. enables the setting of an option for the data transfer setting under Lay-2
with an additional ELSA LANCOM .
none No data compression or channel bundling is performed.
compr. Stac data compression will be used.
Compression as per Stac (Hi/fn) must be used in connection with PPP or
multilink PPP.
Stac compression may also be used in connection with Windows
remote stations.
bundle Channel bundling is performed via several B channels.
Channel bundling is only possible for the Lay-2 settings of 'PPP'.
bnd+cmpr Channel bundling and data compression takes place over two B chan-
nels.
The lay-1 column allows you to define the speed at which the data is sent in ISDN.
HDLC64K The data is transmitted at 64,000 bps.
HDLC56K The data is transmitted at 56,000 bps. This setting is especially impor-
tant for connections in the USA.
V110_9K6 Data is transferred at 9,600 bps in a V.110 connection, when connect-
ing to GSM mobile phones, for example.
V110_19K2 Data is transferred at 19,200 bps in a V.110 connection.
V110_38K4 Data is transferred at 38,400 bps in a V.110 connection.