INSYS Pocket ISDN
Functions
45
10.9
Configuring the Transfer Protocol
The information transfer in the ISDN B channel is performed via dedicated
protocols. The INSYS Pocket ISDN supports different ISDN protocols, which can be
used for specific applications. The following table lists all protocols supported by
the INSYS Pocket ISDN with application examples.
The X.75 protocol is enabled in default setting.
ATB Protocol
Usage
0
V.110 asynchro-
nous
For connections to the GSM network (CSD data
connection).
The bit rate (300 to 38.400 bps) must be identical at
both communication partners.
3
HDLC async to
sync conversion
(PPP asynchronous)
For remote data transmission connections or con-
nections to an internet provider.
4
HDLC transparent
(octets are packed
into HDLC frames)
Control protocol for point-to-point data transmis-
sion. Usually connection with X.75 for data protec-
tion used. HDLC uses no control characters. The
usage of "frames" and "windows" during transmis-
sion allows to detect errors and repeat the partial
transmission, if required.
5
Byte transparent
voice connection
(raw B channel
data)
Byte-by-byte transmission without protocol.
6
Byte transparent
data connection
(raw B channel
data)
Protocol for byte-transparent data transmission.
10
X.75 SLP
Standard protocol for data transmission in packet-
switched networks in ISDN with transfer rate up to
64 kbit/s. Takes over the same tasks like V.42 for
modem connections in principle. The size of the
data blocks on level 2 (Datalength, Framesize,
Blocksize) and the maximum number of blocks to
be sent (Windowsize) can be configured.
13
V.120 asynchro-
nous
This protocol is adjusted to V.110.
20
X.31 B channel
(X.25 B channel)
Protocol for data transfer in packet switched net-
works like Datex-P of Deutschen Telekom (not IN-
SYS Pocket ISDN Internet).
