i-modul ISDN HIX V4
Functions
6.8
Configuring the Transfer Protocol
The information transfer in the ISDN B channel is performed via dedicated
protocols. The i-modul ISDN HIX V4 supports different ISDN protocols, which can
be used for specific applications. The following table lists all protocols supported
by the i-modul ISDN HIX V4 with application examples.
The X.75 protocol is enabled in default setting.
ATB Protocol
Usage
0
V.110 asynchronous
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 asyn-
chronous)
For remote data transmission connections or
connections to an internet provider.
4
HDLC transparent (oc-
tets are packed into
HDLC frames)
Control protocol for point-to-point data transmis-
sion. Usually connection with X.75 for data pro-
tection used. HDLC uses no control characters.
The usage of "frames" and "windows" during
transmission 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 asynchronous
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 Deutsche Telekom.
21
X.31 D channel
X.31 is an international manufacturer-
independent ITU standard for connecting ISDN
systems to X.25 networks. Packet-mode termi-
nals are supported by ISDN by X.31.
31
MLPPP
For channel bundling; provides a higher transmis-
sion rate of up to 128 kb/s.
Table 9: Supported ISDN protocols with usage
33