INSYS ISDN TA 4.0
Functions
9.11
Configuring the Transfer Protocol
The information transfer in the ISDN B channel is performed via dedicated
protocols. The INSYS ISDN TA 4.0 supports different ISDN protocols, which can be
used for specific applications. The following table lists all protocols supported by
the INSYS ISDN TA 4.0 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
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 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 terminals 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 14: Supported ISDN protocols with usage
59