Ascotel IntelliGate 2025/2045/2065
Part 2 Data services 359
Application examples:
• Message to all callers, stating that the subscriber will only be available again
later: SC A ← SC B
• Reference to a required callback: SC A → SC B
• Appointment transmission: SC A ↔ SC B
• Advance transmission of a code word or ID for logging into a system (SC B)
from a CTI application: SC A → SC B
6.4 X.25 in the D channel
The public ISDN network provides transitions from the D channel of an ISDN
access to X.25 data networks (X.31 Case B)
1)
. It provides the capability of trans-
mitting packet-orientated data over the D channel at a max. of 9.600 bit/s (with
low priority) in addition to protocol messages (example: automatic teller
machines, credit card terminals).
The advantage of data transmission over the D channel is that voice / data calls
can be made simultaneously over the allocated B channels.
Fig. 2.108: X.25 transmission via the D channel
For information concerning the wiring and the availability of the service at the
interfaces, refer to "Part 4 Installation".
1)
Only available in certain countries.
X.25
S
P-MP
V.24
X.25-D
Terminal Adapter
ISDN
T
P-P
haz0140aaenc0
X.25
terminal
PBX
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