This document describes how to use the PAD built by TDT. We use the TA-Omega in a special configuration for the Austrian Federal Railways ÖBB. The ÖBB X25 protocol is described in the "ÖBB X25 Pflichtenheft". This protocol specifies the Layer 4 to 7 for vital and none-vital comunication between railway-station equipment (e. q. interlocking, etc.). The ÖBB X25 protocol specification uses the CCITT X.25 / X.21 communication and uses PVC 1 for channel A and PVC 2 for channel B transmission.
The two-channel transmission in channel A and channel B is used for raising the safety of the connection. In channel B the data is transmitted inverted. For more details cunsult the "ÖBB X25 Pflichtenheft".
If you have any suggestions to this document, than feel free to contact me:
Have a lot of fun with this easy to use, easy to configure and very small X.25 PAD TA-Omega from TDT.
For testing the configuration in this document I used the following testequipment:
+-----------------+
R2| | DAG64
ch. A -----| |R1 +-----+
R3| TA-Omega |-----|Modem|~~~~~~~~~~~~~~~+
ch. B -----| | +-----+ |
| | |
+-----------------+ 2-wire |
longdistance|
+-------------+ connection |
| | DAG64 |
ch. A -----| | +-----+ |
| Datus-PAD |---------|Modem|~~~~~~~~~~~~~~~+
ch. B -----| | +-----+
| |
+-------------+
TA-Omega ..... TA-Omega from TDT
Modem ........ X.21 Modem with 64 kBit/sec
e.q.: Nokia SB 64k
or
Siemens DAG 64
Datus-PAD .... 5820 with 2 V.24 connectors and 1 X.21
connector
On channel A and B on both ends of the testconfiguration (Datus-PAD and TA-Omega) i connected the Testrechner TR application, which you also can find on my homepage. You may use any other applications with V.24 connection with 19.200 baud, no parity, 8 Bit, 1 Stopbit.