Prontonet User’s Manual v410 13
II.3.2.3. X21 Port
The X21 Port allows the transmission and reception of audio via a dedicated
digital connection. The socket is the standard 15-pin X21 subD with the
following connections:
Pin Function Pin Function
1 NC 9 Transmit Data TxD+
2 Transmit Data TxD- 10 NC
3 NC 11 Receive Data RxD+
4 Receive Data RxD- 12 NC
5 NC 13 Clock +
6 Clock - 14 NC (Internally used)
7 NC (Internally used) 15 NC
8 GND
To connect a V35 port one must bear in mind the following correlation between
signals:
Pin X21 ProntoNet V35 Signal
2 Transmit Data TxD- P
9 Transmit Data TxD+ S
4 Receive Data RxD- R
11 Receive Data RxD+ T
6 Clock - V
13 Clock+ X
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