ProntoNetLC User Manual
13
The NT1 interface is optional and is not supplied as standard.
When the ProntoNetLC is connected to a basic rate interface with bus
configuration and the unit is the termination point, it must be loaded with 100
Ohm resistors. These may be already fitted in the connection socket, if you do
not have external termination, the ProntoNetLC has jumpers available internally
that can be set to terminate the ISDN line. The jumpers are found next to the
RJ45 connectors.
P2 P3
100Ω RESISTORS CONNECTED
II.3.2.2. X21 Port
The X21 Port allows the transmission and reception of audio via a dedicated
digital connection. The socket is the standard 15 ways Sub-D 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:
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