Prontonet User’s Manual v410 12
II.3.2.2. ISDN Port
The ProntoNet incorporates an ISDN terminal adapter that allows connection to
a basic ISDN line (2B+D). It supports different ISDN protocols (EURO_ISDN,
DMS100, AT&T 5ESS and NAT1). To connect there are two RJ45 connectors: one
for connecting to an S/T interface and the other for connecting to a U interface.
Pin S/T Connector U Connector
1
NC NC
2
NC NC
3
Tx + NC
4
Rx+ RING
5
Rx- TIP
6
Tx- NC
7
NC NC
8
NC NC
The U connector is only available if an NT1 interface is installed.
The NT1 interface is optional and is not supplied as standard.
When the ProntoNet 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 ProntoNet 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
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