AL5068S Designer’s Guide
No. AL5068S-E00-105 Altec Electronic AG Seite 16 / 25
3.3 S
0
INTERFACE
The ISDN Socket Modem has all the necessary circuitry for the S
0
Interface
on-board, and is designed to meet the I.430 requirements of the European
ISDN Network (S
0
Bus).
The TX+/- and RX+/- signals must be provided from the RJ45 Telco jack to
pins 1 to 4 of the Socket Modem.
The TX+/- and RX+/- signal traces are to be no closer than 2.5mm (0.1”) from
any other traces on the main board.
Pin Signal I/O type Function
1 TX+ O ISDN Transmit +, RJ45 jack Pin 3
2 TX- O ISDN Transmit -, RJ45 jack Pin 6
3 RX+ I ISDN Receive +, RJ45 jack Pin 4
4 RX- I ISDN Receive -, RJ45 jack Pin 5
6 TX+ O ISDN Transmit +, RJ45 jack Pin 3
7 RX+ I ISDN Receive +, RJ45 jack Pin 4
8 RX- I ISDN Receive -, RJ45 jack Pin 5
9 TX- O ISDN Transmit -, RJ45 jack Pin 6
8
7
6
5
4
3
2
1
Pin 1
Pin 2
Pin 3
Pin 4
To
Modem
Module
RJ45 Jack
8 pole
TX+
TX-
RX+
RX-
