Aastra OpenCom 131 User Guide - Page 72
Wire the S, On the OpenCom 150 the pressure terminal is a 5-pin connector. The addi
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S2M Connector Module 34 12 S2M LEDs S2M slot (Underside of the module board) Installation Position of the LEDs on the S2M module 5. Wire the S2M port of the connector module to the NT or the other PBX according to the following drawing. Make sure the RX and TX lines are crossed over (connect the RX lines of the OpenCom 130 / 150 to the TX lines of the other PBX). PBX 1, S2M Rx+ Rx- Tx+ Tx- Rx+ Rx- Tx+ TxPBX 2, S2M (Pressure clamps) Example of the wiring of the S2M port for two OpenCom 130 / 150s On the OpenCom 150 the pressure terminal is a 5-pin connector. The additional terminal is used to connect the shielding of a shielded line. The shielding has to be stripped as short as possible (approx. 3 mm). 6. If necessary, check to make sure that the NT is fed by its own power supply. 70