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VIERLING ISDN configuration: BRI1 BRI2 (100 Ohm) Jack - NT Activate interface No Yes L1 mode ... Network Connection ... PTP L2 mode ... Network L3 mode ... Network Entries in the routing table: All calls from BRI2 go to GSM All calls from GSM go to BRI2 (oI2d*#) (oGd*#) n n G:d I2:d If the PBX has a fixed network connection in addition to ECOTEL®, then a deviation in frequencies can occur between the two. This causes frame slips which occasionally can cause the port to be closed by the PBX. If problems of this sort occur, it is necessary to use the synchronization techniques which are described in the following sections. 3.2.7 Connection to an external S0 port/PTP (external synchronization) 3.2.8 Connection to an external S0 port/PTP (internal synchronization) Page 48 Edition 3.2-EN – 20060530 ECOTEL® VoIP/ISDN2-1/ISDN2-2