2N StarGate/BlueTower v5.3 - Manual (Page 36)

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2N TELEKOMUNIKACE a.s., www.2n.cz
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There are three configuration jumper blocks on the PRI board. JP2 and JP3 are used for
hardware switching of the ISDN PRI connector into the TE / NT configuration. This
operation means only swapping of the transmitting and receiving connector pairs, the
interface configuration must be made using the web interface. With jumper JP4 you can
activate/deactivate the back–up connection between PRI 1 and PRI 2 in case the
system is switched off or the PRI board is not handled by system.
Warning
The back–up connection (JP4) works only in case the wire
settings of PRI 1 (JP3) and PRI 2 (JP2) are set in the opposite
way (e.g. PRI 1 as NT, PRI 2 as TE).
Note
Boards with just one PRI interface (1PRI boards) have the same
settings as the PRI 1 interface on 2PRI boards. And there is no
back–up connection (JP4) either.
Positions of Tx and Rx Wires
Example of Connection with 1ISDN PRI Board