2N StarGate/BlueTower v5.7 - Manual (Page 37)

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2N TELEKOMUNIKACE a.s., www.2n.cz
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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.
Positions of Tx and Rx Wires
Example of Connection with 1ISDN PRI Board
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.