Appendix A Technical specifications 73Installing the Contivity 1700The cable you use should be wired in accordance with EIA-568-A wiring style.This wiring style ensures that the transmit signal (pins 1 and 2) and the receivesignal (pins 7 and 8) are carried on a twisted pair inside the patch cord. The use offactory-made patch cords is strongly recommended.You connect the 56/64K CSU/DSU WAN interface card to the service providernetwork using a straight-through cable or a crossover cable, depending on how theservice provider wired its jack.• For a straight-through connection, you can use a standard Category 5(Ethernet) straight-through cable.• For a crossover connection, you cannot use a standard Category 5 crossovercable. The 56/64K CSU/DSU crossover cable and the Ethernet crossovercable are not interchangeable.Table 17 provides the 56/64K CSU/DSU cable pinouts for a crossover connection.The cable will operate properly if pins 3, 4, 5, and 6 are not connected.Table 17 56/64K CSU/DSU cable pinouts for crossover connectionNortel Networks termination Remote terminationSignal Pin # to Pin # SignalTransmit tip 1 7 Receive tipTransmit ring 2 8 Receive ringnot used 3 3 not usednot used 4 4 not usednot used 5 5 not usednot used 6 6 not usedReceive tip 7 1 Transmit tipReceive ring 8 2 Transmit ringCaution: For crossover connections, do not use Ethernet cable. The linkwill not be established.
