Nortel Networks 2700 manual T1/E1 CSU/DSU WAN interface card full-height card

Appendix A Technical specifications 93

Figure 40 T1/E1 CSU/DSU WAN interface card (full-height card)

CS160012A

The connector on the T1/E1 CSU/DSU WAN interface accommodates an 8-pin RJ-48 modular patch cord. These cables are sold as Category 5, or Ethernet, cables.

Note: Nortel does not supply the T1/E1 CSU/DSU WAN interface cable with the WAN interface card.

Use cable that is wired in accordance with EIA-568-A wiring style. This wiring style ensures that a twisted pair inside the patch cord carries the transmit signal (pins 4 and 5) and the receive signal (pins 1 and 2). Nortel strongly recommends that you use factory-made patch cords.

You connect the T1/E1 CSU/DSU WAN interface card to the service provider network using a straight-through cable or a crossover cable, depending on how the service 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 crossover cable. Do not interchange the T1/E1 CSU/DSU crossover cable and the Ethernet crossover cable.

Table 29 provides the T1/E1 CSU/DSU cable pinouts for a crossover connection.

Table 29 T1/E1 CSU/DSU cable pinouts for crossover connection

Standard-wired		Pair number	Special-wired
end 8-pin male	Signal name	and conductor	end 8-pin male
1	RXDA<-TXDA	wht/org pair 2A	5
2	RXDB<-TXDB	orange pair 2B	4
3	not used	wht/grn pair 3A	3
4	TXDB->RXDB	blue pair 1B	2

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