Nortel 1100 Installation Instruction

Appendix A  Technical specifications  197

Nortel VPN Router Installation — Hardware Options 

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

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 professionally manufactured 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. You cannot interchange the T1/E1 CSU/DSU crossover cable and the 
Ethernet crossover cable.

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

Note: Nortel  does not supply an interface cable with the 

 

T1/E1 CSU/DSU WAN interface card.

T1/E1 CSU/DSU cable pinouts for crossover connection

 

 

 

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

5

TXDA->RXDA

wht/blu pair 1A

1

6

not used

green pair 3B

6

7

not used

wht/brn pair 4A

7

8

not used

brown pair 4B

8