T1 Csu/Dsu Wan Interface (Optional) - Nortel Contivity 4500 Getting Started

T1 CSU/DSU WAN Interface (Optional)

The T1 CSU/DSU WAN crossover cable crosses the blue pair with the orange
pair. This is different from the commonly available crossover cable, which crosses
the green pair with the orange pair. No cables are supplied with the T1 CSU/DSU.
Table 2-3 shows the cable pinouts.
Table 2-3.
DB26S
The cable will operate properly if pins 3, 6, 7, and 8 are not connected.
T1 CSU/DSU Cable Pinouts
Signal
1 RXDA->TXDA
2 RXDB->TXDB
3 not used
4 TXDB<-RXDB
5 TXDA<-RXDA
6 not used
7 not used
8 not used
T1 CSU/DSU
5
4
3
2
1
6
7
8
Cabling the Switch
2-9