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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. T1 CSU/DSU Cable Pinouts
The cable will operate properly if pins 3, 6, 7, and 8 are not connected.
DB26S Signal T1 CSU/DSU
1 RXDA->TXDA 5
2 RXDB->TXDB 4
3 not used 3
4 TXDB<-RXDB 2
5 TXDA<-RXDA 1
6 not used 6
7 not used 7
8 not used 8