Nortel Networks 1750 User Manual

Appendix A Technical specifications 91

Nortel VPN Router Installation — VPN Router 1750 

The following table provides the V.90 modem port cable pinouts.

The single V.35/X.21 WAN interface card has a single DB28S connector that 
provides the signals to interface to V.35 and X.21 equipment. The following figure 
shows the single V.35/X.21 WAN interface card.

Figure 33   Single V.35/X.21 WAN interface card

You need a DSU/CSU between the WAN connection and the gateway. You can 
order a V.35 or X.21 cable to attach to the connector. With this cable, the WAN 
adapter can function as data terminal equipment (DTE).

 provides the V.35 cable pinouts. 

 provides the X.21 cable pinouts. (The pair suffix A or B 

refers to an individual wire within a twisted pair.) 

Table 31   MV.90 modem cable pinouts

1

N/C

2

Tip

3

Ring

4

N/C

Table 32   V.35 cable pinouts

2

TXDA

Pair 1A

P

14

TXDB

Pair 1B

S

CS160011A