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Appendix A Technical specifications 91
Nortel VPN Router Installation — VPN Router 1750
The following table provides the V.90 modem port cable pinouts.
Single V.35/X.21 WAN interface card
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).
“V.35 cable pinouts” on page 91 provides the V.35 cable pinouts. “X.21 cable
pinouts” on page 94 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
Pin Function
1N/C
2Tip
3 Ring
4N/C
Table 32 V.35 cable pinouts
Standard-wired
end 28-pin male Signal name
Pair number
and conductor
Special-
wired end
34-pin male Notes
2 TXDA Pair 1A P
14 TXDB Pair 1B S
CS160011A