Nortel Networks 1750 manual Single V.35/X.21 WAN interface card

Appendix A Technical specifications 91

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

Table 31 MV.90 modem cable pinouts

Pin	Function
1	N/C
2	Tip
3	Ring
4	N/C

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

CS160011A

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 32 V.35 cable pinouts

			Special-
Standard-wired		Pair number	wired end
end 28-pin male	Signal name	and conductor	34-pin male	Notes
2	TXDA	Pair 1A	P
14	TXDB	Pair 1B	S

Nortel VPN Router Installation — VPN Router 1750