Nortel Networks 2750 manual Single V.35/X.21 WAN interface card, modem cable pinouts

98Appendix A Technical specifications

Table 32 provides the V.90 modem port cable pinouts.

Table 32 V.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 needed to interface to V.35 and X.21 equipment. Figure 43 on page 98 shows the single V.35/X.21 WAN interface card.

Figure 43 Single V.35/X.21 WAN interface card

CS160011A

You need a DSU/CSU (digital service unit/channel service unit) 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 DTE (data terminal equipment).

Table 33 provides the V.35 cable pinouts. Table 34 on page 100 provides the X.21 cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted pair.)

Table 33 V.35 cable pinouts

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

NN46110-318 02.01