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Appendix A Technical specifications 57
Nortel VPN Router Installation — VPN Router 1010/1050/1100
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 26
shows the single V.35/X.21 WAN interface card.
Figure 26 Single V.35/X.21 WAN interface card
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 from
Nortel to attach to the connector. This cable enables the WAN adapter to function
as DTE (data terminal equipment).
Table 26 provides the V.35 cable pinouts. Table 27 on page 59 provides the X.21
cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted
pair.)
Table 26 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
3 RXDA pair 2A R
16 RXDB pair 2B T
15 TXCA pair 3A Y
12 TXCB pair 3B AA
17 RXCA pair 4A V
9 RXCB pair 4B X
24 SCTEA pair 5A U
11 SCTEB pair 5B W
4 RTSA pair 6A C
19 RTSB pair 6B no conn Note 1
CS160011A