Single V.35/X.21 Wan Interface Card; Figure 43 Single V.35/X.21 Wan Interface Card; Table 32 V.35 Cable Pinouts; Nortel Vpn Router Installation — Vpn Router - Nortel 1750 Install Manual

Table 31 MV.90 modem cable pinouts (continued)
Pin
3
4

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.
shows the single V.35/X.21 WAN interface card.

Figure 43 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 to attach to
the connector. With this cable, the WAN adapter can function as DTE (data
terminal equipment).
Table 32
cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted
pair.)

Table 32 V.35 cable pinouts

Standard-wired
end 28-pin male
2
14
3
16
15
12
Function
Ring
N/C
provides the V.35 cable pinouts.
Signal name
TXDA
TXDB
RXDA
RXDB
TXCA
TXCB
Appendix A Technical specifications 97
CS160011A
Table 33 on page 99
Pair number
and conductor
pair 1A
pair 1B
pair 2A
pair 2B
pair 3A
pair 3B
Nortel VPN Router Installation — VPN Router 1750
Figure 43
provides the X.21
Special-wired
end 34-pin male
P
S
R
T
Y
AA
Notes