Nortel Networks 2750 User Manual
98
Appendix A Technical specifications
NN46110-318 02.01
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 needed to interface to V.35 and X.21 equipment.
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).
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).
provides the V.35 cable pinouts.
provides the X.21
cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted
pair.)
pair.)
Table 32
V.90 modem cable pinouts
Pin
Function
1
N/C
2
Tip
3
Ring
4
N/C
Table 33
V.35 cable pinouts
Standard-wired
end 28-pin male
Signal name
Pair number
and conductor
and conductor
Special-wired
end 34-pin male
Notes
2
TXDA
pair 1A
P
14
TXDB
pair 1B
S
CS160011A