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86 Appendix A Technical specifications
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 30 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. This cable enables the WAN adapter to function as DTE (data
terminal equipment).
Table 25
cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted
pair.)
Table 25 V.35 cable pinouts
Standard-wired
end 28-pin male
2
14
3
16
15
12
17
9
24
11
4
19
NN46110-308 02.01
provides the V.35 cable pinouts.
Signal name
TXDA
TXDB
RXDA
RXDB
TXCA
TXCB
RXCA
RXCB
SCTEA
SCTEB
RTSA
RTSB
Table 26 on page 88
Pair number
and conductor
pair 1A
pair 1B
pair 2A
pair 2B
pair 3A
pair 3B
pair 4A
pair 4B
pair 5A
pair 5B
pair 6A
pair 6B
Figure 30
provides the X.21
Special-wired
end 34-pin male
P
S
R
T
Y
AA
V
X
U
W
C
no conn
Notes
Note 1
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