Nortel 1700, Installing Manual

Page: 81 / 94

Appendix A Technical specifications 81
Installing the Contivity 1700
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 provides the V.35 cable pinouts. Table 26 on page 82 provides the X.21
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 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
5 CTSA pair 7A D
13 CTSB pair 7B no conn Note 1
6 DSRA pair 8A E
22 DSRB pair 8B J
20 DTRA pair 9A H
23 DTRB pair 9B no conn Note 1
8 DCDA pair 10A F
10 DCDB pair 10B no conn Note 1
18 LL pair 11A L
21 RL pair 11B N