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Appendix A Technical specifications 99
Nortel VPN Router Installation — VPN Router 2700
The following notes apply to the single X.21 cable:
1. Wires of pair 4 connect to wires of pair 5, but not to any pins in the DA-15.
2. The term “no conn” means the wire is not connected to a pin in the 15-pin connector.
3. Wires 13B and 14B connect to pin 8 in the 15-pin connector.
4. At each end, the cable shield and connector shell must connect to pin 1 of the connector.
5. Do not interconnect Shield to Signal Ground because these are separate signals.
5 CTSA pair 7A 5
13 CTSB pair 7B 12
6 DSRA pair 8A no conn Note 2
22 DSRB pair 8B no conn Note 2
20 DTRA pair 9A no conn Note 2
23 DTRB pair 9B no conn Note 2
8 DCDA pair 10A no conn Note 2
10 DCDB pair 10B no conn Note 2
18 LL pair 11A no conn Note 2
21 RL pair 11B no conn Note 2
25 TM pair 12A no conn Note 2
26 M0 pair 12B no conn Note 2
27 M1 pair 13A no conn Note 2
28 M2<-SIGNAL GROUND pair 13B 8 Note 3
1 SHIELD pair 14A 1 Note 4,5
7 SIGNAL GROUND pair 14B 8 Note 3,5
Table 33 X.21 cable pinouts (continued)
Standard-wired
end 28-pin male Signal name
Pair number
and conductor
Standard-wired
end 15-pin male Notes