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Appendix A Technical specifications 95
Nortel VPN Router Installation — VPN Router 1750
20 DTRA Pair 9A No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
23 DTRB Pair 9B No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
8 DCDA Pair 10A No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
10 DCDB Pair 10B No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
18 LL Pair 11A No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
21 RL Pair 11B No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
25 TM Pair 12A No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
26 M0 Pair 12B No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
27 M1 Pair 13A No conn The term No conn means
the wire does not connect
to a pin in the 15-pin
connector.
28 M2<-SIGNAL GROUND Pair 13B 8 Wires 13B and 14B
connect to pin 8 in the
15-pin connector.
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