Nortel Networks 2700 User Manual
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.
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