Table 33 X.21 Cable Pinouts - Nortel 1750 Install Manual

Table 33
individual wire within a twisted pair.)

Table 33 X.21 cable pinouts

Standard-wired
end 28-pin male
2
14
3
16
15
12
17
9
24
11
4
19
5
13
6
22
20
23
8
10
18
21
25
26
27
28
provides the X.21 cable pinouts. (The pair suffix A or B refers to an
Signal name
TXDA
TXDB
RXDA
RXDB
TXCA
TXCB
RXCA
RXCB
SCTEA
SCTEB
RTSA
RTSB
CTSA
CTSB
DSRA
DSRB
DTRA
DTRB
DCDA
DCDB
LL
RL
TM
M0
M1
M2<-SIGNAL GROUND
Appendix A Technical specifications 99
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
pair 7A
pair 7B
pair 8A
pair 8B
pair 9A
pair 9B
pair 10A
pair 10B
pair 11A
pair 11B
pair 12A
pair 12B
pair 13A
pair 13B
Nortel VPN Router Installation — VPN Router 1750
Standard-wired
end 15-pin male
2
9
4
11
6
13
pair 5A
pair 5B
pair 4A
pair 4B
3
10
5
12
no conn
no conn
no conn
no conn
no conn
no conn
no conn
no conn
no conn
no conn
no conn
8
Notes
Note 1
Note 1
Note 1
Note 1
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 2
Note 3