Table 20 X.21 Cable Pinouts - Nortel 600 Installing

Table 20
individual wire within a twisted pair.)

Table 20 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 75
Pair number Standard-wired
and conductor end 15-pin male
pair 1A 2
pair 1B 9
pair 2A 4
pair 2B 11
pair 3A 6
pair 3B 13
pair 4A pair 5A
pair 4B pair 5B
pair 5A pair 4A
pair 5B pair 4B
pair 6A 3
pair 6B 10
pair 7A 5
pair 7B 12
pair 8A no conn
pair 8B no conn
pair 9A no conn
pair 9B no conn
pair 10A no conn
pair 10B no conn
pair 11A no conn
pair 11B no conn
pair 12A no conn
pair 12B no conn
pair 13A no conn
pair 13B 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
Installing the Contivity 600