Nortel Networks 2700 Manual Do Utilizador

  Appendix A  Technical specifications

NN46110-311 02.01

The following notes apply to the single V.35 DTE cable:
1. The term “no conn” means the wire is not connected to a pin in the 34-pin connector.
2. Wires 12B, 13A, and 14B connect to pin B in the 34-pin connector.
3. At each end, the cable shield and connector shell must connect respectively to pin A of the 34-pin connector and 

 

pin 1 of the standard 28-pin connector.

4. Do not connect Shield to Signal Ground because these are separate signals.

 provides the X.21 cable pinouts. (The pair suffix A or B refers to an 

individual wire within a twisted pair.)

25

TM

pair 12A

NN

26

M0<-SIGNAL GROUND

pair 12B

B

Note 2

27

M1<-SIGNAL GROUND

pair 13A

B

Note 2

28

M2

pair 13B

no conn

Note 1

1

SHIELD

pair 14A

A

Notes 3,4

7

SIGNAL GROUND

pair 14B

B

Notes 2,4

X.21 cable pinouts 

 

 

 

2

TXDA

pair 1A

2

14

TXDB

pair 1B

9

3

RXDA

pair 2A

4

16

RXDB

pair 2B

11

15

TXCA

pair 3A

6

12

TXCB

pair 3B

13

17

RXCA

pair 4A

pair 5A

Note 1

9

RXCB

pair 4B

pair 5B

Note 1

24

SCTEA

pair 5A

pair 4A

Note 1

11

SCTEB

pair 5B

pair 4B

Note 1

4

RTSA

pair 6A

3

19

RTSB

pair 6B

10

V.35 cable pinouts  (continued)