3com 3018 (3C13618) User Manual

C

HAPTER

 A: O

PTIONAL

 C

ABLE

 S

PECIFICATIONS

Figure 36 illustrates the EIA/TIA-449 DTE cable.

Figure 36   EIA/TIA-449 DTE Cable Assembly

Table 37 describes EIA/TIA-449 DTE cable pinouts.

14

CTS/RTS-

<-

Control-

10

20

RXD/TXD+

<-

Transmit+

2

44

RXD/TXD-

<-

Transmit-

9

15

TXD/RXD+

->

Receiver+

4

39

TXD/RXD-

->

Receiver-

11

16

RXC/TXCE+

->

Timing+

6

40

RXC/TXCE-

->

Timing-

13

-

Shielding sheath

<-->

Shielding sheath

-

Table 36   X.21 DCE Cable Pinouts (continued)

Table 37   EIA/TIA-449 DTE Cable Pinouts 

7

GND

<-->

Circuit GND

19

23

DTE/DCE

-

Circuit GND

19

50

GND

<-->

Sield GND

1

8

DTR/DSR+

->

TR+

12

32

DTR/DSR-

->

TR-

30

13

DSR/DTR+

<-

DM+

11

37

DSR/DTR-

<-

DM-

29

10

RTS/CTS+

->

RS+

7

34

RTS/CTS-

->

RS-

25

38

CTS/RTS+

<-

CS+

9

14

CTS/RTS-

<-

CS-

27

36

DCD/DCD+

<-

RR+

13

12

DCD/DCD-

<-

RR-

31

1

LL/LL

->

LL

10

20

RXD/TXD+

<-

RD+

6

44

RXD/TXD-

<-

RD-

24

15

TXD/RXD+

->

SD+

4

39

TXD/RXD-

->

SD-

22

16

TXCE/RXC+

->

TT+

17