1

Shield Ground

AA

7

Signal Ground

AB

102

4

5

2

Transmitted Data (DTE)

BA

103

6

3

3

Received Data (DCE)

BB

104

5

2

4

Request To Send (DTE)

CA

105

8

7

5

Clear To Send (DCE)

CB

106

7

8

6

DCE Ready (DCE)

CC

107

1

6

20

DTE Ready (DTE)

CD

108.2

3

4

22

Ring Indicator (DCE)

CE

125

1

9

8

Received Line Signal Detector (DCE)

CF

109

2

1

23

Data Signal Rate Select
(DTE/DCE Source)

CH/CI

111/112

24

Transmit Signal Element Timing (DTE)

DA

113

15

Transmitter Signal Element Timing (DCE)

DB

114

17

Receiver Signal Element Timing (DCE)

DD

115

18

Local Loopback / Quality Detector

LL

141

21

Remote Loopback

RL/CG

140/110

14

Secondary Transmitted Data (DTE)

SBA

118

16

Secondary Received Data (DCE)

SBB

119

19

Secondary Request To Send (DTE)

SCA

120

13

Secondary Clear To Send (DCE)

SCB

121

12

Secondary Received Signal Detector/
Data Signal Rate Select (DCE)

SCF/CI

122/112

25

Test Mode

TM

142

9,10

Reserved for Testing

11

Unassigned