Signa

ITU-TSS

EIA

Pin/Signal

Direction

l Pin

Signal

Signal

Description

DTE-

 

Name

Name

 

DCE

 

 

 

Loop Test.

 

22

125

CE

Ring

 

 

 

Indicator(RI).

 

24

113

DA

Transmit Clock

 

 

 

Signal (source:

 

 

 

 

DTE).

 

25

142

 

Test Indicator.

Macintosh Serial Port Pinouts

The following table shows the wiring of a modem Macintosh hardware handshaking cable:

Mac

Modem

Description

Din 8

DB 25

 

1

4 & 20

DTR to RTS and DTR, Hardware

 

 

Handshaking Out

2

5

CTS to CTS, Hardware Handshaking In

3

2

TX- to TXD, Data sent

4

7

GND, Ground

5

3

RX- to RXD, Data received

6

-

not connected

7

8

GPI to CD, Carrier detected

8

7

GND, Ground, needed for RS-232

 

 

connections

Terminal Pinouts 135

Page 147
Image 147
ZyXEL Communications U-336R/RE manual Macintosh Serial Port Pinouts, Mac Modem Description Din