Network Router User Manual

Terminal Pinouts 135
Signa
l Pin
ITU-TSS
Signal
Name
EIA
Signal
Name
Pin/Signal
Description
Direction
DTE-
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
Din 8
Modem
DB 25
Description
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