![background image](/i/zyxel/147524/zyxel-omni-ta128/h/zyxel-omni-ta128-171.png)
159
Pin
Number
ITU-TSS
Signal
Name
EIA
Signal
Name
Signal/Pin
Description
Signal
Direction
DTE -DCE
line.
21
140
Remote Digital
Loop Test.
⇒
22
125
CE
Ring Indicator(RI).
⇐
24
113
DA
Transmit Clock
Signal (source:
DTE).
⇒
25
142
Test Indicator.
⇐
Async. Hardware Flow Control Cable Connection
Modem
to PC
to DCE
to
to NeXT
(DCE)
Signal
(DTE)
(Null)
MAC
68,040
DB25
DB 9
DB25
Mini 8
Mini 8
2
TXD
3
3
3
3
3
RXD
2
2
5
5
4
RTS
7
5
1
6
5
CTS
8
4
2
8
6
DSR
6
20
7
Ground
5
7
4,8
4
8
CD (DCD) 1
20
2
20
DTR
4
6,8
1
1
22
RI
9