ZyXEL Communications ACCESSING INTERNET & INTRANET omni series User Manual
Page 165
Serial Port Interface 153
Pin
Number
ITU-TSS
Signal
Name
EIA
Signal
Name
Signal/Pin
Description
Signal
Direction
DTE -DCE
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
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