ZyXEL Communications U-90E User Manual page 148

U-90E Data/Fax Modem
Signal ITU-TSS
Pin Signal Name
1 101
2 103
3 104
4 105
5 106
6 107
7 102
8 109
15 114
17 115
18 141
20 108/2
108/1
21 140
22 125
24 113
25 142
J
EIA Pin/Signal Description
Signal
Name
AA Protective Ground (GND).
BA Transmitted Data (TXD).
BB Received Data (RXD).
CA Request To Send (RTS).
CB Clear To Send (CTS).
CC Data Set Ready (DSR).
AB Signal Ground (GND).
CF Data Carrier Detected (DCD).
DB Transmit Clock Signal (source:
DCE).
DD Synchronous Receive Clock.
Local Analog Loopback Test.
CD Data Terminal Ready (DTR).
Connect DCE to line
Remote Digital Loop Test.
CE Ring Indicator(RI).
DA Transmit Clock Signal (source:
DTE).
Test Indicator.
Appendix B
EIA-232D Interface
Direction
DTE-DCE
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Glossary