196
6.1.2.Console Port to 9-Pin COM Port on PC Switch’s 9-Pin Serial
Port
CCITT Signal PC’s 9-Pin COM
Port
1 DCD ----------- DCD ------------ 1
2 RXD <--------- TXD ------------ 3
3 TXD ----------- RXD ----------> 2
4 DTR ----------- DSR ----------> 6
5 SGND ----------- SGND ---------- 5
6 DSR ----------- DTR ------------ 4
7 RTS ----------- CTS -----------> 8
8 CTS <--------- RTS ------------- 7
9 RI ----------- RI --------------- 9
6.1.3.Console Port to 25-Pin DCE Port on Modem Switch’s 9-Pin Serial
Port
CCITT Signal Modem’s 25-Pin DCE
Port
1 <--------- DCD ------------ 8
2 <--------- RXD ------------ 3
3 ----------- TXD ----------> 2
4 ----------- DTR ----------> 20
5 ----------- SGND ---------- 7
6 <--------- DSR ------------ 6
7 ----------- RTS -----------> 4
8 <--------- CTS ------------- 5
9 <--------- RI --------------- 22
6.1.4.Console Port to 25-Pin DTE Port on PC Switch’s 9-Pin Serial
Port
Null Modem PC’s 25-Pin DTE
Port
1 DCD 8 DCD
2 RXD 3 TXD
3 TXD 2 RXD
4 DTR 20 DTR
5 SGND 7 SGND
6 DSR 6 DSR
7 RTS 4 RTS
8 CTS 5 CTS
9 RI
1 1
2 3
3 2
4 8
5 20
6 7
7 4
9 5
20 6 22 RI