Db-25 and db-9 signal summary – Nortel Networks CTA 500dm User Manual
Page 84
84 Appendix
CTA 500
dm On Line Guide
P0873832 Issue 05
DB-25 and DB-9 signal summary
The following tables show which DB-25 and DB-9 pins are used by
the CTA 500dm and what the signals are used for by the
CTA 500dm.
DB-25 connection
DB-25
pin
RS-232
function
CTA 500
dm
function
1
Shield
Shield
2
Transmitted Data
TD
3
Received Data
RD
4
Request to Send/Ready for Receiving
RTS
5
Clear to Send
CTS
6
DCE Ready
DSR
7
Signal Common
GND
8
Received Line Signal Detector
DCD
12
Secondary Received Line Signal/Detector/
Data Signal Rate Selector (DCE Source)
–
13
Secondary Clear to Send
–
14
Secondary Transmitted Data
–
16
Secondary Received Data
–
18
Local Loopback
–
19
Secondary Request to Send
–
20
DTE Ready
DTR
22
Ring Indicator
RI
23
Data Signal Rate Selector (DCE/DTE Source)
–
24
Transmitter Signal Element Timing (DTE Source)
no
25
Test Mode
no