Nortel CTA 500dm Installation Manual page 84

84 Appendix
DB-25 and DB-9 signal summary
CTA 500 dm On Line Guide
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 RS-232
pin function
1 Shield
2 Transmitted Data
3 Received Data
4 Request to Send/Ready for Receiving
5 Clear to Send
6 DCE Ready
7 Signal Common
8 Received Line Signal Detector
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
22 Ring Indicator
23 Data Signal Rate Selector (DCE/DTE Source)
24 Transmitter Signal Element Timing (DTE Source)
25 Test Mode
CTA 500 dm
function
Shield
TD
RD
RTS
CTS
DSR
GND
DCD
–
–
–
–
–
–
DTR
RI
–
no
no
P0873832 Issue 05