Black Box 24 port User Manual
Black Box Console Server user guide
140
Modems
Direct connections
Modems; example connections,
Notes:
1. At the modem, signal RXD is received data from the PSTN; signal TXD is
transmitted data to the PSTN.
2. In addition to the signals shown in the examples above, you may connect
Protective Ground (P/GND) if you have shielded twisted-pair (STP) cable.
Connect P/GND at either your equipment or the Black Box device (but not both).
P/GND will reduce interference in noisy environments.
Connect P/GND at either your equipment or the Black Box device (but not both).
P/GND will reduce interference in noisy environments.
B l a c k
B o x
d e v i c e
M o d e m
R S 2 3 2
R J 4 5
D B 2 5
R X D
6
< — — — — — — — —
3
R X D
T X D
5
— — — — — - - — >
2
T X D
R T S
8
< — — — — — — — —
5
C T S
C T S
7
— — — — — - - — >
4
R T S
D S R
2
— — — — — - - — >
2 0
D T R
S / G N D
4
— — — — — — — -
7
S / G N D
D C D
1
< — — — — — — — —
8
D C D
D T R
3
< — — — — — — — —
6
D S R