Ring Communications DNB100 - Manual (Page 7)

September 2004 DIGITAL NETWORK BRIDGE DNB100
F7 RING COMMUNICATIONS INC.
J2 - 9 pin (DB9) RS232 signals :
A null-modem (LapLink) cable can be used to connect two DNB100's together if the DNB100's are
close enough to each other. Two modems for leased line operation can be used to increase the
distance between two bridges.
If you are going to make your own cable the following is a description of the pinouts of the DB9
connector on the DNB100. The RS232 cable should not exceed 50 feet in length.
J2 SIGNAL DIRECTION/
PIN# NAME DESIGNATION
1 DCD Data Carrier Detect, input.
2 RXD Receive Data, input.
3 TXD Transmit Data, output.
4 DTR Data Terminal Ready, output.
5 GND Signal Ground.
6 DSR Not used.
7 RTS Request to Send, output.
8 CTS Clear to Send, input.
9 RI Not connection.