Rj45 To Db25 - Black Box 16-Port Rackmount 10/100 Installation Manual

12.2.1 RJ45 to DB25

If you are connecting an RJ45 port to a DTE device (such as a terminal) that has a DB25
connector, you will need to use an RJ45-DTE DB25 adapter. To connect an RJ45 port to a
DB25 connector on a DCE device, you will need an RJ45-DCE DB25 adapter. The pinout
information for both connections is shown in Figure 12-3.
The arrows in Figure 12-3 represent the direction of the signal. The pinouts assume that the
8-conductor cable connecting the Terminal Server and the adapter block is a swapped
cable. Both the transmit and receive ground signals on the Terminal Server connector are
wired to the signal ground on a DB25 adapter.
Figure 12-3: Pinouts of RJ45-DB25 Connections
Figure 12-4: RJ45 to DCE DB25 Adapter
DCE - DB25 Adapter Pinout
RJ45
Serial
Cable
RJ45
Port
(Server)
CTS
8 1
8
1
(in)
6
DSR
7
7 2
2
(in)
5
RX+
3
6 6 3
4
(in)
RX-
5 4
5 4
3
TX-
5
2 5
4 4
6
TX+
3 3 6
(out)
DTR 7
2 7
2
(out)
RTS
8
1
1 8
(out)
RJ45-DB25
Adapter
DB25
(modem)
5
CTS
8
DCD
3
RXD
7
SG
2
TXD
20
DTR
4
RTS
53