ITL - Internet Teaching Laboratory

Cables and Connectors

Connector Pin Numbering

For these pin numbers you are looking at the connection end of the connector with the cable extending away from you on the other side of the connector.

DB9 female DB9 male 
5  4  3  2  1
 9  8  7  6        
      
1  2  3  4  5
 6  7  8  9

DB25 female DB25 male 
 1   2   3   4   5   6   7   8   9   10  11  12  13
  14  15  16  17  18  19  20  21  22  23  24  25
      
13  12  11  10   9   8   7   6   5   4   3   2   1
  25  24  23  22  21  20  19  18  17  16  15  14

RJ45 female (notch towards the bottom) RJ45 male (notch towards the bottom) 
 1   2   3   4   5   6   7   8
      
8   7   6   5   4   3   2   1

Adapters Pin Connections

DB9 female -> RJ45 female 
 1
 2
 3
 4
 5
 6
 7
 8
 9
      
-
6
3
2
4,5
7
1
8
-
RJ45 female -> DB9 female 
 1
 2
 3
 4
 5
 6
 7
 8
 
      
7
4
3
5
5
2
6
8

DB25 female -> RJ45 female 
1
2
3
4
5
6
7
8
...
20
...
      
-
3
6
1
8
7
4,5
-

2
RJ45 female -> DB25 female 
1
2
3
4
5
6
7
8



      
4
20
2
7
7
3
6
5

DB25 male -> RJ45 female 
1
2
3
4
5
6
7
8
...
20
...
      
-
6
3
-
-
-
4
2

7
RJ45 female -> DB25 male 
1
2
3
4
5
6
7
8



      
-
8
3
7
-
2
20
-

Pin Functions for Devices and Standards

T568A pin wire color function 
1
2
3
4
5
6
7
8
      
white/green
green
white/orange
blue
white/blue
orange
white/brown
brown
      
RecvData+
RecvData-
TxData+



TxData-
T568B pin wire color function 
1
2
3
4
5
6
7
8
      
white/orange
orange
white/green
blue
white/blue
green
white/brown
brown
      

TxData+
TxData-
RecvData+

RecvData-

RS232 DB9 PC pin function 
1
2
3
4
5
6
7
8
9

      
Data Carrier Detect (DCD)
Receive
Transmit
Data Teminal Ready (DTR)
Signal Ground
Data Set Ready (DSR)
Request to Send (RTS)
Clear to Send (CTS)
Ring Indicator
RS232 DB25 PC pin function 
1
2
3
4
5
6
7
8
20
22
      
Protective Ground
Trasmit
Receive
Request to Send (RTS)
Clear to Send (CTS)
Data Set Ready (DSR)
Signal Ground
Data Carrier Detect (DCD)
Data Terminal Ready (DTR)
Ring Indicator
      

TxData+
TxData-
RecvData+

RecvData-

Cisco 2900 Console Port (DTE) function 
1
2
3
4
5
6
7
8
      
RTS
-
TxD
GND
GND
RxD
-
CTS

Xyplex Port function 
1
2
3
4
5
6
7
8
      
CTS/RING
DTR
XMT
XMTGND
RCVGND
RCV
DCD
RTS

Cisco 2900 Pigtail Converter RJ45 male
black cable and black female 		RJ45 female 
1
2
3
4
5
6
7
8
      
8
2
3
4
5
6
7
1
These pigtails are used to connect a Xyplex terminal
server to a Cisco 2900 console port provided the
terminal server is working and can provide
RTS and CTS signals on pings 1 and 8.

Cisco 2900 Pigtail Converter RJ45 male
grey cable and white female 		RJ45 female 
1
2
3
4
5
6
7
8
      
tied to 8
2
3
4
5
6
7
tied to 1
These pigtails are used to connect a Xyplex terminal
server to a Cisco 2900 console port when the
terminal server is broken and cannot provide
RTS and CTS signals on pings 1 and 8. In this case
the RTS and CTS lines from the Cisco 2900
must be tied together inside the female connector.

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