Serial interfaces cables and converters scheme  > Cisco pinouts
DCE-DTE Serial Cable Between Cisco Routers (X.21 Format)
Serial Port on Cisco Router
Pin Name
Serial Port
on Cisco Router
Pin Number
DirectionSerial Port
on Cisco Router
Pin Number
Serial Port
on Cisco Router
Pin Name
Description
Ground 46 <--> 46 Ground Shield Ground
TXD/RXD+ 11 --> 28 RXD/TXD+ Twisted Pair No.3
TXD/RXD- 12 --> 27 RXD/TXD- Twisted Pair No.3
RTS/CTS+ 9 --> 1 CTS/RTS+ Twisted Pair No.2
RTS/CTS- 10 --> 2 CTS/RTS- Twisted Pair No.2
RXD/TXD+ 28 <-- 11 TXD/RXD+ Twisted Pair No.4
RXD/TXD- 27 <-- 12 TXD/RXD- Twisted Pair No.4
CTS/RTS+ 1 <-- 9 RTS/CTS+ Twisted Pair No.1
CTS/RTS- 2 <-- 10 RTS/CTS- Twisted Pair No.1
RXC/TXCE+ 26 <-- 24 TXC/RXC+ Twisted Pair No.5
RXC/TXCE- 25 <-- 23 TXC/RXC- Twisted Pair No.5
Ground 15 <--> 15 Ground Circuit Ground
To Local 47 48 -?- 48 To Local 47 Ground Mode 2
To Local 48 47 -?- 47 To Local 48 Ground Mode 2
To Local 52 51 -?-     Ground Mode DCE
To Local 51 52 -?-     Ground Mode DCE
Not Used 16 -?- 16 Not Used Not Used

This was deduced from two X.21 cables hooked back to back. For DCE side I had to add 2 extra wires (Pins 25,26) not used in X.21, and swapped most pin pairs. I currently use this cable between a Cisco 2520 and a Cisco 1601 at 1.5 Mb/sec.

60 pin Cisco DB connector layout
60 pin Cisco DB connector
at the Serial Port on Cisco Router
60 pin Cisco DB connector layout
60 pin Cisco DB connector
at the Serial Port on Cisco Router
According to 3 reports in our database (1 positive and 2 negative) this pinout may be incorrect.

Is this pinout
Cisco DB-60 to DB-60 visual pinout:
Cisco DB-60 to DB-60  diagram
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