Hardware pinouts information and cables schemes

Cisco DB-60 to DB-60 pinout

serial interface cable

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DCE-DTE Serial Cable Between Cisco Routers (X.21 Format)

60 pin Cisco DB connector layout

60 pin Cisco DB connector
to the Serial Port on Cisco Router



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.


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60 pin Cisco DB connector diagram

60 pin Cisco DB connector
to the Serial Port on Cisco Router

Pinouts.ru > Serial interfaces cables and converters schemes listing >  Pinout of Cisco DB-60 to DB-60 and layout of 60 pin Cisco DB connector and 60 pin Cisco DB connector
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