Picture of Simple RJ45  DB9 Cisco console cable

Hello everyone,

I just bought my first cisco router (2610) and, in order to learn about it I decide to start a blog. The idea its to provide a step-by-step from nothing to something that can be useful in a SOHO environment. The blog still in the very early steps, but it will be the experience of my interaction with my cisco router. here the URL: http://cisco4dummies.blogspot.com

I bought my router online (craigslist) and it came without the console cable. Looking around I found many articles talking about build your own cable but none as simple and easy as I wanted to be. Many articles describe adapter, mini cables, etc, and I was just looking for some straight, simple, easy do understand instructions.

This instructable is my attempt to provide the level of information I was looking for myself.

Remove these adsRemove these ads by Signing Up

Step 1: Getting Started - Bill of Material

Picture of Getting Started - Bill of Material

First we start with the parts:
  • Cat5e cable (mine has 6ft.);
  • 1 RJ45 Connector;
  • 1 DB9 Connector;
  • Crimp tool;
  • Soldering Iron.

Step 2: Crimping the RJ45 connector

Picture of Crimping the RJ45 connector

Lets start crimping the RJ45 connector. I personally use  TIA/EIA 568A wiring diagram to all my cables, so I will continue doing so:

If you never crimped a RJ45 before, please refer to this video:

(credit: video from cablesupply.com)

There are many videos/sites showing how to crimp.

Just make sure you follow, in this case, TIA/EIA 568A wiring diagram

Step 3: Connectiing the DB9

Picture of Connectiing the DB9

The following diagram shows how each cable, by color, should be connected:

CAT5                                DB9 Pin
Green-White                         8
Green                                     6
Orange-White                       2
Blue                                        5
Blue-White                            5
Orange                                   3
Brown-White                         4
Brown                                     7

The Blue/White and Blue must both connect to pin 5 on the DB9. Pins 1 and 9 are not connected.

This is the RS232 Pins assignment (for reference)

Pin 1 - Received Line Signal Detector (Data Carrier Detect)
Pin 2 - Received Data
Pin 3 - Transmit Data
Pin 4 - Data Terminal Ready
Pin 5 - Signal Ground
Pin 6 - Data Set Ready
Pin 7 - Request To Send
Pin 8 - Clear To Send
Pin 9 - Ring Indicator

Step 4: Done

Picture of Done

That's it. 

Cant be simpler than that.



MirosławS13 days ago
WeldonL3 months ago

We are the factory for FTDI USB TO RJ45 CONSOLE CABLE ,Our website


AlisterV6 months ago

Personally I've found these


to be easier and simpler. That way if you need a 1m cable or 10m cable you select the appropriate ethernet cable.

va2heb1 year ago

I just did it and it works perfectly! Thanks for the instructions.

multik843 years ago
Soldered this cable, thanks very much. But the reception from the device is, and not a command from the keyboard is not received.
janet_aj275 years ago
hi Mr.pcapelo, very interesting i'ble as i'm doin my CCNA and a friend of mine was askin me to make a console cable for his 2500 router for practicing. Thanks to you now i can clear my doubts. just 1 doubt regarding step 3 of your i'ble, you have mentioned DB9 pin 5 twice, i'm sure there's a typo there. cud you please clear my doubt??? Once again, GR8 i'ble God Bless
pcapelo (author)  janet_aj275 years ago
Hi, thank you for your message. No its not a typo. you have to connect cables blue and blue-white to pin 5. I found this info online, use to build my cable and everything works fine, so i decide to keep the pinage same. thank you again PC