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How to convert T1 DB9 to RJ45 cable? 2

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luddyspence

Technical User
Jan 30, 2008
185
CA
How can I convert a DB9 connector to a RJ45 connection?

The Notel PBX has a DB9 connector for the T1, but the PBX will be removed and the same T1 circuit will be used with a RJ45 connector. I want to make up a cable with a DB9 end and the other end will have a RJ45 end. What should the pin out be, for the DB9 end? A diagram would be helpful if possible.
 
If you are removing the PBX then why do you need the DB9? You can also get an RJ45 to DB9 adaptor. I know the DB9 uses pins 1, 3, 9, & 11 I just can not remember where they go to the RJ plug, I think it was 1, 2, 4 & 5.
 
Depends on if you need a cross over cable or not.

Look again before you cut over. You will need a DB15 connector not a DB9

Option 1

DB 15 RJ
1 1
9 2
3 4
11 5

Option 2

DB 15 RJ
1 4
9 5
3 1
11 2

I have had to use either option on various sites

Signature===========================================

Aastra Authorized Reseller
 
Are you sure you are not talking about a DB15 connector? As Hawks says, a DB15 connector uses pins 1, 3, 9, and 11. The RJ45 part uses 1,2,4,5.

War Eagle!
Lions Baseball '09!
 
Yes, it is a DB15 T1 connector. The PBX will be replaced with a VoIP solution and so the T1 circuit will be used on non-pbx equipment.

When would I use option 1 or option 2 pin out?

 
You would have to look up the pinouts for both and see if it is transmit or receive and wire accordingly. I usually have one of each and try them until one works and then make the rest to match.

Signature===========================================

Aastra Authorized Reseller
 
in tpmans wiring scheme, opt 1 is with a csu, 2 is without.. but as posted, build both and see which one greens it up..

hint: not sure if your counting the pins right? loop one and two to four and five (rj) that will bring it up to a loop.. so will pins 1 and 3 to 9 and 11 or the db side..


from the smart jack.. pins 1&2 are common as well as pins 4 and 5... inside of the smart they are the same conductor..

john poole
bellsouth business
columbia,sc
 
Can anyone verify the colours for the RJ45 pinouts from the DB15 conector?
Is this cirrect for the RJ45 side:
1 is blue
2 is orange
4 is red
5 is green
 
1 red
3 org
9 green
11 blue

patch pannel CAT5 to back of PBX DB15 Duel PRI card

(pinout is diff if for a dialer audio path)

Mato' Was'aka
 
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