Network Interface pinouts

Looking to add a T/phone interface to a board with a 5500CN already installed.

There is already a CAT5 cable in the board for the network interface.

My question is does the 5500CN use all 4 pairs of the cat5? or can i pluck a pair out of the existing CAT5 cable to use for phone interface?

If anyone can tell me what pins 1-8 on the 5500CN do?

Thanks

Grant

 

I assume this CAT5 is for the cbus? The telephone interface has two cbus ports on it so you should be able to plug the existing cbus CAT5 into one port and use a short CAT5 lead to go from the second port to the Network Interface.

If the CAT5 is for ethernet, what purpose do you need to connect it to the CBTI? Are you looking to run ethernet in combination with phone/serial on the one CAT5? .. sounds very iffy to me.

 

You need a port doubler

Hi,

Yes, you can use the spare pairs. Ethernet uses pins 1,2,3 & 6. Which leaves 4,5,7 and 8 available. The standard for a telephone line on RJ45 is to use pins 4 & 5.

You can buy a handy-dandy port doubler to do exactly what you need, or you can just make up your own cable using the pinouts on the linked page as a guide.

Paul

 

The answer is...

According to section 9.3.1 (page 39) of AS/ACIF S009:2006 Wiring Rules

ELV, SELV, TNV and limited current circuits may be carried in the
same cable (i.e. share the same cable sheath).

I believe that Ethernet is generally considered to be SELV.

This sort of thing is done routinely in commercial premises - a 200 pair cable is often run up the building riser as part of a structured cabling system with phone and data services then patched onto pairs as required.

Paul

 

Well maybe i did not explain myself properly. In the board i have a PINK cat 5 and a BLUE cat5.

The BLUE cable currently goes to Network interface. I want to put in a CBTI as well, does the network interface use only pins 1,2,3 & 6? I ask this as they (5500CN) have been around for a while (apparently older networks used an additional pair for a clock).

If only the 4 pins are used i (*should*) be able to use one of the spare pairs as a phone line.

I am hoping Paul is on the money!

Cheers

Grant