Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Connecting FXO to FXO Interface

Hy guys,

I would like to know if there is any issue connecting two FXO interfaces in different Cisco routers 2611back to back, according the diagram below.

Cisco 2611 FXO interface< -------------->FXO interface Cisco 2611

My best guess is if the FXO works with a PBX maybe it can work well direct connected to another FXO, please correct me if I am wrong.

My concerning is around the compability of this type of connection.

Thanks a lot.

Regards

Milton

  • Other Collaboration Voice and Video Subjects
1 ACCEPTED SOLUTION

Accepted Solutions
Blue

Re: Connecting FXO to FXO Interface

No this would not work. A FXO is expecting to see ring voltage on an incoming call, and would never output ring. To place a call the FXO places a loop or ground on the line, which the other FXO would never detect. A good way to think about this is that a router FXS port acts like a PBX driving a phone, and a router FXO port acts like a phone connected to a PBX.

You could connect a FXO to an FXS, or better yet a 4wire E&M to another 4wire E&M.

1 REPLY
Blue

Re: Connecting FXO to FXO Interface

No this would not work. A FXO is expecting to see ring voltage on an incoming call, and would never output ring. To place a call the FXO places a loop or ground on the line, which the other FXO would never detect. A good way to think about this is that a router FXS port acts like a PBX driving a phone, and a router FXO port acts like a phone connected to a PBX.

You could connect a FXO to an FXS, or better yet a 4wire E&M to another 4wire E&M.

103
Views
0
Helpful
1
Replies
This widget could not be displayed.