Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page

Subscribe

Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

- ADTRAN Support Community
- :
- Discussion
- :
- Total Access
- :
- Total Access 900/900e Series
- :
- What is the maximum cable distance on a FXS port on a TA 908 or 924?

jisom

New Contributor

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

06-18-2015
11:31 AM

What is the maximum cable distance on a FXS port off of a TA 908 or 924?

1 Solution

Accepted Solutions

Anonymous

Not applicable

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Not the Solution
- Email to a Friend
- Report Inappropriate Content

06-23-2015
09:05 AM

Hello David,

The line length depends on the gauge of wire you are using. You cannot exceed 1200 ohms of resistance on the line and a phone usually has about 500 ohms, so you are left with 700 ohms total. If you are using 24 AWG wire, you have about 50 ohms of impedance or resistance added per 1000ft, if you are using 26 AWG wire, you have about 100 ohms of impedance or resistance added per 1000ft. So without bridge taps on the line, you can go about 14,000 ft with 24 AWG wire. This does not mean that the telephone and fax machine can match this length, but the ADTRAN is good up to pretty long distances.

I hope this helps.

Regards,

Geo

4 Replies

cj_

Valued Contributor

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Accept as Solution
- Email to a Friend
- Report Inappropriate Content

06-18-2015
12:53 PM

Re: What is the maximum cable distance on a FXS port on a TA 908 or 924?

I'm also interested in this answer, and unable to find much information on the matter.

Anonymous

Not applicable

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Not the Solution
- Email to a Friend
- Report Inappropriate Content

06-23-2015
09:05 AM

Hello David,

The line length depends on the gauge of wire you are using. You cannot exceed 1200 ohms of resistance on the line and a phone usually has about 500 ohms, so you are left with 700 ohms total. If you are using 24 AWG wire, you have about 50 ohms of impedance or resistance added per 1000ft, if you are using 26 AWG wire, you have about 100 ohms of impedance or resistance added per 1000ft. So without bridge taps on the line, you can go about 14,000 ft with 24 AWG wire. This does not mean that the telephone and fax machine can match this length, but the ADTRAN is good up to pretty long distances.

I hope this helps.

Regards,

Geo

cj_

Valued Contributor

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Accept as Solution
- Email to a Friend
- Report Inappropriate Content

06-23-2015
12:10 PM

Re: What is the maximum cable distance on a FXS port on a TA 908 or 924?

Useful info, thank you!

jisom

New Contributor

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Accept as Solution
- Email to a Friend
- Report Inappropriate Content

06-23-2015
01:07 PM

Re: What is the maximum cable distance on a FXS port on a TA 908 or 924?

Thanks for the useful information.I will test a TA 924 at about 4-5,000 feet and see wow it works.