web statisticsweb stats Business Phone Systems Tech Talk Forum - VOIP & Cloud Phone Help

Business Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
#550826 04/29/13 09:35 AM
Joined: Feb 2005
Posts: 1,037
Member
OP Offline
Member
Joined: Feb 2005
Posts: 1,037
First I am a telephone guy, I dont do security or alarms.
I have a customer that we just put in a new Toshiba and T1 with 6 digital lines out of an Adtran unit. Four lines go on the system, one for fax, and the other for alarm system. The alarm pad at the front flashes & chrips every 20 seconds, it did this before on the local copper lines too. The vendor stated the line shows a voltage drop is causing it and claim this issue is not a problem with the equipment.
Like I said Im a telephone guy but this seems like a equipment problem, they have no problems on the voice lines or faxing and nothing else is using the security line and we have switched lines that it uses and the problem still exists.

Anyone have any thoughts or suggestions?

Atcom VoIP Phones
VoIP Demo

Best VoIP Phones Canada


Visit Atcom to get started with your new business VoIP phone system ASAP
Turn up is quick, painless, and can often be done same day.
Let us show you how to do VoIP right, resulting in crystal clear call quality and easy-to-use features that make everyone happy!
Proudly serving Canada from coast to coast.

Joined: Jul 2001
Posts: 3,342
Likes: 10
Moderator-Avaya-Lucent, Antique Tele
*****
Offline
Moderator-Avaya-Lucent, Antique Tele
*****
Joined: Jul 2001
Posts: 3,342
Likes: 10
Check the on-hook voltage from the IAD. It may be lower than 48VDC, and the alarm is interpreting that as off hook without current flowing through the alarm circuitry. The alarm installer should be able to change settings on his side to compensate.

Joined: Aug 2004
Posts: 251
Member
Offline
Member
Joined: Aug 2004
Posts: 251
Not sure about the Adtran IAD's but on the Cisco IAD's you can change the "idle line voltage". The service provider would need to change it.

Joined: Sep 2006
Posts: 3,290
Member
*****
Offline
Member
*****
Joined: Sep 2006
Posts: 3,290
Quote
...it did this before on the local copper lines too.

That means that any discussion about changing voltages from channel banks is moot.

That means that there is something amiss in the alarm panel.

Have the alarm installer meet you at the site, wire in a known-working POTS line that has 48 volts on it, and see what happens.

Is the alarm panel programmed to expect to see 2 dial tones? Most commercial systems want both lines to be powered in order to operate correctly. Since you indicate that there is only one line (which is a violation, of course) try installing a second POTS line (or even a line from the channel bank) and see what happens. Or put the same dial tone on both RJ31X jacks just as a test.

Please keep us posted.

Last edited by Arthur P. Bloom; 05/02/13 06:11 PM.

Arthur P. Bloom
"30 years of faithful service...15 years on hold"

Joined: Feb 2005
Posts: 1,037
Member
OP Offline
Member
Joined: Feb 2005
Posts: 1,037
I will be going to site with or without alarm vendor who seems reluctant to meet. He claims that with a meter on either of the two lines that his equipment has that every 20 seconds the voltage drops to 7 volts? There is nothing else on these two lines except the Adtran 908e unit. He has placed DSL line filters in line on both lines as well according to the site contact. He has stopped the repetative beep to the entry pad by extending a timer? to 45 seconds if that makes sense. But warned them that if the line ever goes dead or becomes disconnected they wont know.
There is no POTS/Copper lines onsite.

Last edited by Toshiba Bob; 05/03/13 02:43 PM.
Joined: Sep 2005
Posts: 9,285
Likes: 6
Admin
*****
Offline
Admin
*****
Joined: Sep 2005
Posts: 9,285
Likes: 6
Give them the provider number and let them work it out it has nothing to do with your equipment.


Merritt

Business Telephones & Equipment + Commercial Audio/Video Products
Commercial Communications . . . Turner, Maine
If it was built after 1980 don't expect it to work right.
Joined: Sep 2006
Posts: 3,290
Member
*****
Offline
Member
*****
Joined: Sep 2006
Posts: 3,290
"...it did this before on the local copper lines too."

Sorry to repeat myself, but it is not a telephone-related issue, either copper, channel bank, or whatever (the "whatever" being you, for example.)

It is an alarm panel problem. Maybe the phone line voltage-check circuit in the panel is acting weird. Maybe you should put 48 volts DC at 25 mA (current limited from a good power supply) on the telephone line input and watch the voltage at the panel.



Arthur P. Bloom
"30 years of faithful service...15 years on hold"


Moderated by  metelcom 

Link Copied to Clipboard
Forum Statistics
Forums84
Topics94,262
Posts638,696
Members49,757
Most Online5,661
May 23rd, 2018
Popular Topics(Views)
211,098 Shoretel
187,710 CTX100 install
186,795 1a2 system
Newest Members
BPopilek, Rich F, LewisR, TDKs79, Buttinset
49,757 Registered Users
Top Posters(30 Days)
dexman 18
Toner 11
TDKs79 8
teleco 4
Who's Online Now
1 members (justbill), 208 guests, and 238 robots.
Key: Admin, Global Mod, Mod
Contact Us | Sponsored by Atcom: One of the best VoIP Phone Canada Suppliers for your business telephone system!| Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers. Sundance Phone System Forums - VOIP & Cloud Phone Help
©Copyright Sundance Communications 1998-2024
Powered by UBB.threads™ PHP Forum Software 7.7.5