What kind of power system AC or DC is required for voice and data communication?
areil 13-December-2008 09:23:55 PM
Comments


Telecom equipment works with DC power. The voltage levels are generally 48V or in a few cases 24V. A typical rectifier converts the AC utility power to 48 V DC, charging a bank of batteries usually designed for two to eight hours of critical protection from power outage.
Posted by sagitraz


telephonyonline.com/news/telecom_great_acdc_debate
Posted by crouse


www.liebert.com/topissue_pages/top_issues.aspx?x=voip
Posted by crouse


AC power system is required for voice and data communication.
Posted by eric


DC-48 V
Posted by HamidAliKhan


Telecom equipment works with DC power. The voltage levels are generally 48V or in a few cases 24V. A typical rectifier converts the AC utility power to 48 V DC, charging a bank of batteries usually designed for two to eight hours of critical protection from power outage. Since a battery bank is floated across the DC bus, to provide battery backup, the working voltage is in reality the float voltage of the battery. For VRLA batteries, the float voltage is typically 2.25V/cell or 54V for a 48V system and 27V for a 24V system. The positive in a 48V system is grounded, whereas in a 24V system, the negative is grounded. This difference is due to the practice adopted by the pioneering telecom equipment manufacturers, which is continuing today. In contrast to AC systems, DC systems do not require converting the source power from AC/DC and DC/AC.

From:http://voicendata.ciol.com/content/goldbook/goldbook03/103033111.asp
Posted by sagitraz


Posted: 14-December-2008 05:48:40 AM By: sagitraz

Telecom equipment works with DC power. The voltage levels are generally 48V or in a few cases 24V. A typical rectifier converts the AC utility power to 48 V DC, charging a bank of batteries usually designed for two to eight hours of critical protection from power outage. Since a battery bank is floated across the DC bus, to provide battery backup, the working voltage is in reality the float voltage of the battery. For VRLA batteries, the float voltage is typically 2.25V/cell or 54V for a 48V system and 27V for a 24V system. The positive in a 48V system is grounded, whereas in a 24V system, the negative is grounded. This difference is due to the practice adopted by the pioneering telecom equipment manufacturers, which is continuing today. In contrast to AC systems, DC systems do not require converting the source power from AC/DC and DC/AC.

From:http://voicendata.ciol.com/content/goldbook/goldbook03/103033111.asp

Posted: 15-December-2008 09:31:04 AM By: HamidAliKhan

DC-48 V

Posted: 15-December-2008 03:22:45 PM By: eric

AC power system is required for voice and data communication.

Posted: 15-September-2009 09:52:19 AM By: crouse

www.liebert.com/topissue_pages/top_issues.aspx?x=voip

Posted: 15-September-2009 09:53:53 AM By: crouse

telephonyonline.com/news/telecom_great_acdc_debate

Posted: 19-September-2009 03:33:44 AM By: sagitraz

Telecom equipment works with DC power. The voltage levels are generally 48V or in a few cases 24V. A typical rectifier converts the AC utility power to 48 V DC, charging a bank of batteries usually designed for two to eight hours of critical protection from power outage.