CA2545525A1 - Midspan power delivery system for reduced emissions - Google Patents

Midspan power delivery system for reduced emissions Download PDF

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Publication number
CA2545525A1
CA2545525A1 CA002545525A CA2545525A CA2545525A1 CA 2545525 A1 CA2545525 A1 CA 2545525A1 CA 002545525 A CA002545525 A CA 002545525A CA 2545525 A CA2545525 A CA 2545525A CA 2545525 A1 CA2545525 A1 CA 2545525A1
Authority
CA
Canada
Prior art keywords
connectors
power
midspan
power adapter
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002545525A
Other languages
French (fr)
Other versions
CA2545525C (en
Inventor
Josh Thomson
Edward Peter Gancarcik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitel Networks Corp
Original Assignee
Mitel Networks Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitel Networks Corp filed Critical Mitel Networks Corp
Publication of CA2545525A1 publication Critical patent/CA2545525A1/en
Application granted granted Critical
Publication of CA2545525C publication Critical patent/CA2545525C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0298—Arrangement for terminating transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling

Abstract

A midspan power adapter is provided for use in a balanced communication system, such as an Ethernet system, where differential signals are transmitt ed between two devices. The adapter passes data signals through, and provides power to an end device, such as an IP phone, with significantly less contribution to the electromagnetic emissions of the system than known midspan adapters. Balance and symmetry inherent in a structured cable can be maintained by a termination network connecting center taps of a transformer and the spare pairs of both the incoming and outgoing cable s to a common point. The adapter can provide power through unused wires (known as spare pair power) or by combining power with data signals (known as phantom feed). A common mode choke is included in the power feed to prevent noise currents fr om flowing through the power supply connections to earth ground, helping to minimize radiated noise.

Claims (10)

1. A midspan power adapter to power a powered device in a balanced cable system, the power adapter having a device side including device connectors and a system side including system connectors, and a power source provided between two spare pairs of the device connectors, the adapter comprising:
a common mode choke connected inline between the power source and the spare pairs of the device connectors;
a transformer to isolate the device connectors and the system connectors, the transformer having device side terminals connected to signal pairs of the device connectors and system side terminals connected to signal pairs of the system connectors, and having first center taps and second center taps; and a termination network connected between non-signal connectors and a common point to provide common mode termination.
2. The midspan power adapter of claim 1 wherein the non-signal connectors comprise the first center taps of the transformer, spare pairs of the device connectors and spare pairs of the system connectors
3. The midspan power adapter of claim 2 wherein the non-signal connectors further comprise the second center taps of the transformer.
4. The midspan power adapter of claim 1 further comprising a phantom power common mode choke to provide power from a power supply to the second center taps on the transformer.
5. The midspan power adapter of claim 1 wherein the termination network includes a plurality of common mode terminations each having substantially similar resistance and capacitance values.
6. The midspan power adapter of claim 1 wherein the termination network includes a Bob Smith Termination.
7. The midspan power adapter of claim 5 wherein the resistance values are determined in accordance with pair-to-pair common mode impedance within a connector cable.
8. The midspan power adapter of claim 1 wherein the transformer is a 1:1 isolation transformer.
9. The midspan power adapter of claim 1 wherein the balanced cable system is an Ethernet system.
10. The midspan power adapter of claim 1 wherein the end device is an internet protocol (IP) device.
CA2545525A 2005-10-05 2006-05-02 Midspan power delivery system for reduced emissions Active CA2545525C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/242,857 2005-10-05
US11/242,857 US7813501B2 (en) 2005-10-05 2005-10-05 Midspan power delivery system for reduced emissions

Publications (2)

Publication Number Publication Date
CA2545525A1 true CA2545525A1 (en) 2007-04-05
CA2545525C CA2545525C (en) 2011-08-16

Family

ID=37566321

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2545525A Active CA2545525C (en) 2005-10-05 2006-05-02 Midspan power delivery system for reduced emissions

Country Status (3)

Country Link
US (1) US7813501B2 (en)
EP (1) EP1772989B1 (en)
CA (1) CA2545525C (en)

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US7971075B2 (en) * 2007-09-25 2011-06-28 Broadcom Corporation Four-pair midspan powering with a splitter in a power over ethernet application
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US8325500B2 (en) * 2010-07-13 2012-12-04 Eaton Corporation Inverter filter including differential mode and common mode, and system including the same
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KR101428199B1 (en) * 2012-10-22 2014-08-07 엘지이노텍 주식회사 The common mode filter and the power supply device having the same
CN103794190B (en) * 2012-10-26 2016-08-10 纬创资通股份有限公司 There is the attachment means of electro-static discharge protection function
CN106330466B (en) * 2015-07-10 2019-05-17 富士康(昆山)电脑接插件有限公司 Ethernet receiving end circuit and the RJ45 connector for applying it
US10148447B1 (en) * 2015-09-29 2018-12-04 Apple Inc. Provision of power over a data interface using a separate return path
DE102015219666B4 (en) * 2015-10-12 2023-02-16 Robert Bosch Gmbh Communication system for a battery management system for a battery and method for operating at least one predetermined coupling network of such a communication system
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Also Published As

Publication number Publication date
EP1772989A2 (en) 2007-04-11
EP1772989B1 (en) 2013-11-27
US20070077819A1 (en) 2007-04-05
US7813501B2 (en) 2010-10-12
CA2545525C (en) 2011-08-16
EP1772989A3 (en) 2012-04-18

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