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Huawei Sx700 Series Switches UPOE+ Technology White Paper Issue 01 Date 2016-02-27 HUAWEI TECHNOLOGIES CO., LTD. Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd. Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. 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Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China Website: http://e.huawei.com Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. i Huawei Sx700 Series Switches UPOE+ Technology White Paper Contents Contents 1 Overview......................................................................................................................................... 1 2 Implementation ............................................................................................................................. 3 2.1 PoE Power Supply Modes ............................................................................................................................................ 3 2.2 PD Power-on Process.................................................................................................................................................... 6 2.3 Product Capability ........................................................................................................................................................ 7 3 Typical Networking ...................................................................................................................... 8 A Abbreviations ............................................................................................................................... 9 Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. ii Huawei Sx700 Series Switches UPOE+ Technology White Paper 1 Overview 1 Overview Power over Ethernet (PoE) is a technology that provides power on the 10BASE-T, 100BASE-TX, 1000BASE-T, 2.5GBASE-T, or 10GBASE-T Ethernet at a distance of up to 100 m. It can be used to effectively provide centralized power for terminals such as IP phones, WLAN Access Points (APs), chargers of portable devices, POS machines, cameras, and data collection devices. This eliminates the need for separate cabling for power supply and powers on these devices when they connect to the network. A PoE system consists of power sourcing equipment (PSE) and powered devices (PDs). A PSE provides power, and a PD receives power from a PSE. As shown in Figure 1-1, the PoE switch functions as a PSE, and terminals such as IP phones, WLAN APs, and cameras are PDs. Figure 1-1 Diagram of a PoE system PoE Switch PSE PD IP phone WLAN AP IP camera PC TV PoE technology facilitates installation and management, and ensures security and stability. It is widely used in scenarios such as home applications, WLAN construction, security protection, retail, and entertainment. The PoE function complying with IEEE 802.3af provides a maximum of 15.4 W power. The PoE+ function complying with IEEE 802.3at provides a maximum of 30 W power. Emerging service types and new terminals require higher input power. To meet this requirement, Huawei developed the next-generation Universal Power Over Ethernet Plus (UPOE+) switch in compliance with IEEE 802.3bt. The UPOE+ function provides up to 90 W output power, Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 1 Huawei Sx700 Series Switches UPOE+ Technology White Paper 1 Overview meeting more terminals' power requirements. The following table describes detailed performance parameters of PoE, PoE+, and UPOE+ functions. Category PoE PoE+ UPOE+ Standard IEEE 802.3af IEEE 802.3at IEEE 802.3bt (draft) Power supply distance 100 m 100 m 100 m Classification 0-3 0-4 0-4 Maximum current 350 mA 720 mA 960 mA PSE output voltage 44-57 V DC 50-57 V DC 50-57 V DC PSE output power <=15.4 W <=30 W <=90 W PD input voltage 36-57 V DC 42.5-57 V DC 42.5-57 V DC Maximum power of PD 12.95 W 25.5 W 81.6 W Cable requirement Unstructured CAT-5 or better CAT-5 or better Number of power line pairs 2 2 4 Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 2 Huawei Sx700 Series Switches UPOE+ Technology White Paper 2 Implementation 2 Implementation 2.1 PoE Power Supply Modes A PoE power supply system consists of PSE and PDs. PoE standards define two methods of transporting direct current (DC) power to PoE devices over Ethernet cables: midspan and endpoint. Midspan The PoE module is installed outside a switch, and is deployed between a common switch and network terminals. The PoE module provides power for the terminals over network cables. A midspan PSE is a dedicated power management device and is usually deployed together with the switch. Each port on a midspan PSE has two RJ45 jacks. One is connected to the switch using a short cable, and the other is connected to a remote device. Endpoint The PoE module is integrated into a switch, which saves dedicated cables and devices deployed for independent power transmission. Huawei switches support built-in PoE modules and are endpoint PSEs. The following introduces the endpoint mode of power supply. Standard category 5 or higher category cables have four twisted pairs. IEEE80 2.3af defines the power interface (PI), which is used by PSEs and PDs to connect to network cables. PI supports two power supply modes: Alternative A (line pairs 1/2 and 3/6) and Alternative B (line pairs 4/5 and 7/8). PSE supports only one power supply mode. However, PDs must be able to adapt to the two power supply modes simultaneously. On 10BASE-T and 100BASE-T ports, two line pairs are used to transport data. That is, line pairs 1/2 and 3/6 are signal cables, and line pairs 4/5 and 7/8 are idle cables. Huawei switches support only the Alternative A mode. That is, these switches support only power supply over signal cables. As shown in Figure 2-1, signal cables (line pairs 1/2 and 3/6) are used to transport data and power simultaneously. When signal cables are used to supply power, DC power supply can be connected to the midpoint of the transformer. Line pair 1/2 then connects to the positive (or negative) polarity, and line pair 3/6 then connects to the negative (positive) polarity. Data and DC power are transmitted over a single pair of lines. DC power and data frequency are independent; therefore, the transmission of DC power does not affect data transmission. Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 3 Huawei Sx700 Series Switches UPOE+ Technology White Paper 2 Implementation Figure 2-1 Line pair connection on 10BASE-T/100BASE-TX ports On 1000BASE-T and 10GBASE-T ports, all the four line pairs are used to transport data. Both Alternative A and Alternative B modes transmit power on data transmission line pairs. Huawei switches support only the Alternative A mode, in which signal line pairs 1/2 and 3/6 transmit both data and power, as shown in Figure 2-2. Figure 2-2 Line pair connection on 1000BASE-T/10GBASE-T ports In PoE and PoE+ modes, a PSE uses two line pairs to provide 15.4 W and 30 W output power, respectively. In the UPOE+ mode, four line pairs on a single port are all used to transport PoE power. The connections of line pairs 1/2 and 3/6 in the UPOE+ mode are the same as that in PoE and PoE+ modes. Line pairs 4/5 and 7/8 are also used to transport power. Line pair 4/5 connects to the negative polarity, and line pair 7/8 connects to the positive polarity. Each two line pairs (1/2 and 3/6, or 4/5 and 7/8) provide 45 W power. Therefore, a PSE can provide a total of 90 W power. Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 4 Huawei Sx700 Series Switches UPOE+ Technology White Paper 2 Implementation Figure 2-3 shows power line connections on 10BASE-T or 100BASE-T ports in the UPOE+ mode. Signal pairs 1/2 and 3/6 provide 45 W power, and idle pairs 4/5 and 7/8 also provide 45 W power. The PD receives power from these four line pairs. Figure 2-3 Line pair connection on 10BASE-T/100BASE-TX ports Figure 2-4 shows power line connections on1000BASE-T or 10GBASE-T ports in the UPOE+ mode. Line pairs 1/2 and 3/6 provide 45 W power, and line pairs 4/5 and 7/8 also provide 45 W power. The PD receives power from these four line pairs. Figure 2-4 Line pair connection on 1000BASE-T/10GBASE-T ports A 2.5G electrical port on Huawei UPOE+ switches supports UPOE+ and provides 90 W output power. Line pairs 1/2 and 3/6 provide 45 W power, and line pairs 4/5 and 7/8 also provide 45 W power. Figure 2-5 shows the output power of PoE/PoE+ and UPOE+. Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 5 Huawei Sx700 Series Switches UPOE+ Technology White Paper 2 Implementation Figure 2-5 PoE/PoE+/UPOE+ power output diagram 2.2 PD Power-on Process Figure 2-6 shows how a PD obtains power supply when connecting to a PSE system. Figure 2-6 PD power-on process Detection Classification Power-on Operation (PM/RTP) Disconnection The power-on process is divided into the following phases: 1. Detection: The PSE checks whether a PD exists. The PSE checks whether a PD is connected by transmitting a low voltage to detect the capacitive resistance between power output line pairs. In detection phase, the output voltage ranges from 2.8 V to 10 V, and the voltage direction is the same as -48 V voltage output. The PSE proceeds to the next stage only when a PD is detected. The following situations indicate presence of a PD: 2. − The DC resistance ranges from 19 kohm to 26.5 kohm. − The capacitance is less than or equal to 150 nF. (Optional) Classification: The PSE determines the power consumption of the PD. The PSE obtains the power level of the PD according to the output current. In classification phase, the output voltage on a port ranges from 15.5 V to 20.5 V. The voltage direction is the same as -48 V voltage output. 3. Power-on: The PSE provides power for the PD. When the downstream device connected to the port is a valid PD and the PD is classified into a category (optional), the PSE delivers -48 V voltage to the PD. Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 6 Huawei Sx700 Series Switches UPOE+ Technology White Paper 2 Implementation 4. RTP & PM (real-time performance, power management) 5. Disconnection: The PSE detects whether the PD is disconnected. The PSE detects whether the PD is disconnected. If the PD is disconnected, the PSE shuts down the port to stop providing power. The port enters the detection state. Figure 2-7 shows the ideal output voltage waveform for the PSE power supply system. Figure 2-7 Waveform for PoE output voltage 2.3 Product Capability The S5720-14X-PWH-SI-AC switch supports UPOE+. It provides the following ports: Eight GE electrical ports. These ports support PoE+ and provide 30 W output power. Four 2.5GE electrical ports, which can be used as 1000M/100M ports. These ports support UPOE+ and provide 90 W output power. Two 10GE SFP+ optical ports, which are used on uplinks. Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 7 Huawei Sx700 Series Switches UPOE+ Technology White Paper 3 Typical Networking 3 Typical Networking As shown in Figure 3-1, UPOE+ switches are deployed at the access layer to provide power for various terminals. Since a UPOE+ switch provides 90 W output power per port, it allows more types of high-power terminals. Figure 3-1 Typical network deployment DC Egress router Radius DHCP server Firewall CSS S12700/S9700/S7700 Core layer L3 routing L2 switching UPOE+ switch S5720-14X-PWH-SI-A C Access layer IP phone Issue 01 (2016-02-27) WLAN AP IP camera Printer Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. 8 Huawei Sx700 Series Switches UPOE+ Technology White Paper A Abbreviations A Abbreviations Full Name PoE Power over Ethernet PoE+ Power over Ethernet Plus UPOE+ Universal Power Over Ethernet Plus PSE Power Sourcing Equipment PD Powered Device Issue 01 (2016-02-27) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd. Abbreviations 9