JetPoE Series consists of Managed and Unmanaged PoE switches, delivering up to 30 watts via RJ45 cable while it transmits the data. All PoE are designed for industrial environment with wide operating temperatures, anti-shock, IP31, 1200V HiPot and fanless. A number of superior features are highlighted below:
Industrial PoE Challenges
Rather than using commercial PoE apparatus to deploy PoE in industrial environments, various kinds of challenges need to be considered. Any carelessness may result in system failure, device damage or economical loss. A number of issues are highlighted below when adopting PoE in an industrial environment.
Reliability-Reliability is a necessity for industrial usages. It is critical for industrial applications remains running. Any single point failure may need to be recovered in a short time. Aside from the network reliability, which is discussed in Ethernet environment, the demand for stability and reliability to supply power is raising because of power and data integration into a single infrastructure. The reliability of supplying power can be further explained below:
• PSE Reliability: Acting as a power source, a PSE applies power to one or more PDs. A single PSE failure may lead to a number of PDs shut down. As a result, both the reliability of PSE itself and its power input become two critical points to which must be given thought. Basically, the PSE should stay stable under its most unfavorable operating condition, such as temperature, humidity, vibration, shock, and so on.
A stronger PSE may further equip with self protection mechanisms for undetected system failure. As to the power input, it can be enhanced by supplying through an UPS system or by other means to avoid from sudden disconnection.
• PD Reliability: The design of PD may be harden as described in PSE reliability to sustain harsh industrial conditions. However, a smart PSE may help to detect whether the PD is still alive. A detection of loss or failure event of PD can be reported to IT staffs by various management mechanisms, such as email, alarm, SNMP traps. The IT staffs then can take proper actions on the failure event. It is possible that a more advanced PSE, which provides a management option of resetting the power connection, could bring the PD back to alive in a timelier manner.
Diverse Output Voltage-Just like various control systems, such as Modbus, ProfitNet, DeviceNet, used in different industrial applications, the power voltage required by each industrial application may vary. Take public transportation as an example, the power supply system is usually DC 24V, which does not fall in the range, from 44VDC to 57VDC, defined in the IEEE802.3af standard. In the circumstances, an additional voltage transformer may solve this problem. However, it may not meet the requirements for some particular reasons, such as costs, space limitation and so on. Being able to feed a wider range of power voltage from the PSE would be a more direct solution. This becomes another challenge for the PSE manufacturers to achieve the needs for diverse industrial applications.
Ultra Power Demand and Max Power Limitation- Driven by the benefits and the evolution of the technology, more and more PDs consuming high power are coming to the market. WiMax base stations and PZT cameras are such kind of products already seen today. While the demand of high power is considered when arrange to go to PoE technology, it should be note that the amount of power drawn by the PD must not cause any damages to the PSE, the cable, or the PD itself. Power delivery generates heat and bundling of the cables may exacerbate the heating problem. For safety concern, if either PSE or PD is not well designed to comply with the standard, the power delivery should be well controlled by some means to avoid overheating.
Potential Problem of DC Disconnect-There may be PD products designed to enter sleeping mode to save power if it has been on idle for a while. In power saving mode, the power consumption becomes low. However, there is a case that if the power draw goes below the DC disconnect threshold, the PSE judges the PD removal and will start DC disconnect process and stop delivering power. The PD is then turned off and can never be woken up by its event triggers.
The problem may not be limited to power saving mode. A PD designer should be aware of this potential problem, and it is also recommend that a PSE provides some mechanisms to prevent unexpected DC disconnect in order to ensure the stability and reliability for industrial PoE applications.
Wide-Ranged Operation Temperature-Industrial devices are often located at outdoors or in control rooms, where could be extreme cold or hot, and humid. A well designed industrial grade PoE device should be able to operate under harsh conditions. In particular, feeding power generates heat. The more power delivers, the higher the operation temperature of the PoE device raises. Surroundingwith the ambient heat in the environment, the high temperature circumstances may get from bad to worse. The tolerance of high temperature and overheat protection are two important points of industrial PoE.
Advanced Monitoring and Management-In industrial environments, it may not be enough to power on a PoE device and let it go by itself. Advanced monitoring and management on each PD, PSE or even on each port of a PSE are important to IT staffs for many system maintenance requirements. For example, by polling the amount of real-time power delivering on each port of a PSE helps to monitor the current status and to have an idea of the trend of the PoE port. Abnormal conditions, such us power cut, over feeding or under supplying, can then be possibly observed in advance to prevent errors.
Error detection can be also achieved by eventtrigger approach. By setting a certain circumstance of threshold, any irregular event exceeding the circumstance triggers a notification to IT staffs or results in a predefined action. Notifications can be in the form of alarm, email, SNMP trap or by other means. Accompanying with notifications, a predefined action can take place immediately for protecting or for recovering purposes before IT staff receives the notification and arrives for on-site service. Further more, detailed power control over a PoE system can also be used for security or power saving issues. Scheduling power control is one of the examples to save power and meet the economic resource utilization. Advanced monitoring and management which enhance the reliability, security and efficiency of a PoE system are essential parts for industrial environments.
PoE-Plus Capability: 30W High Power-In addition to IEEE802.3af standard, Korenix also supports IEEE802.3at pre-standard high power PSE solution for PDs which power requirements are greater than 15.4W. JetPoE switch series delivers up to 30 watts of high power, which can be used in high end demanding applications.
Bus/Railcar PoE-JetPoE series is designed with Korenix patented 24V to 48V vehicle PoE Boost technology to fulfill vehicle applications requiring exceptionally 24VDC power input. This makes the deployment of standard IEEE 802.3af PoE IP cameras feasible on bus, railcar and water vessel.
Forced Powering-Korenix provides advanced forced powering control to deliver power to those non-standard PoE devices that cannot be detected as valid PD's. In the early days PoE products that were circulating the market prior to the ratification of PoE standard 802.3af did not comply with the current standard and did not support PD detection and classification. The PoE switch cant recognized the PD, thus, it will not forward the power. The forced powering ability solves this problem and enables all your PD's.
Manual Power Limitation-Korenix allows users to manually configure the power limitation of the attached PD that doesn't support PD classification. This can be used to prevent over-power drawing by a non-standard PD and also provides over-heat protection in the event that power forwarding has been exceeded.
Redundant Power Supply-Korenix supports power input redundancy on your PSE, flexible solutions for those applications where a reliable power supply is critical. The backup power input will be enabled when the main input fails.
Smart Powered Device Alive-Check-Korenix PoE switches can be configured to monitor real-time status of connected PD's. Once the PD fails, it will reset the PoE port to bring the PD back to a working state. This greatly enhances the reliability that the PoE port will reset the PD power and reduces your management burden.
PoE Port Schedule-Korenix provides an hourly/weekly scheduling mechanism for advanced power control. Each PoE port can be configured as on/off by hourly basis. This feature meets economic power management, security, or customer-specific requirements.
Enhancement for Environmental Requirements-The PoE devices that are installed in industrial environments are often located in hot and humid storage rooms without air conditioning. The products must be anti-shock, offer a wider range of operation temperatures and be waterproof. The award-winning mechanical design of Korenix PoE switch series are your best solution for industrial graded applications.
Korenix Technology (korenix.com), a Beijer Electronics Group Company, is devoted to designing and manufacturing high quality Industrial Networking & Computing Products to ensure high quality and reliability of industrial networks.