POE受电设备 PD协议一致性 SIFOS测试 802.3 AF/AT/BT PD性能参数综合分析
POE测试,PD协议一致性,SIFOS测试,,802.3 AF/AT/BT PD,以太网测试服务
SIFOS PDA-604A是802.3 AF/AT/BTPD协议一致性测试仪，作为市场上被认可的商用协议一致性测试工具，可满足PD芯片/网络设备商 PD功能及实现是否符合802.3af/at/bt协议一致性要求，是一款用于测试IEEE 802.3bt和802.3at PoE供电设备的单机综合解决方案。
技术参数
PD Classification – 802.3at
802.3at specification allows for PD’s to communicate their powerdemands to a PSE port via a classification process. From theperspective of a PSE port, PD’s can be classified as follows:
A Type-1 PSE has the option not to classify the PD in which casethe PD must be assumed to require Class 0 power.
Classification is performed by applying a voltage in the bandfrom 15.5V to 20.5V and measuring the fixed DC current loadpresented by the PD. The magnitude of measured current is thentranslated into a classification as follows:
The PSE is free to make decisions regarding current measurementsthat fall between the above bands. Classification must be completedin 75 mSec, so typically classification involves a short durationpulse with amplitude between 15.5 and 20.5 Volts. A “single-event”class pulse (see Figure 2.6) may return to zero or may hold itsvalue (or anything in between) following completion ofclassification.
PD Classification – 802.3bt
The 802.3bt specification significantly extended the model of2-Event classification so that PSE’s and PD’s could signal newclassification bands that relate to power levels above Type-2(Class 4). As with 802.3at, classification is a process thatfollows PD detection and precedes PSE powering of the PD.
802.3bt introduced nine new PD classifications, four thatpertain to single signature PD’s and five that pertain to dualsignature PD’s. 802.3bt also retained 803.2at PD classifications1-4. As with 2-Event classification in 802.3bt, the count ofclassification pulses represents the method by which a PSEauthorizes power levels to a PD.
The following table describes the 13 possible PD classificationsdescribed in the 802.3bt specification.
Unlike 802.3at, 802.3bt requires that classification currentsdrawn by the newer classes of PD’s change after the first twoevents are completed. The change in class current then encodesinformation regarding the power the PD demands. This differenceenables 802.3bt PSE’s to differentiate between 802.3at PD’s wherethe classification signature never changes after the second classevent and 802.3bt PD’s where that signature always changes. Figure2.7 diagrams the relationship between PSE voltage and PD currentdraw during a 4-Event classification sequence.
PDA-604A 分析仪提供以下全面的PoE PD分析和验证主要功能：
支持所有802.3bt / 802.3at PD的4线对和2线对供电和分析
可配置的分类和802.3bt / 802.3at功率授权
所有PD输入电压下的连续PD功率>82瓦
802.3bt / 802.3at PD性能参数综合分析
自动化IEEE 802.3at *供电设备一致性测试套件
灵活的802.3bt / 802.3at LLDP仿真和LLDP协议分析
强大的计量：PD接口的电压，电流和功率采样
用于快速分析和测试的直观图形用户界面
适用于Microsoft Windows的强大脚本自动化和二进制API库
信息弹出电子表格报告和统计
即插即用USB接口，连接到Windows PC
测试期间用于外部PD配置和控制的LAN端口
集成的单盒解决方案
POE受电设备 PD协议一致性 测试服务 测试项目预览