<h2 style="margin: 12px 0px; padding: 0px; border: 0px; vertical-align: inherit; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important; font-size: 20px;">BBU Working Principle</span></h2><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">A BBU consists of the following subsystems: baseband subsystem, power and mechanical subsystem, transmission subsystem, interconnection subsystem, main control subsystem, monitoring subsystem, and clock subsystem. Each subsystem consists of different modules, as listed in the following table.</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><strong style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit;">Table 1</strong>
Components of the BBU</p><figure class="table" style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; overflow-x: auto; width: 321pt; height: 278px; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255);"><table style="table-layout: fixed; border-collapse: collapse; width: 825px; max-width: 100%;"><tbody><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border: 1px solid rgb(221, 221, 221); padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: solid solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">Module</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Baseband subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">Baseband processing unit (BBP)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 23.5pt; width: 119pt;">Power and mechanical subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">Backplane, fan unit (FAN), and power and environment interface unit (PEU)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Transmission subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">Main processing and transmission unit (MPT)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Interconnection subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">MPT</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Main control subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">MPT</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Monitoring subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">PEU and environment interface unit (EIU)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14.5pt; width: 119pt;">Clock subsystem</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 202pt;">MPT and satellite card and clock unit (SCU)</td></tr></tbody></table></figure><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">The following figure shows the working principle of a BBU.</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><strong style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit;">Figure 2</strong>
Working principle of a BBU</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><img alt="Working principle of a BBU" src="https://forum.huawei.com/enterprise/api/file/v1/small/thread/667932740512780288.png?appid=esc_en" style="margin: 0px; padding: 0px; border-width: 0px; border-style: initial; vertical-align: middle; max-width: 100%;"></p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><h2 style="margin: 12px 0px; padding: 0px; border: 0px; vertical-align: inherit; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important; font-size: 20px;">BBU Function</span></h2><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">A BBU performs the following functions:</p><ul style="margin: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; list-style-position: inside; list-style-type: disc; border: 0px; vertical-align: inherit; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255);"><li style="margin: 0px 0px 0px 2em; padding: 0px; border: 0px; vertical-align: middle; word-break: break-word !important; line-height: 1.5;">Provides ports for connecting to the transmission equipment, RF modules, USB devices, external reference clock, and LMT or MAE to transmit signals, perform automatic base station software upgrade, receive reference clock signals, and support BBU maintenance on the LMT or MAE.</li><li style="margin: 0px 0px 0px 2em; padding: 0px; border: 0px; vertical-align: middle; word-break: break-word !important; line-height: 1.5;">Manages the entire base station system. The management involves uplink and downlink data processing, signaling processing, resource management, and operation and maintenance.</li></ul><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><h2 style="margin: 12px 0px; padding: 0px; border: 0px; vertical-align: inherit; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important; font-size: 20px;">BBU5900 Matching Boards</span></h2><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><strong style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit;">Table 2</strong>
lists the boards that can be used in the BBU5900.</p><figure class="table" style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; overflow-x: auto; width: 456pt; height: 374px; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255);"><table style="table-layout: fixed; border-collapse: collapse; width: 825px; max-width: 100%;"><tbody><tr><td colspan="2" style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border: 1px solid rgb(221, 221, 221); padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 456pt;">Matching Boards</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 42pt; width: 164pt;">Main control board</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">UMPTb1, UMPTb2, UMPTb3, UMPTb9, UMPTe1, UMPTe2, UMPTe3, UMPTg1, UMPTg2, UMPTg3, UMPTga1, UMPTga2, UMPTga3</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 70pt; width: 164pt;">Baseband processing board</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">UBBPd1, UBBPd2, UBBPd3, UBBPd4, UBBPd5, UBBPd6, UBBPd9, UBBPe1, UBBPe2, UBBPe3, UBBPe4, UBBPe5, UBBPe6, UBBPe18, UBBPg1, UBBPg1a, UBBPg2, UBBPg2a, UBBPg3b, UBBPg3, UBBPg4, UBBPei, UBBPem, UBBPex2, UBBPf1, UBBPf3, UBBPfw1</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 164pt;">Satellite-card board</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">USCUb18, USCUb16, USCUb14, USCUb11</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 164pt;">Fan module</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">FANf</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 164pt;">Power module</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">UPEUe</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 164pt;">Environment monitoring unit</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 292pt;">UEIUb</td></tr></tbody></table></figure><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><h2 style="margin: 12px 0px; padding: 0px; border: 0px; vertical-align: inherit; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important; font-size: 20px;">BBU5900 Equipment specifications</span></h2><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><strong style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit;">Table 3
</strong>BBU5900 Equipment specifications</p><figure class="table" style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; overflow-x: auto; width: 553pt; height: 472.719px; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255);"><table style="table-layout: fixed; border-collapse: collapse; width: 825px; max-width: 100%;"><tbody><tr><td colspan="2" style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border: 1px solid rgb(221, 221, 221); padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt; width: 553pt;">
Equipment specifications</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Power input type</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">–48 V DC</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Operating voltage</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">–38.4 V DC to –57 V DC</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Dimensions (H x W x D)</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">86 mm x 442 mm x 310 mm (3.39 in. x 17.40 in. x 12.20 in.)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Weight</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">18 kg (39.69 lb) in full configuration</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 28pt;">Typical power consumption</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 348pt;">check out the<br><a href="https://cpq.huawei.com/isales/cpq/index/#/themeHome/pct" target="_blank" rel="noopener noreferrer" style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; color: rgb(9, 135, 233); word-break: break-word !important;"><strong style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit;">Power Consumption Tool HW</strong></a></td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Operating temperature</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">Long-term operation: –20°C to +55°C (–4°F to +131°F)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Relative humidity</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">5% RH to 95% RH</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Ingress protection rating</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">IP20</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Altitude</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">≤ 4000 m (13123.36 ft)</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 28pt;">Noise sound power level</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; width: 348pt;">ETS 300 753 3.1<br>≤ 7.2 bels</td></tr><tr><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important; height: 14pt;">Storage time</td><td style="table-layout: fixed; overflow-wrap: break-word; word-break: normal; border-width: 1px; border-style: none solid solid none; border-color: rgb(221, 221, 221); border-image: initial; padding: 5px 10px; font-size: 16px; max-width: 890px; text-decoration: inherit !important;">Installed and used within one year</td></tr></tbody></table></figure><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important;">The site capacity specifications and signaling specifications need to be calculated based on the specific UBBP board model. Therefore, this section does not describe the calculation.</span></p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;">
</p><p style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-all; font-family: HuaweiSans, Arial,
quot;Microsoft YaHei
quot;, 宋体, Tahoma, Verdana, SimSun; font-size: 16px; background-color: rgb(255, 255, 255); line-height: 1.5;"><span style="margin: 0px; padding: 0px; border: 0px; vertical-align: inherit; word-break: break-word !important;">The differences between the BBU5900 series and the BBU3900 series are as follows: More powerful performance and support for 5G networks.</span></p>
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