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HUAWEI ME60 Multiservice Control Gateway V600R005C00 Hardware Description Issue Date 2012-11-15 HUAWEI TECHNOLOGIES CO., LTD.
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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.
About This Document Purpose This document describes the contents, related version, intended audience, conventions, and update history of the HUAWEI ME60 Multiservice Control Gateway Hardware Description. Related Versions The following table lists the product versions related to this document. Product Name...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description About This Document Symbol Description Indicates a hazard with a medium or low level of risk, which if not avoided, could result in minor or moderate injury. Indicates a potentially hazardous situation, which if...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description About This Document Change Types Board Name Description ME0D0EFGFB50 24-Port 100/1000Base-X- SFP Broadband Service Unit Integrated(BSUI-22) ME0D0L2XXB50 2-Port 10GBase WAN/LAN- XFP Broadband Service Unit Integrated(BSUI-22) ME0DE1XEBG50 1-Port 10GBase WAN/LAN- XFP+12-Port 100/1000Base- X-SFP Broadband Service...
2.1.1 System Overview............................5 2.1.2 System Architecture..........................6 2.1.3 System Features............................6 2.1.4 Components of the ME60-X16........................7 2.1.5 Slot Layout on the ME60-X16........................8 2.1.6 System Configuration..........................9 2.2 Power Supply System............................10 2.2.1 Architecture of the Power Supply System....................10 2.2.2 Distributed Architecture of the System....................10 2.2.3 DC Power Supply System........................11...
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3.1.1 System Overview.............................36 3.1.2 System Architecture..........................36 3.1.3 System Features............................37 3.1.4 Components of the ME60-X8........................38 3.1.5 Slot Layout on the ME60-X8........................39 3.1.6 System Configuration..........................40 3.2 Power Supply System............................41 3.2.1 Architecture of the Power Supply System....................41 3.2.2 Distributed Architecture of the System....................41 3.2.3 DC Power Supply System........................42...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description Contents 4.3 Heat Dissipation System...........................78 4.3.1 System Air Channel..........................78 4.3.2 Air Intake Vent............................79 4.3.3 Fan Module..............................80 4.3.4 Air Filter..............................81 4.3.5 Fan Speed Adjustment..........................81 4.4 Control Plane..............................82 4.4.1 Introduction to the Control Plane......................82 4.4.2 Main Processing Unit D2(ME0D00MPUD71)..................83 4.5 Physical Specifications.............................87...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description Contents 5.7 Physical Specifications...........................125 5.7.1 Chassis Specifications...........................125 5.7.2 Board Specifications..........................126 6 ME60-8 Chassis Overview....................... 129 6.1 Overview................................130 6.1.1 Device Structure............................130 6.1.2 System Configuration..........................132 6.2 Power Supply..............................133 6.2.1 DC Power Supply Module........................134 6.2.2 AC Power Supply Module........................137 6.3 Heat Dissipation System..........................139...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description Contents 7.7.5 Interface Attributes..........................174 7.7.6 Technical Specifications........................174 7.8 Flexible Card Versatile Service Unit 10 (VSUF-10)..................175 7.9 Integrated Versatile Service Unit 20 A (VSUI-20-A)..................177 7.10 Flexible Card Broadband Service Unit (BSUF-10,4 sub-slots)..............180 7.10.1 2-Port OC-12c/STM-4c ATM-SFP Flexible Card................183 7.10.2 4-Port OC-3c/STM-1c ATM-SFP Flexible Card................186...
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8.1 DC-Input Power Cable...........................376 8.1.1 ME60-X16 DC-Input Power Cable.......................376 8.1.2 ME60-X8 DC-Input Power Cable......................377 8.1.3 ME60-X3 DC-Input Power Cable......................379 8.1.4 ME60-16 5000W DC-Input Power Cable.....................380 8.1.5 ME60-16 8000W DC-Input Power Cable.....................381 8.1.6 ME60-8 DC-Input Power Cable......................382 8.2 AC-input Power Cable............................383 8.2.1 ME60-X16 AC-input Power Cable.......................383...
HUAWEI ME60 Multiservice Control Gateway (hereinafter referred to as the ME60), as an MSCG developed to meet the requirement for transformation, ensures security, reliability, and QoS for various telecommunication services. Based on the ME60 and its solutions, carriers can construct an intelligent carrier-class IP bearer network, transforming the IP network and shifting the traditional telecommunication services to the new network.
This section describes the system architecture, system features, components, slot layout and system configurations. 2.2 Power Supply System This chapter describes the power supply system used by the ME60. 2.3 Heat Dissipation System This section describes the appearance, functions, and specifications of the heat dissipation system.
The ME60-X16 has an integrated chassis, with main components which all support hot swapping. The ME60-X16 supports all the Line Processing Units (LPUs) on the former ME60, but the Main Processing Units (MPUs) and Switch and Fabric Units (SFUs) are new.
2 ME60-X16 Chassis Overview 2.1.2 System Architecture This section describes the system architecture. The ME60-X16 adopts a system architecture shown in Figure 2-2. In this architecture, the data plane, management and control plane, and monitoring plane are separated. This design helps to improve system reliability and facilitates upgrading of each plane separately.
Queries about alarm prompts, alarm indications, running status, and alarm status of the voltage and ambient temperature 2.1.4 Components of the ME60-X16 The ME60-X16 has an integrated chassis, with main components which all support hot swapping. Figure 2-3 shows the architecture and main components of the ME60-X16.
Slot number:On the ME60-X16, the slots of LPUs are numbered from 1 to 16. The slot number increases from left to right and from top to bottom, facing the front panel of the ME60 (there are corresponding marks on the panel).
HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Figure 2-5 Schematic diagram of the power supply for the ME60-X16 17 18 9 10 11 13 14 15 16 2.2.3 DC Power Supply System This section describes the appearance, functions, and technical parameters of the DC power supply module.
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The lightning protection link of the power module failed. l The power modules does not have input power. If the ME60-X16 has a DC power supply system, eight 70 A PEMs work in 4+4 backup mode. Figure 2-7 shows details of the DC power supply system.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Figure 2-7 Architecture of the ME60-X16 DC power supply system area 1 area 2 backplane DC a1 PEMA1 area 2 DC b1 PEMB1 DC a2 PEMA2 area 1 DC b2...
Figure 2-9 Rear view of the AC power supply system Figure 2-10 diagrams the AC power supply system of the ME60-X16. The input AC power is converted into regulated DC power by an AC/DC converter. The resulting DC power output is connected to the PEMs through external cables to supply power for all boards and fan modules.
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Figure 2-10, each DC power input contains one -48 V power input and one RTN input. Two separated RTN inputs are joined on the board. Figure 2-10 Architecture of the ME60-X16 AC power supply system area 1 area 2 AC1 AC2...
The middle area of the ME60-X16 is for SFU slots.The air intake vent of this area is located on the left of the chassis. Two upper SFU slots in the area draw in air from the left. When flowing to the right, the air joins the air from the upper chassis.
HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Figure 2-11 Air flow in the ME60-X16 2.3.2 Air Intake Vent This section describes the air intake vents. The ME60-X16 has three air channels. The upper and lower chassis have separate air channels that draw air from the front and exhausts air from the rear.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Two fan modules each containing one fan are located side by side at the air exhaust vent. If a single fan fails, the system can still work normally for a short period of time at ambient temperature of 40°C ( 104°F ).
2 ME60-X16 Chassis Overview 2.3.4 Air Filter The ME60-X16 draws in air from the front and exhausts air from the rear. The two air filters on the upper and lower chassis are identical. To maximize air intake, the filters are fully perforated.
The switching network responsible for switching data between LPUs is a key component of the ME60. The ME60 uses switching chips developed by Huawei and Memory-Crossbar-Memory (M-C-M) to provide a three-level switching mode. Level-1 and level-3 switching use a shared- memory model and are performed on LPUs;...
Decision Reliability The ME60-X16 has four SFUs that work in 3+1 load balancing mode. The four SFUs load balance services at the same time. When one SFU is faulty or being replaced, the other three SFUs automatically take over its tasks to ensure normal delivery of services,thus improving system reliability.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Figure 2-16shows the appearance of the Switch Fabric Unit B(SFUI-200-B). Figure 2-16 Appearance of the Switch Fabric Unit B(SFUI-200-B) Panel Figure 2-17 shows the appearance of the panel. Figure 2-17 Appearance of the Panel 1.
HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview NOTE The Switch Fabric Unit B (SFUI-200-B) can be used only on the ME60-X16, and cannot be used together with the BSUA or MSUA. 2.4.3 40Gbps Switch Fabric Unit B Appearance...
2.5.1 Introduction to the Control Plane This section describes the functions of the control plane. The control plane of the ME60-X16 is separated from the data plane and the monitoring plane. The MPU on the ME60-X16 is responsible for system control and management, including route calculation, device management and maintenance, and device monitoring.
HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Data storage: The MPU provides two interfaces for CF cards, which serve as mass storage devices to store data files. System Clock Unit As the system clock unit, the MPU provides accurate and reliable SDH clock signals for LPUs.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Panel Figure 2-21 shows the appearance of the panel. Figure 2-21 Appearance of the panel 1. Ejector lever 2. CLK/Serial 3. CLK/1PPS 4. CLK/TOD 5. AUX 6. Console 7. MGMT-ETH 8.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Indicator/Button Description CF ACT indicator (green) If the indicator is on, the CF is in position. If the indicator is blinking, data is being read or written. If the indicator is off, the CF is not in position or can be removed.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Interface Name Connector Type Description CLK/1PPS It is used to input or output 2-Mbit/s clock signals, 2-MHz clock signals, or 1 PPS signals. CLK/Serial It is used to input or output 2-Mbit/s clock signals, 2-MHz clock signals, or RS232 signals.
2.6 Physical Specifications This section describes the specifications of the chassis and boards. 2.6.1 Chassis Specifications This section describes the physical parameters of the ME60-X16. Table 2-18 lists the physical parameters of the ME60-X16. Table 2-18 Physical parameters of the ME60-X16...
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Short-term operation means that the continuous operation time does not exceed 48 hours and the accumulated operation time per year does not exceed 15 days. Otherwise, it is called long-term operation. Table 2-19 lists the typical configuration of the ME60-X16. Table 2-19 Typical configuration of the ME60-X16 Platform...
HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview 2.6.2 Board Specifications Table 2-20 lists the specifications of boards supported by the ME60-X16. Table 2-20 Specifications of boards supported by the ME60-X16 Type Description ME0D0MPUB470 ME0DSFUI407B ME0DSFUIE07B Versatile Service Process...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Type Description 6-Port 1000Base-X-SFP Flexible Card E Motherboard MSUF-21 Flexible Card Multi Service Unit(MSUF-21,2 sub-slots) FPIC MSUF-21 1-port 10GBase LAN/WAN-XFP FPIC 12-port 100Base-FX/1000Base-X-SFP FPIC 1-port OC-192c/STM-64c POS-XFP FPIC Broadband Service Unit...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 2 ME60-X16 Chassis Overview Type Description Broadband Service Unit 4-Port 10GBase WAN/LAN-XFP Broadband Service Unit Integrated BSUI-41 Integrated(BSUI-41) 40-Port 100/1000Base-X-SFP Broadband Service Unit Integrated(BSUI-41) 2-Port 10GBase WAN/LAN-XFP+20-Port 100/1000Base- X-SFP Broadband Service Unit Integrated(BSUI-41)
3.1 Overview This section gives an overview of the ME60-X8 hardware. 3.2 Power Supply System This chapter describes the power supply system of the ME60-X8. 3.3 Heat Dissipation System This section describes the appearance, functions, and specifications of the heat dissipation system.
The ME60-X8 has an integrated chassis, with main components which all support hot swapping. The ME60-X8 supports all the Line Processing Units (LPUs) on the former ME60, but the Switch and Route Processing Units (SRUs) and Switch and Fabric Units (SFUs) are new.
Figure 3-2 Diagram of the system architecture 3.1.3 System Features This section describes the main features. The ME60-X8 provides the following system features: Unblocked switching network that can be upgraded, with switching capacity at the Tbit/s level Distributed hardware-based forwarding and fast service deployment...
Queries about alarm prompts, alarm indications, running status, and alarm status of the voltage and ambient temperature 3.1.4 Components of the ME60-X8 The ME60-X8 has an integrated chassis, with main components which all support hot swapping. Figure 3-3 shows the architecture and main components of the ME60-X8.
3 ME60-X8 Chassis Overview NOTE Slot number:On the ME60-X8, the slots of LPUs are numbered from 1 to 8. The slot number increases from left to right facing the front panel of the ME60 (there are corresponding marks on the panel).
This section describes partitioned power supply on the ME60-X8. As shown in Figure 3-5, the ME60-X8 backplane is divided into two areas, with each area having two power inputs. These four power inputs work in backup mode. Figure 3-5 Schematic diagram of the power supply for the ME60-X8...
The lightning protection link of the power module has failed. l The power modules does not have input power. If the ME60-X8 has a DC power supply system, four 70 A PEMs work in 2+2 backup mode. Figure 3-7 shows details of the DC power supply system.
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Figure 3-7, each DC power input contains one -48 V power input and one RTN input. Two separated RTN inputs are joined on the board. Figure 3-7 Architecture of the ME60-X8 DC power supply system area 1 area 2 Boards...
Figure 3-9 Rear view of the AC rectifier module Figure 3-8 diagrams the AC power supply system of the ME60-X8. AC power input is converted into regulated DC power by an AC/DC converter. The resulting DC power output is connected to the PEMs through external cables to supply power for all boards and fan modules.
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Figure 3-10, each DC power input contains one -48 V power input and one RTN input. Two separated RTN inputs are joined on the board. Figure 3-10 Architecture of the ME60-X8 AC power supply system area 1 area 2 Boards...
This section describes the ME60-X8's system air channel. The ME60-X8 draws in air from the front and exhausts air from the rear. The air intake vent is located above the board area on the front chassis; the air exhaust vent is located above the board area on the rear chassis.
3 ME60-X8 Chassis Overview 3.3.2 Air Intake Vent An air filter is installed over the air intake vent of the ME60-X8. The air filter has a curved face, large area, and small windage resistance. These features help to improve heat dissipation efficiency.
3.3.4 Air Filter The ME60-X8 draws in air from the front top and exhausts air from the rear top. There is a 3 U space in the upper part of the chassis and an air filter on the front of the chassis. To maximize air intake, the filter is fully perforated.
The switching network responsible for switching data between LPUs is a key component of the ME60. The ME60 uses the switching chips developed by Huawei and Memory-Crossbar- Memory (M-C-M) to provide a three-level switching mode. Level-1 and level-3 switching adopts the shared-memory model and is performed on LPUs;...
Decision Reliability The ME60-X8 has three SFUs. Two SFUs are integrated on two SRUs. Another SFU, is a separate SFU. These three SFUs work in 2+1 load balancing mode.The three SFUs load balance services at the same time. When one SFU is faulty or being replaced, the other two SFUs automatically take over its tasks to ensure normal delivery of services, thus improving system reliability.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Figure 3-15 Appearance of the SFUI-200-C Panel Figure 3-16 shows the appearance of the panel. Figure 3-16 Appearance of the panel 1. Ejector lever 2. ACT indicator 3. OFL button 4.
3 ME60-X8 Chassis Overview NOTE The SFUI-200-C can be used only on the ME60-X8, and cannot be used together with the BSUA or MSUA. The SFUI-200-C can be used only together with the 200G Switch and Route Processing Unit A5.
3.5.1 Introduction to the Control Plane This section describes the functions of the control plane. The control plane of the ME60 is separated from the data plane and the monitoring plane. The SRU is used by the ME60-X8. The SRU integrates an SFU used for data switching.
HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Data configuration: The SRU stores configuration data, startup files, charging information, upgrade software, and system logs. Data storage: The SRU provides two interfaces for CF cards, which serve as mass storage devices to store data files.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview NOTE In this document, the equipment exterior is for reference only. The actual equipment may differ from what is shown in the figures. Panel Figure 3-20 shows the appearance of the panel.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Indicator/ Description Button ACT active/ If the indicator is steady on, the SRU is in the active state. standby indicator If the indicator is off, the SRU is in the standby state.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Interface Name Connector Description Type Console interface RJ45 It connects to the console for on-site configuration of the system. AUX interface RJ45 It connects to the Modem for remote maintenance through dialing.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Attribute Description Operation mode 10M/100M/1000M auto-sensing interfaces, supporting half-duplex and full-duplex modes Standard IEEE 802.3-2002 compliance Cable Category 5 unshielded twisted pair (UTP) cables recommended when the specification interface rate is 10 Mbit/s or 100 Mbit/s; super category 5 Shielded...
G.703 compliance NOTE The Switch and Route Processing Unit A5 can be used only on the ME60-X8. The 200G Switch and Route Processing Unit A5 can be used only together with the SFUI-200-C. 3.5.3 Switch and Route Processing Unit A4...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Figure 3-21 Appearance of the SRU NOTE In this document, the equipment exterior is for reference only. The actual equipment may differ from what is shown in the figures.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Table 3-18 Buttons and indicators on the panel of the SRU Indicator/ Description Button OFL button To remove a board, you must press and hold the button for six seconds until the OFL indicator turns on.
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Table 3-19 Interfaces on the SRU and their uses Interface Name Connector Description Type USB interface It is not used and reserved. CF card interface TYPE II It is used to hold a CF card to store data files as a massive storage device.
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G.703 compliance NOTE The Switch and Route Processing Unit A4 can be used only on the ME60-X8. The 40G Switch and Route Processing Unit A4 can be used only together with the SFUI-40-C. Issue 02 (2012-11-15) Huawei Proprietary and Confidential...
3 ME60-X8 Chassis Overview 3.6 Physical Specifications This chapter describes the specifications of the chassis and boards. 3.6.1 Chassis Specification Table 3-26 lists the physical parameters of the ME60-X8. Table 3-26 Physical parameters of the ME60-X8 Item Description Dimensions (width x depth x 442 mm x 650 mm x 620 mm ( 17.40 in.
2*Fan+4*DC Power+2*SRU+1*SFU+8*LPUF40+16*2-Port10GE FPIC 100G 2*Fan+4*DC Power+2*SRU200A+1*SFU200C+8*LPUF100 +16*5-Port10GE FPIC 3.6.2 Board Specifications Table 3-28 lists the specifications of boards supported by the ME60-X8. Table 3-28 Specifications of boards supported by the ME60-X8 Type Description ME0D0SRUA470 ME0D0SRUA570 Issue 02 (2012-11-15) Huawei Proprietary and Confidential...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Type Description ME0DSFUI407C ME0DSFUIE07C Versatile Service Process Unit C Flexible Card Versatile ME0MVSUF1010 Service Unit 10(VSUF-10) Integrated Versatile Service ME0DVSUI201A Unit 20 A(VSUI-20-A) ME01VSUA0 Motherboard BSUF-10 Flexible Card Broadband Service Unit(BSUF-10,four...
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Type Description Broadband Service Unit 20-Port 1000Base-X-SFP Broadband Service Unit Integrated BSUI-21/ Integrated (BSUI-21) MSUI-21 2-Port 10GBase WAN/LAN-XFP Broadband Service Unit Integrated(BSUI-21) 1-Port 10GBase WAN/LAN-XFP+10-Port 1000Base-X- SFP Broadband Service Unit Integrated(BSUI-21)
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HUAWEI ME60 Multiservice Control Gateway Hardware Description 3 ME60-X8 Chassis Overview Type Description Motherboard MSUF-100 Flexible Card Multi Service Unit(MSUF-100,4 sub-slots) FPIC MSUF-100 1-Port OC-768c/STM-256c POS-2KM-LC Flexible Card 5-Port 10GBase LAN/WAN-SFP+ Flexible Card (BP100,Occupy two sub-slots) Multi Service Unit 10-Port 10GBase LAN/WAN-XFP Multi Service Unit...
4.1 Overview This section gives an overview of the ME60-X3 hardware. 4.2 Power Supply System This chapter describes the power supply system of the ME60-X3. 4.3 Heat Dissipation System This section describes the appearance, functions, and specifications of the heat dissipation system.
The ME60-X3 adopts a centralized routing engine and a distributed forwarding architecture. The ME60-X3 has an integrated chassis, with boards support hot swapping. The ME60-X3 has two types of chassis, namely, the DC chassis and the AC chassis. Figure shows the DC chassis and Figure 4-2 shows the AC chassis.
Queries about alarm prompts, alarm indications, running status, and alarm status of the voltage and ambient temperature 4.1.3 Components of the ME60-X3 The ME60-X3 has an integrated chassis with main components which all support hot swapping. Figure 4-3 shows the components of the ME60-X3 DC chassis.
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4. Rack-mounting ear 5. Air intake vent 6. Handle 7. Power module 8. Air filter 9. Ground terminal 10. Fan Figure 4-4 Components of the ME60-X3 AC chassis CONS OLE CF CARD RESE T LINK OFL CFS CONS OLE CF CARD...
An interface is numbered in the format of slot number/card number/port number NOTE Slot number: On the ME60-X3, the slots of LPUs are numbered from 1 to 3. The slot number increases from bottom to top, facing the front panel of the ME60 (there are corresponding marks on the panel).
The slots are for LPUs (optional). Number of MPU slots 4.2 Power Supply System This chapter describes the power supply system of the ME60-X3. 4.2.1 Architecture of the Power Supply System This section describes the features of the power supply system.
One of the power modules does not have input power. The following is the introduction to the PEM. The PEM of the ME60-X3 has one straight-through power input that provides the following functions: Issue 02 (2012-11-15) Huawei Proprietary and Confidential...
4.2.4 AC Power Supply System(EPW30B-48A) This section describes the appearance, functions, and the technical parameters of the AC power supply module. The AC power module of the ME60-X3 as shown in Figure 4-8. Figure 4-8 Appearance of the AC power module Table 4-5 describes the indicators on the AC power module.
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Fans on power modules 4.3.2 Air Intake Vent An air filter is installed over the air intake vent of the ME60-X3. The air filter has a curved face, large area, and small windage resistance. These features help to improve heat dissipation efficiency.