1. Comparison of Core Technical Parameters

　　Telecom-grade 300W DC-DC power supplies focus on compatibility with -48V primary power systems, extreme environment resilience, and network-grade reliability, with parameters aligned to ITU-T standards (information integrated from telecom power technical specs and vendor whitepapers):

　　Artesyn BDQ300-48S12 (Macro Base Station): Accepts 40-60V DC input (matching telecom -48V power distribution), delivering 12V/25A output. Features 1500Vrms reinforced isolation , 95% peak efficiency, and -40~+85℃ wide-temperature operation . Equipped with droop current sharing (supports 4-unit parallel N+1 redundancy), ripple/noise ≤30mVp-p, and protection for overvoltage (13.2V), overcurrent (27.5A), and overtemperature (105℃ shutdown). Adopts substrate cooling with aluminum alloy housing, MTBF ≥1,200,000 hours, and dimensions 58×122×12.7mm (1/4 brick form factor).

　　CUI PSE-300-54 (PoE & Micro Base Station): Input range 40-60V DC, output adjustable 42-55V/6.25A (optimized for PoE++ applications) . Achieves 94% efficiency at 50% load (Platinum level), with 2kVAC input-output isolation. Supports hot-swap blind-mating via integrated connector, PMBus/I2C digital monitoring , and fanless convection cooling. Protection includes 6kV surge (complies with ITU-T K.20) , short-circuit (auto-recovery), and reverse polarity. Operating temperature: -30~+75℃, size 40×101×35mm (1U rack-mountable).

　　Mean Well RD-300B-24 (Core Network): 18-36V DC input (for backup battery systems), 24V/12.5A output. 1000VAC isolation, 92% efficiency, and -20~+70℃ operation. Integrates active current sharing (N+1 redundancy), ripple/noise ≤50mVp-p, and temperature-controlled fan (35dB). Protection covers overvoltage (26.4V), overload (120% rated current), and AC surge (8kV). MTBF certified 800,000 hours, dimensions 152×85×38mm.

　　2. Key Selection Criteria for Telecommunication Adaptation

　　2.1 Primary Power System Matching

　　-48V Main Supply: Input range 40-60V DC mandatory (accommodates battery discharge fluctuation), e.g., Artesyn BDQ300 for base stations .

　　Backup Battery Compatibility: 18-36V input models (Mean Well RD-300B) for 24V lead-acid battery banks, required for core network equipment.

　　Output Flexibility: 42-55V adjustable output (CUI PSE-300) preferred for PoE++ powered devices (IP cameras, small cells) .

　　2.2 Reliability & Redundancy Mandates

　　Redundancy: N+1 parallel operation with current sharing accuracy ≤5% (critical for core routers), supported by both droop (CUI) and active (Artesyn) schemes .

　　MTBF Requirement: ≥800,000 hours for base stations; ≥1,000,000 hours for data center telecom gear.

　　Component Grade: Industrial-grade capacitors (10,000h @105℃) and military-spec MOSFETs to withstand voltage transients.

　　2.3 Environmental Resilience

　　Temperature: -40~+85℃ for outdoor macro stations (Artesyn BDQ300); -30~+75℃ for indoor micro cells (CUI PSE-300) .

　　Surge Protection: ≥6kV line-to-ground surge (ITU-T K.20) , achieved via gas discharge tubes (GDT) + TVS diode combination.

　　EMC Compliance: Must pass EN 300 386 (telecom EMC) and IEC 61000-4-5 (8kV surge immunity).

　　2.4 Telecom-Specific Certifications

　　Global compliance required:

　　ITU-T K.44 (overvoltage resistance)

　　Telcordia GR-1383 (network equipment reliability)

　　YD/T 1058 (China telecom equipment standard)

　　UL 60950-1 (safety for North America)

　　3. Mainstream Products and Application Scenarios

　　Artesyn BDQ300-48S12: Key advantages include 1500Vrms isolation, -40℃ cold start, and substrate cooling. Ideal for outdoor macro base stations (powering RF modules, transceivers), reference price \(380-\)450, 5-year warranty.

　　CUI PSE-300-54: Highlights PoE++ compatibility (42-55V adjustable), hot-swap design, and 6kV surge protection . Suitable for indoor micro base stations, IP PBX systems, and PoE switches. Price \(320-\)380, supports 1U rack mounting for 4-unit parallel operation .

　　Mean Well RD-300B-24: Strengths in battery backup  (18-36V input) and active redundancy. Used for core network routers, optical transmission equipment, and telecom cabinets. Price \(280-\)330, MTBF 800,000 hours.

　　4. Key Design and Application Considerations

　　4.1 Surge Protection & EMC Design

　　Comply with ITU-T K.20: Install 6kV gas discharge tubes (GDT) at input and SMBJ6.5CA TVS diodes at output to suppress lightning-induced surges.

　　Input filtering: Use 470μF low-ESR capacitors (Rubycon ZLH series) to meet IEC 61000-3-2 Class A harmonic requirements.

　　4.2 Thermal Management for Outdoor Deployment

　　Fanless models (CUI PSE-300): Adopt aluminum heat sinks with thermal conductivity ≥200W/(m·K), ensure 15mm airflow gap between modules.

　　High-temperature regions: Select substrate-cooled versions (Artesyn BDQ300) and apply 0.1mm silicone thermal pads (thermal resistance ≤0.5℃/W).

　　4.3 Redundancy & Battery Backup Integration

　　N+1 configuration: Parallel 3×300W units for 600W load, use TI UCC28070 controllers for current sharing (deviation ≤3%).

　　Battery switching: Integrate OR-ing diodes (Vishay VS-30BQ045) for <5ms backup transfer (complies with YD/T 1058-2015).

　　4.4 Remote Monitoring & Maintenance

　　Implement PMBus/I2C communication to monitor voltage, current, and temperature; trigger SNMP alerts for >95℃ or output deviation >5%.

　　Fan-cooled models (Mean Well RD-300B): Design tool-less dust filters, schedule quarterly cleaning to avoid overheating.

　　Annual insulation test: Apply 1500V DC for 1 minute (primary-secondary resistance ≥100MΩ) .

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