Dimensions of DC power supply units for metropolitan area networks

DC power supply units for metropolitan area networks typically use compact, standardized form factors such as board-mount, brick-type, and modular units, with heights ranging from 1U (1.75 inches) to 2U (3.5 inches) in rack-mounted systems.

Common Form Factors and Dimensions

1. Board-Mount Converters:

• Example: Advanced Energy's Artesyn AIF13WAC 600 W board-mount power converter.
• Designed for contact-cooled telecom and industrial applications.
• Compact footprint suitable for integration into telecom chassis or network equipment.
• Can be paralleled for higher power, providing scalability without increasing individual unit size . 2. Brick-Type Modules:
• Standardized rectangular modules, often used in telecom racks.
• Typical dimensions: 2.3–3.0 inches wide, 4–6 inches long, and 1–2 inches high, depending on power rating.
• High power density allows efficient use of rack space while maintaining cooling efficiency . 3. Rack-Mount Units (1U and 2U):
• 1U PSU: 1.75 inches (44.45 mm) height, fits in a standard 19-inch rack.
• 2U PSU: 3.5 inches (88.9 mm) height, also compatible with 19-inch racks.
• Width: 19 inches (standard rack width), depth varies by manufacturer and power rating.
• Power ranges: 1U units typically 250–800 W, 2U units 600–1200 W or higher.
• Hot-swappable designs are common to minimize downtime in high-density network environments .

Design Considerations

• Efficiency: 80 Plus ratings (Bronze to Titanium) are used to reduce heat and improve energy performance. High efficiency is critical in MANs to minimize cooling requirements and maintain reliability .
• Modularity: Modular PSUs allow incremental capacity expansion, reducing initial costs and enabling flexible deployment in growing networks .
• Cooling: Contact-cooled or forced-air designs are common. Proper airflow management is essential to prevent thermal issues in dense rack installations .
• Redundancy: Many MAN PSUs support parallel operation for redundancy, ensuring continuous operation during maintenance or failure of individual units .

Summary

DC power supply units for metropolitan area networks are designed to be compact, modular, and efficient, with standard rack-mount heights of 1U or 2U, or as brick-type and board-mount modules for embedded applications. Their dimensions and modularity allow network operators to scale power delivery while maintaining high reliability, efficient cooling, and ease of maintenance .