Siemens standard digital distribution frame (DDF)

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DDF Digital Distribution Frame

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Product Description
Product parameters
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Siemens standard DDF unit

Feature description:
   1. Siemens SM-75Ω ohm series with different impedance, various cabinet structures, and multiple combinations for customers to choose from;
   2. Performance: Strict structural design, high-quality metal and non-metal materials, standard gold plating, and exquisite, rigorous craftsmanship ensure the product's performance is stable and reliable;
   3. Structure: A complete and scientific cable structure, whether for middle wiring, side wiring, front and back jumpers, or inter-frame jumpers, all conform more to your usage habits, making operation more convenient. The complete grounding system, diverse fixing methods, and the 90-degree rotating unit are all perfectly designed to ensure greater convenience for customers.
Technical specifications:
　　1. Environmental requirements:
　　1. Operating temperature: -5℃ to +40℃
　　2. Storage temperature: -25℃ to 55℃
　　3. Operating relative humidity: ≤85% (+30℃)
　　4. Storage relative humidity: ≤75%
　　5. Atmospheric pressure: 70KPa to 106KPa
　　2. Equipment rack:
　　1. Rack height: 2000mm, 2200mm, 2600mm
　　2. Rack material: aluminum profile, cold-rolled plate
　　3. Cable entry method: top entry, bottom entry
　　4. Operation method: full front operation
　　5. Rack color: optional
　　6. Grounding method: copper strip
　　3. Coaxial connector:
　　1. Characteristic impedance: 75Ω
　　2. Operating rate: 2Mb/s, 8 Mb/s, 34 Mb/s, 140 Mb/s, 155 Mb/s (except for some standards)
　　3. Insulation resistance: >1000MΩ (500VDC)
　　4. Electric strength: ≥1000V (50Hz AC)/min, no breakdown, no arcing
　　5. Contact resistance: outer conductor ≤2.5mΩ (crimped), inner conductor ≤10mΩ
　　6. Insertion loss: ≤0.3dB (50KHz to 233MHz)
　　7. Return loss: ≥18dB (50KHz to 233MHz)
　　8. Crosstalk immunity: ≥70dB (50KHz to 233MHz)
　　9. Pull-out force: >50N
　　10. Connector lifespan: ≥1000 times
　　11. Materials: brass, beryllium copper
　　12. Gold plating thickness of coaxial connector: ≥2um

Serial Number	Product Name	Specification Model	Dimensions (HeightWidthDepth)	Material	Remarks Note
1	SM-8Unit Body	8System/16Circuit	10048590	Pure Copper	19″ Inch Cabinet
2	SM-10Unit Body	10System/20Circuit	10048590	Pure Copper	19″ Inch Cabinet
3	SM-16Unit Body	16System/32Circuit	14048590	Pure Copper	19″ Inch Cabinet
4	SM-20Unit Body	20System/40Circuit	14048590	Pure Copper	19″ Inch Cabinet
5	SM-21Unit Body	21System/42Circuit	14055090	Pure Copper	19″ Inch Cabinet