A Digital Distribution Frame (DDF) is the interface when coaxial cable has to be terminated, organized or cross-connected in long-distant transport networks, or in access networks close to subscribers. LongXing is expert in producing DDF products and currently providing products to China's main telecom networks in 28 provinces. The frame is equipped with perfect earth system, and 75Ω/ 120Ω convertor can be provided at user's requirement. 75Ω Digital Distribution Frames are used to terminate, cross-connect and inter-connect. 75Ω coaxial cables, and to supervise digital transmission equipment.
l This frame is made of quality materials such as aluminum alloy, steel plate etc.
l The surface is treated by way of galvanization, oxidization, plastics coating etc.
l The structure is stable with pleasing appearance.
l Both closed type and open type can be selected. Open type frame is convenient for frame
combination and capacity expansion.
l The wires are laid at two sides so as to enlarge capacity and save effective space of machinery
l Unit structure is flexible and convenient for deployment and installation:
l The unit plate is divided into two rows of ports (10 systems) or four rows of ports (21 systems)
for user's selection.
l Rotary or fixed type structure can be adopted for each unit plate. Rotary unit plate can be turned
down freely for convenient cable connection and maintenance.
l The unit plate can be assembled vertically or horizontally at user's discretion.
l The frame is equipped with perfect earth system.
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|Operation Speed||2Mbit/s, 8Mbit/s, 34Mbit/s, 45Mbit/s, 140Mbit/s, 155Mbit/s|
|Contact resistance||Outer conductor≤2.5MΩ, the increment≤2.5MΩ after mechanical durability test
Inner conductor≤10MΩ, the increment≤10MΩ after mechanical durability test
|Insulation resistance||≥1000MΩ, the voltage of test circuit is 500Vdc|
|Cross-talk prevention level between the circuit||≥70dB (50 kHz-233MHz)|
|Interruption loss||≤0.3dB (50 kHz-233MHz)|
|Return loss||≥18dB (50 kHz-3.1MHz)|
|Pull-off force||Connected with cable, the coaxial connector can resist pulling force of more than 50N|
|Mechanical durability||After 1000 times of inserting and pulling-out of coaxial connector, the contact resistance, interruption loss and return loss still meet requirements,
and there is still electro deposition on the contacting surface without base material exposed.
(H * W * D)
|2600*480*300||10 systems/unit 200 system(20 units)/frame One-side frame||User can choose either rotary or fixed unit.|
|2200(2000)*480*300||10 systems/unit 160 system(16 units)/frame One-side frame|
|2600*480*300||10 systems/unit 208 system(13 units)/frame One-side frame|
|2200(2000)*480*300||10 systems/unit 160 system(10 units)/frame One-side frame|
|2600*600*300||10 systems/unit 200 system(20 units)/frame One-side frame|
|2200(2000)*600*300||10 systems/unit 192 system(16 units)/frame One-side frame|
|2600*480*450||10 systems/unit 400 system(40 units)/frame Double-side frame|
|2200(2000)*480*450||10 system/unit 320system(32units)/frame Double-side frame|
|2600*600*450||10 system/unit 480system(40units)/frame Double-side frame|
|2200(2000)*600*450||10 system/unit 384system(32units)/frame Double-side frame|