Digital Distribution Frame (DDF) is used for distribution and communication of digital terminal equipments or programmable exchangers whose transmission rate is within 2~155Mb/s. With the function of dispatching, transferring and testing for the circuits, it is convenient to use and maintain, flexible to meet the needs of changes. It is one of the necessary facilities for digital transmission system and programmable exchange. The following specifications can be available: Model Dimensions (mm) Capacity (Sys) Note H W D 75Ω/75Ω MPX241B-26 2600 480 450 256 8/16-System Digital Individual Shelf, Double-sided 22 2200 480 450 208 20 2000 480 450 192 Model Dimensions (mm) Capacity (Sys) Note H W D 75Ω/75Ω MPX241E-26 2600 520 450 360 20-System Digital Individual Shelf, Double-sided 2200 520 450 320 2000 520 450 280