The customer wants to set up several 155M electrical interface links between the equipment rooms on the top and the first floors. The distance of 155M electrical interface transmission is limited by attenuation. How long is the 155M cable supported by the NG-SDH SEP at most?
The 155M electrical interface supports a maximum of 12.7 dB attenuation per 77 m with the transmission distance varying according to the model of the coaxial cable.
The currently delivered NG-SDH supports a maximum transmission distance of 70 m through the common coaxial cable. If the thick coaxial cable with the core diameter as 6.7 mm is used, the supported distance is up to 130 m. The BOM number of the thick coaxial cable with the core diameter as 6.7 mm available to the SEP is 04040361, and the product description is trunk cable-130.00 m-75 ohm-6.7 mm-(SMB75 straight female-Ⅶ)-(SYV75-3.8/0.61(S)).