Copper core power cable laying cable sets what fixed
A fiber into the machine room, advanced ODF fiber wiring box, and then through the pigtail to SDH photoelectric conversion into electrical signals, and then through the 2M line in the DDF frame (DDF frame is a transfer), and then to the BTS
BTS is 2G base station, a wireless network consists of N BTS and several BSC, each BTS need to access the BSC through the transmission network. 2G base station transmission interface is mostly 2M interface. SDH (Synchronous Digital System), is a technical system developed by ITU, is a transmission technology. SDH line side (that is, out of the cable) is 155M, 622M, 2.5G, 10G optical interface. Branch side (then business network equipment, including base stations) are more than 2M, FE, GE also has 155M optical interface. DDF and ODF are patch panels, DDF digital patch panels, ODF fiber patch panels. SDH line side of the ODF frame, is received on the outgoing cable, DDF frame service network equipment, in the base station is then BTS. Set the patch panel is mainly for easy maintenance, you can label on the patch panel, each interface business type is very clear. The communication system diagram in the base station is this: BTS - DDF - SDH - ODF - another bureau.
SDH is a synchronous time division multiplexing device, the electrical interface of the 2M signal into the optical interface of the high-speed signal (the use of digital fiber optic patch panel SDHsynchronousdigitalhierarchy) 155M, 622M, 2.G, 10G, etc.). 2 trillion of the signal can be in the DDF above jumper, easy to connect. The optical path signal is spanned on the ODF and is interconnected with the optical interface of the cable or other device. Usually with the network, telephone, etc. are specific business, their communication distance is limited, are generally carried through the transmission network to expand the communication capacity, extending the communication distance. SDH is the main equipment of the current transmission network. DDF and ODF are mainly used in the machine room. The physical interface between devices is BTS-DDF-SDH-DDF-BSC-ODF-MSC or BTS-DDF-SDH-ODF-BSC -ODF-MSC Of course, bsc and msc may also have a section of ODF-SDH-ODF, see the specific circumstances
