Product Description 
The choice of modulation mode should consider the transmission quality of the channel. In addition, you must also set the IP address of the DHCP, TFTP server, and the IP address of CMTS, and the like. After the above setting is completed, if the intermediate line is not faulty, the attenuation of the signal level meets the requirements, and the DHCP, the TFTP server can establish normal communication channels between the front and Cable MODEMs. Through the configuration of the Console interface, similar to the Cable MODEM configuration, in the way of the line command, the configuration provided by the manufacturer is required by the configuration of the Ethernet interface.
Generally, the downstream output level of the CMTS is 110 to 121 dBμV, and the received input level is 44 to 86 dB [μV; the level of the Cable Modem receives from 45 to 75 dBμV; the level of the uplink signal is 68 ~ 118dBμV (QPSK) or 68 ~ 115dBμV (16QAM). After the upper and downlink signals are transmitted after the HFC network transmission process, the level of the arrival device should meet these requirements.
The uplink channel interface and the downlink channel interface in the CMTS device are separated, and the high low pass filter is used to mix into the HFC network through the mixer with the cable TV signal. In actual use, it is also possible to use the branch dispenser to complete the mixing of the signal, but because the isolation of these devices is poor, there is a certain interference between the upper and downstream channels inside the CMTS device.
After the CMTS and Cable Modem is established, network management can be used to use Simple Network Management Protocol (SNMP). The CMTS device that meets the DOCSIS standard must meet the standard MIB definition.