SLM/DOCSIS tester - CX110+

A next generation CATV installer meter to characterize and measure Analog and Digital video signals. For Analog carriers, Peak Video level, single or dual channel Audio levels and Carrier to Noise (C/N) measurements are possible on NTSC, PAL, or SECAM video formats. Digital QAM16/64/256 carriers with or without deep Interleaving are measured accurately with MER, BER and Constellation diagram results being reported. Tilt, Quick Test, and Forward/Reverse ingress scan are standard features. The built-in Ethernet port supports Triple Play test features, such as VoIP call emulation with MOS scoring, Web-browser, IP connection testing, remote control, test results upload/download, and system management. WiFi connectivity tests can be performed using a USB WiFi adaptor.

The CX110+ is equipped with a built-in DOCSIS cable modem, which discovers the upstream frequencies by listening on the downstream channel for Upstream Channel Descriptor (UCD) packets. Once a special message called a map is detected, the cable modem begins to transmit upstream data starting at its lowest power level, incrementing in 3dB steps until the CMTS acknowledges the request.

Once detected, the CMTS analyzes the power, frequency and timing of the range request and send the cable modem a response which provides instructions for the modem to adjust its transmit power, frequency and timing to operate properly on the network. The upranging check functionality is very useful for technicians who are only concerned with the RF alignment and synch process when installing cable modems.