Data Over Cable Service Interface Specification (DOCSIS) measurement mode analyzes the digital performance of user-selected DOCSIS channels to verify downstream/upstream connectivity. Only DOCSIS channels defined in the downstream (forward path) channel plan are available for DOCSIS measurement testing. To perform and display DOCSIS measurement mode data the following tests are provided:

NOTE:
The DOCSIS configuration selection box located within the CONFIGURE > MEASURE > OTHER SETTINGS screen must have "Registration with CPE initialization" selected to perform and display DOCSIS measurement mode data.

Ranging test

Performs ranging and displays measurement performance data on the upstream and downstream signal level, downstream modulation error ratio (MER) (or EVM, as configured), and the estimated downstream bit error rate (BER) before and after forward error correction (FEC). The range measurement data can be viewed in relation to user-configured limits to determine the Pass/Fail status of the DOCSIS channel. (See the Help section entitled "Interpreting Ranging Results".)

Registration test

Performs registration and displays internet protocol (IP) addresses of the dynamic host configuration protocol (DHCP), trivial file transfer protocol (TFTP) and time of day (TOD) servers and gateway. The registration test also provides the modems internet protocol (IP) address, configuration file, and Service IDentifier (SID). (See the Help section entitled "Interpreting Registration Results".)

Throughput test

Displays throughput (upstream and downstream) test results. (See the Help section entitled "Interpreting Throughput Results".)

Packet Loss test

Displays packet loss (round trip, upstream, and downstream), and upstream signal to noise ratio (SNR) test results. (See the Help section entitled "Interpreting Packet Loss Results".)

Ping test

Ping test verifies the overall downstream/upstream communication route and connectivity of a DSAM within the cable system. The ping test allows you to select the IP address, packet size, and time between pings and displays ping test result data that includes; round trip time, time-to-live (TTL), packets sent and lost, average round trip time, and loss to sent ratio. (See the Help section entitled "Interpreting Pinging Results".)

VoIPCheck test

Displays VoIP call statistics without MTA provisioning. The VoIPCheck test is a continuous test. During a VoIPCheck test, packetloss, jitter, delay, R-Value and MOS values are displayed.

NOTE:
When necessary, the user can troubleshoot an installation by performing these tests at various locations to determine which components require repair or replacement. Test results can be stored for later reference.