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.