Displays packet loss (round trip, upstream, and downstream), and upstream
signal to noise ratio (SNR) test results.
Measurement Data
The PACKET LOSS Test contains all of the DOCSIS Packet Loss measurement
data. This measurement data is captured and continuously updated during
the DOCSIS Packet Loss test process. To perform the Packet Loss test,
press the VIEW softkey, use the arrow keys to select Packet
Loss, and press ENTER.
Packets Loss
The packets loss test always uses two paths (upstream and downstream) for
testing.
If the read community string is provided the DSAM displays separate counts
for the upstream and downstream paths as follows:
- Round trip or loop sent packets, lost packets and lost ratio
- Upstream sent packets, lost packets and lost ratio
- Downstream sent packets, lost packets and lost ratio
NOTE: DSAMs can receive up to four SNMP read community strings through
synchronization with JDSU Test Productivity Pack (TPP) software. For security
purposes, these strings are not editable or viewable on the meter. If
your upstream and downstream packet loss and upstream SNR test results
are consistently displayed as dashes (---), consult your JDSU Test Productivity
Pack (TPP) administrator about the accuracy of the SNMP strings you have
received. Your meter requires accurate SNMP read community strings to
gain read-only access to the Management Information Base (MIB) of the
Cable Modem Termination System (CMTS) and to perform these DOCSIS measurements.
Upstream Modulation
The upstream modulation portion of the screen displays the upstream SNR.