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.