Identify the measurement
Round-trip time is the elapsed time for a communication to travel out and back under a test’s conditions. Throughput measures data transferred over time. The IETF’s TCP testing framework treats these separately and relates them through a bandwidth-delay product. A result expressed in milliseconds should therefore not be compared numerically with a result expressed in megabits per second as though they were the same score.
Keep the destination relevant
A test to a nearby measurement server can take a different route from the media application’s requests. Record which test was used, when it ran and on which device. A good result is useful evidence about that test, rather than proof that every remote source is equally reachable. Comparing a phone beside the router with a television across the house changes the local path as well as the receiving device.
Understand the bandwidth-delay relationship
For a hypothetical 20 Mbit/s path with a 50 ms round trip, multiplying rate by time gives 1 Mbit of data in flight, or 125,000 bytes. This is arithmetic illustrating the bandwidth-delay product, not a measurement of a service. It shows why capacity and delay can interact in transport behaviour while remaining distinct quantities. It is not an instruction to edit application buffers to that number.
Report variability alongside the headline
One favourable result can miss a problem that occurs intermittently. Note whether the observation was made during the actual playback issue and whether other household activity changed. Keep test duration and conditions comparable without generating unnecessary traffic. A concise record of the affected application and time, plus relevant measurements, helps more than declaring the connection perfect because one ping or download test produced an attractive figure.
Questions, answered
Does a low ping prove there is enough streaming bandwidth?
No. Delay and throughput are different measurements. Their destination, timing and variability also matter when relating a test to actual playback.