Contact Network Simulator | mysimulator.uk

Contact Network

Contacts 10

Send rate 2.5 msg/s

Signal speed 4.0 u/s

Packet loss 8%

In flight

–

Delivered

–

Dropped

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Avg latency

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How it works

A central hub node ("you") maintains a live link to every contact node arranged around it. At random intervals the hub fires a message packet toward a randomly chosen contact; the packet travels along the straight line between the two nodes at a fixed signal speed, so farther contacts naturally take longer to reach. A packet can be lost in transit with a fixed probability, mimicking a dropped connection or a bounced message — lost packets flash red and vanish before arriving.

t_arrive = t_sent + |P_hub − P_contact| / speed
P(delivered) = 1 − lossRate
latency = t_arrive − t_sent

Contacts — how many nodes the hub keeps in its network; more contacts spread messages across more simultaneous links.
Send rate — how often the hub fires a new message; higher rates keep more packets in flight at once.
Signal speed — how fast a packet crosses space; slower signals raise average latency without changing loss.
Packet loss — the chance any single message never arrives, visualised as a red flash partway along its path.
Signal trails — toggle the fading line each packet leaves behind to see its exact path.

Real-world relevance: this is the same store-and-relay picture behind any messaging or telecom system — a client-server link, an email relay, or a cellular base station — where propagation delay and packet loss both grow with distance and network load.

Hub (you) Contact Delivered Dropped

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