Member Avatar for silvercats

I need to know if this modem only suppports 3.6 or 7.2mb/ps. Because my current connection doesn't support 7.2 ,how to measure physical speed of the modem?

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Dani AI

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Short answer: the Windows balloon or connection manager only shows a negotiated/network class, not the sustained throughput you will actually get. As discovered without documentation, you need to identify the exact dongle variant and then either look up the vendor specs or query the modem itself. As pointed out, tower, signal and plan all limit real speed.

How to verify what the modem hardware supports (step‑by‑step)

  • Check the physical label or packaging for the exact model/revision.
  • In Windows Device Manager open the modem/ports entry, Properties -> Details -> Hardware Ids; use that string to identify the exact model online.
  • Open a serial/terminal session to the modem COM port (PuTTY/Tera Term) and query basic info. Try:
    ATI
AT+CGMM
AT+CSQ

    ATI / AT+CGMM return device/manufacturer info you can look up; AT+CSQ shows signal quality. Once you have the model/firmware, search the manufacturer spec sheet for the HSDPA/HSPA category (that defines theoretical maxs).

How to measure real throughput

  • Run controlled tests (speedtest.net or an iperf run to a nearby server) with no other traffic and repeat at different times.
  • Note the SIM’s data plan, network congestion, signal level, and USB port type (USB 1.1 vs 2.0) — all affect observed speed.
  • Theoretical HSDPA figures are peak link rates; real TCP throughput will be lower because of protocol overhead and radio conditions.

If identification still fails, ask the eBay seller for the exact model code or check archived product pages/support docs from the vendor.

Recommended Answers

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Member Avatar for rubberman

I assume this is a broadband LTE modem? You need to make sure you have a very good connection to the appropriate tower. If you don't, then you will get some fraction of the maximum speed the device is capable of. What does the manufacturer documentation say?

Member Avatar for silvercats

Never mind I figured it out.thanks!I ordered it from Ebay so there is not documentation

Member Avatar for rubberman

So, what did you find out? :-)

Member Avatar for silvercats

What I actually meant was Modem's speed.not connection's maximum speed.
I connected it to a windows XP(I use 7 on my pc )pc .Then clicked connect and then pop up baloon came from the task bar and showed that it is 7.2 mb/ps.

Edited by silvercats because: n/a
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