The values of 'slow-2g
', '2g
', '3g
', and '4g
' are determined using observed round-trip times and downlink values.
| ECT | Minimum RTT | Maximum downlink | Explanation |
|---|---|---|---|
slow-2g
|
2000ms | 50 Kbps | The network is suited for small transfers only such as text-only pages. |
2g
|
1400ms | 70 Kbps | The network is suited for transfers of small images. |
3g
|
270ms | 700 Kbps | The network is suited for transfers of large assets such as high resolution images, audio, and SD video. |
4g
|
0ms | ∞ | The network is suited for HD video, real-time video, etc. |
effectiveType is a property of the Network Information API , exposed to JavaScript via the navigator.connection object. To see your effective connection type, open the console of the developer tools of a supporting browser and enter the following:
js
navigator.
connection.
effectiveType;