Wrong rssi2dBm conversion

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The formula used by chan-dongle for converting RSSI value to dBm is:

0: <=-12dBm
1-30: = (31 * rssi / 50 - 125) [dBm]
31: >= -75dBm

But, according to Huawei specs (see page 21 of the attached document) it should 
be:

0 Equal to or less than -113 dBm
1 -111 dBm
2...30 -109... -53 dBm
31 Equal to or higher than -51 dBm
99 Unknown or unmeasurable.

So, the formula should be:
dBm = (rssi*2)-113

Original issue reported on code.google.com by lucibunea@gmail.com on 28 Mar 2013 at 5:00

Attachments:

• [HUAWEI UMTS Datacard Modem AT Command Interface Specification_V2.3.pdf](https://storage.googleapis.com/google-code-attachments/asterisk-chan-dongle/issue-118/comment-0/HUAWEI UMTS Datacard Modem AT Command Interface Specification_V2.3.pdf)

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i readed other spec

Original comment by bg_...@mail.ru on 27 Apr 2013 at 3:11

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Original comment by bg_...@mail.ru on 27 Apr 2013 at 3:26

• Changed state: Accepted

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fixed in r32, may be wrong

Original comment by bg_...@mail.ru on 30 Jul 2013 at 8:16

• Changed state: Fixed