问题
I want to know about GSM modems. I need low level info.
Can the modem get me Layer 3 Messages, Rx and Tx level, Rx Qual., C/I, BCCH, BISC, ARFCN and ...
Edit
Note: I'm not asking about embedded modems only, I'm asking on both embedded and external modems.
Thanks and Best Regards
回答1:
Your best bet for low level information is AT commands. See the answer to this SO question for specific commands for the information that you want.
Although it's about Android, you can assess AT commands on any operating system, as long as the modem device exposes a modem port (It may sound obvious that any modem would expose a modem port, but this is not the case. Some modems appear in Windows as network adapters, for example).
But note that Layer 3 messages aren't available over the AT interface. You would need a diagnostic tool from the chipset manufacturer to read the air interface messages. These are not usually available unless you're a partner company or customer of the manufacturer.
Edit:
Embedded and external modems are treated the same. The best interface to use depends on the driver. AT commands work with the vast majority of modems. Read the AT command manual for information that you can get via AT commands.
Try to get hold of a manual of manufacturer specific commands that are particular to your chosen modem.
Use AT+CLAC to get all the supported AT commands of your particular modem.
L3 messages arrive via the air interface. As I said before, the chipset manufacturers have their own interfaces to access this information, but these are not public.
来源：https://stackoverflow.com/questions/26694918/what-are-the-information-that-can-gsm-modem-get