Re: [PATCH] doc: Add modem Type property

[Lei Yu <lei.2.yu@nokia.com>]

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Hi Denis,

On 01/21/2011 01:04 PM, ext Denis Kenzior wrote:
> Hi Lei,
>
>>>> +        string Type [readonly, optional, experimental]
>>>> +
>>>> +            String representing the type of the modem device.
>>>> +
>>>> +            The possible values are:
>>>> +                "gsm"     Modem supports one or more of the 3GPP
>>>> +                    family of technologies including GSM,
>>>> +                    EDGE, UMTS, HSPA, LTE.
>>>> +                "cdma"  Modem supports one or more of the 3GPP2
>>>> +                    family of technologies including CDMA 1x,
>>>> +                    EVDO.
>>>> +                "hfp"    Bluetooth hands-free profile (HFP) modem
>>>> +
>>>
>>> So one pointed question:
>>>
>>> How are we planning to support dual-mode devices with this property?  I
>>> believe during the CDMA workshop we decided that the clients should
>>> simply look at the set of interfaces, not a semi-static property...
>>
>> We understand that the decision during the CDMA workshop but as we
>> explained one use case in the cover letter
>> (http://lists.ofono.org/pipermail/ofono/2011-January/007890.html) for
>> this RFC, there will be cases where atom's D-Bus I/F is not suitable (or
>> as a reliable way) for telling what is current mode (CDMA or GSM). E.g.,
>> in the case of retrieving serial number from modem. Currently both CDMA
>> and GSM shares the same I/F (ofono.org.modem) rather than having
>> separate (ofono.org.cdma.modem). And, further if no other atom has been
>> instantiated, then, there will be no other way to tell which mode (CDMA
>> or GSM) the modem is. And, further for displaying serial number, upper
>> layer will need to know it is CDMA or GSM. In case of CDMA, the serial
>> number is MEID and GSM it is IMEI. As explained in cover letter, we
>> anticipate more cases like this.
>
> So let us say I have a dual-mode modem.  Are there now two serial
> numbers? One for MEID and one for IMEI?  Are there now two
> Manufacturers? Two Revisions?

Try to clarify what you try to ask first. Let's start with the dual-mode 
case where the modem is integrated modem (one piece of HW) where it 
supports both CDMA and GSM. Then, there is case where the phone actually 
has both MEID and IMEI. And, these two numbers are actually the same 
(note, per IMEI's assignment there is a pre-arranged segment for this 
kind of world phone). And, in which case, one manufacture, one revision. 
Per the other thread, in which case the "Type" will be something like 
"gsm_cdma".
Of course, there can be case where two physical modems are in the device 
in which case there will be two separate serial numbers and two 
manufacturers and revisions. I am assuming you are not asking for this case.

Again, the problem we try to solve is single mode case.

>
> Regards,
> -Denis

Regards,
- Lei