Bluetooth or Cable? for gprs what is better on siemens s55

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

vipul shah - 18 Oct 2003 11:00 GMT

Hi,
I am using GPRS using Siemens S55 on my PC which has bluetooth
adapter.

I am getting maximum 7-8 hour battery life when on GPRS using
bluetooth.

What is more energy/battery efficient? Serial cable (which comes free
with Siemens S55) or Bluetooth?

Vipul Shah

Reply to this Message

John Henderson - 18 Oct 2003 12:24 GMT

> I am using GPRS using Siemens S55 on my PC which has bluetooth
> adapter.

How furiously are you sending GPRS packets?

> I am getting maximum 7-8 hour battery life when on GPRS using
> bluetooth.

Have you got BT visibility set to "off"?

Are you not able to charge the phone in situ, given that the
bottom connector is free?

> What is more energy/battery efficient? Serial cable (which
> comes free with Siemens S55) or Bluetooth?

I would have thought BT, but I don't know for certain.

John

Reply to this Message

asta - 18 Oct 2003 14:09 GMT

Hi !!!

BT uses a lot of battery. It has to check all the time
if there is anything to connect to in the neighbourhood.
Cable just sits there using nothing :-)

I use a lot of GPRS/laptop (about 100MB/month) with my
phone and to save battery, I shut off BT on the phone
after use.

cheers,

asta

"John Henderson"

> > I am using GPRS using Siemens S55 on my PC which has bluetooth
> > adapter.
[quoted text clipped - 12 lines]
>
> John

Reply to this Message

John Henderson - 18 Oct 2003 21:17 GMT

> BT uses a lot of battery. It has to check all the time
> if there is anything to connect to in the neighbourhood.
[quoted text clipped - 3 lines]
> phone and to save battery, I shut off BT on the phone
> after use.

I'm not seeing poor battery life on my S55 with BT activated
constantly. I'm getting several days from the battery, but I'm
not using GPRS. I don't get anything like this run time with
serial cable attached. As an RS232 DCE device, the phone has to
keep voltages (whether mark or space) up on the RX, CTS, DCD and
DSR lines. So electrically, it doesn't just sit there doing
nothing when a data cable's attached.

I have BT "visibility to others" turned off. This doesn't impede
its interactions with already-paired devices (headset and PC in
my case). It's obviously listening for session requests. But
presumably it's not broadcasting its presence, or responding to
any unknown devices.

John

Reply to this Message