Re: Cingular Connection Manger tweeks
- From: John Navas <spamfilter0@xxxxxxxxxxxxxx>
- Date: Tue, 28 Mar 2006 16:45:28 GMT
[POSTED TO alt.cellular.cingular - REPLY ON USENET PLEASE]
In <0D0Vf.59372$Jd.58642@xxxxxxxxxxxxxxxxxxxxxxxxxx> on Sat, 25 Mar 2006
01:00:44 GMT, DecaturTxCowboy <forgetit@xxxxxxxxxx> wrote:
For the past three weeks, my Bluetooth tethered V557 was having terrible
connection speeds using Cingular's Connection Manager and Windows DUN
for both Accelerated and Non-Accelerated connections.
Presumably you're using Data Connect, since MEdia doesn't support Acceleration
-- correct?
A CNN page would take several minutes to load, FTP and NG would time
out. Watching the Windows DUN data counter, you could see my speeds were
less than 10 KBps (or 1Kbps roughly) or it would just sit there with
absolutely no data getting downloaded. Sometimes I would get decent
speeds (60 Kbps+), but usually it was much slower 90% of the time,
regardless of the time of day or night (no it wasn't a cell loading
issue), nor was it location related across the county.
A call to Cingular laptop tech support two weeks ago only had me check
my settings and she pushed something down to my phone. No improvement
and it only got worse by now.
Today, support had me change two things in the Cingular Connection
Manager. Under Tools and Settings:
1) Advanced Networking tab > Change from "Use default OS value" to
"Optimized Wireless Data value" Don't reboot yet.
That simply increases the Windows global RWIN (TCP/IP receive window) from the
default (16K in Windows XP) to 64K. Unfortunately, that will tend to be
counterproductive in most situations, since speed and latency of EGPRS(EDGE)
aren't high enough to warrant such a large value, and since that will increase
the time for detection and recovery when a packet is lost. (See
<http://cable-dsl.home.att.net/#WhyItMatters>) Also, this change will affect
*all* Windows TCP/IP networking, not just the Cingular Connection Manager.
2) Acceleration tab > Click Uninstall. Now you can reboot.
That eliminates Acceleration, which can be a significant boost to speed with
Data Connect. Also, since Acceleration can be turned off, this tweak
shouldn't matter unless the Cingular software isn't working properly.
I'm now getting 60 Kbps to 80 Kpbs speeds with an occasional drop in
speed, but otherwise a vast improvement.
As I've noted above, these tweaks shouldn't really matter, much less help.
If they do, then either something must have really been screwed up (e.g.,
improper configuration settings, software not working properly) or Cingular
data service must be really bad in your area (e.g., very high latency).
When I use the Windows DUN, the problem comes back. Apparently there IS
a difference in using the Cingular Connection Manager and Windows DUN.
Indeed there is, but there is also interaction between them, as noted above,
and as shown in my controlled tests with MEdia (not Data Connect) over Windows
XP SP2 Bluetooth to a Motorola V551 using the Intel Broadband Speed Test
<http://www.intel.com/personal/resources/broadband/speedtest.htm> to measure
throughput in kilobits per second (10 trials each):
1. Windows DUN (port speed 460000 bps):
Mean 78.66
Median 85.05
Minimum 61.9
Maximum 88.3
2. Motorola Phone Tools 4.0.4b (default settings):
Mean 70.14
Median 65.75
Minimum 52.2
Maximum 90.1
3. Cingular Connection Manager:
I tried versions 5.1.10 and 5.2.19, and both resulted in terrible connections
(very long stalls), even when your tweaks were applied. (See Note 1.) Worse,
both caused Windows DUN to exhibit the same behavior, suggesting that a lot of
reported data problems are due to running or having run Cingular Communication
Manager. To restore normal Windows DUN performance, I had to run Motorola
Phone Tools (once).
Of course, this improvement would not apply to the San Francisco Bay
area as users there never have any problems.
Windows DUN works well in any location *when* configured properly *and* not
screwed up by Cingular Connection Manager. The usual problem is the
configuration, not the location. My advice, particularly with MEdia (rather
than Data Connect), is *not* to install Cingular Communication Manager. If
you have, it may be difficult to undo the damage if you don't have a Motorola
phone and Motorola Phone Tools software. (See Note 2.)
Notes:
1. Cingular Connection Manager (the version I tested at least) works by
creating a Windows DUN connection called "GSM", but the settings are weird,
which may be part of the problem.
2. Motorola Phone Tools is obviously a good choice for those with Motorola
phones *except* that the Windows DUN connection it creates (called "Cingular
GPRS") has a port speed of only 115200 bps. For better results this should
probably be increased (in Control Panel -> Network Connections) to 460000 bps
(or at least 230000 bps).
--
Best regards, SEE THE FAQ FOR CINGULAR WIRELESS AT
John Navas <http://en.wikibooks.org/wiki/Cingular_Wireless_FAQ>
.
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