Alan Ryan wrote:
> Hi Michael,
>> That's a pretty comprehensive answer - I guess I'll go looking for a wired
>> 2009/3/5 Michael Watterson <watty at eircom.net>
We haven't even considered the issues on NAT traversal of "3"'s single
public IP network,
Peer to peer calls via IP if the destination is on 3G (may not be
connected and very dynamic or few public IPS) and isn't running presence.
3rd Party call provider (e.g. Blueface) phone number based incoming
calls to your 3G/HSPA
It's not always on either.
Yet mysteriously "3" has won tender for the NBS for which minimum
connection (before 36:1 SUBSCRIBER (not connection) contention) is
supposed th be 1Mbps down and 128k up and support VOIP.
I met Minster Ryan this week and he told me his Experts and "3" have
assured him it will work. He (nor assistants) couldn't tell me what
would be monitored, how it would be monitored or what the penalty for
non-compliance would be as this is all part of confidential Contractual
3 will not supply ethernet NAT/Firewall/Router, but a USB dongle.
An ethernet connected solution (WiFi not important as easily added)
works with ANY OS. (Even TCP/IP on DOS!). Do all USB 3G/HSPA modems work
with all Linux Distros and Versions?
Dovado, Linksys, Draytek, Netgear, Dlink and others make ethernet
router/firewall/nat/WiFi boxes that can take various 3G/HSPA modems. In
a pinch you could put it outside in a plastic box powered by POE.
3's solution is to offer a femto repeater! One box sits at window sill
(indoor, mains powered) and other is 3G femto base. They are linked by
WiFi you can't access.
Energy saving Double Glazing blocks 3G/HSPA.
Only 6.5% of outdoor 2km radius cell can get the fabled 14.4Mbps
speed. Average sector throughput is about 1Mbps to 2Mbps , shared
between all users. More than 10 users simultaneously and average speed
is less than dialup. If there are 3 or more simultaneous connections,
then 75% of users on average per cell can't get more than 600Kbps.
Dark blue line is Sole User in sector moving from 500m (14.4Mbps) to 2km
from mast (< 1Mbps), outdoor.
Dark purple and light purple are 10 simultaneous and 45 simultaneous
users evenly spread in sector/cell and the resulting average speed
depending where you are.
The two flat horizontal lines are 10 simultaneous and 45 simultaneous
users evenly spread in a similar spectrum of Fixed Wireless Broadband
If you HAVE to use 3G/HSDPA/HSPA, tell everyone nearby it doesn't work
so more users won't be added.
Meteor, 3, O2, Vodafone.: The performance differences are due to how
many people per sector there are. If we assume 50:1 contention can be
lived with, then you can only have about 100 customers per mast,
hopefully none are 24x7 P2Pers... You can see why the Cap is low.
They charging 500x less for the data than phone package (10Gbyte vs
10Mbyte incoming calls and 10Mbyte outgoing calls per month). They
want to limit contention and usage.
The voice is subsidising it as in reality it should be x3 more expensive
>> Alan Ryan wrote:
>>>>>>> 2009/3/5 Alan Ryan <alan at codecrunchers.ie>
>>>>>>>>>>>>>>>> Hi Joerg,
>>>>>>>>>>>> The e270 is up and running, pretty reliable. Used a softphone today, but
>>>> the quality was pretty bad alright. I could hear them fine, but the
>>>> side said that there was a delay and terrible echo. Is it the e270 or
>>>> o2 connection that you think the problem might lie with?
>>>>>>>>>>>>>>> The problem is Mobile Internet, not specifically O2 or the Modem.
>>>>> It has 100ms to 2000ms latency, typically 150ms
>> High Jitter
>> speed varies from 0.050Mbps to 5Mbps +
>> Packet loss can be high or OK.
>>>> It's inherently unsuitable for VOIP. If more than about 10 people are using
>> your sector it's likely to be poor.
>> It's possible to get more consistent VOIP on 40Kbps dialup!
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!