No Skype-Siemens Gear in US

11 Comments

All of you US residents who have been lusting for that USB-adapter, Siemens Giga handset combination that has been the buzz of the web, well I have some bad news for you: you will not get it. Not today, not today anytime soon. Why? I asked for a review unit from Siemens folks and here is what their PR person emailed me back: “Siemens doesn’t have review units for this product, since it is not going to be available in the US market. I’m sorry we aren’t able to help.” Now if I am Skype, or Skype’s investor, I better find a way to get a similar contraption out in the US , which still remains one of the hottest market for Skype-service. Not having this device means, that making money from Skype Out service is still going to be tough.

11 Comments

Ed R

Today I’ve been reading http://www.ieee-secon.org/2005/abstracts/blackbird.pdf and some other information about the DECT technology. Because of this I dare to draw the conclusion that my interference problem is not caused by direct interference of DECT and IEEE 820.11n.

I now think my problem is caused by this:
A different source of interference comes from within the
network itself. Multiple nodes within range of one another
can attempt to transmit simultaneously, resulting in collisions.
For an intermediate node acting as a router, a received packet
is likely to be forwarded immediately, resulting in possible
interference with further incoming packets. This has the effect
of increased packet loss, as well as increasing backoffs that in
turn reduces throughput.

Data packets for my downloading from internet could very well be forwarded immediately. In the mean while data packets for my voice telephone line bounce of because they can’t be forwarded. Simpler said the download packets have priority over voice telephone line packets. Because my cablemodem connection is cheap and narrow the two data connections interfere rapidly in my cablemodem.

I don’t mean to say that widening my cablemodem connection would improve the situation because I would probably widen my download bandwidth too. Moreover the low frequency for the forwarding seems to be the problem. Increasing the bandwidth doesn’t increase this frequency.

Now that I know the cause I can imagine that using VOIP in stead of a tradional telephone connection could be a way to avoid this kind of interference. Data packets for the voice telephone line would then surely have the same priority as other data packets.

Another way to avoid this interference could be a cablemodem that forwards packets for voice telephonelines immediately. If then more packets of the downloading process would be lost, the download software could easily send requests to send lost packets a second time. For a downloading process that isn’t streaming television this would only be a slowdown, but not an annoyance.

A third solution would be a frequency of forwarding that’s high enough to forward all packets without any packet loss.

I’m not sure what to do with these vague conclusions yet. I do know I posted in the wrong discussion. DECT is using frequencies in the range of 1880-1900MHz and that is far from 2400MHz. So that is not the cause. Further I know I’ll stop my monologue here.

Ed R

I have tested it myself and it doesn’t really matter wich channel I use. Channel 3 seemed to be best, but also with that channel configured in the router I have interference when there is an increase in the download activity. When sites respond slow, then there isn’t much interference, but when they respond quick you can no longer hear what the other party is saying because you get an intermittent sound effect.

Switching my router from 11 n Max Speed to 11 b/g/n Mixed mode also didn’t bring much. First of all I don’t like doing this because I didn’t buy a router with a high wireless performance if I would want to work with less performance. Second It doesn’t reduce the interference.

My internet provider UPC suggested to put my router in another room. There it would be on a different fuse in the fusebox and the transmitted signals would be further away from eachother. Maybe it would work, but I don’t like this solution too because I want to use internet in every room of my appartment. Because of this my router must be close to the point where the internet enters my appartment. That’s where my cablemodem and my telephone connection also are. I don’t want the router anywhere else because I want to shield of my network with a the firewall from the router and I want my cables to go in one direction only.

If the internet enters my appartment in room A and I would have to put my router in a room far away, room B, then I don’t want a networkcable from room A to room B and another networkcable back from room B to room A. This would be necessary to bring the internet signal to a router in room B (away from the cablemodem in room A) and to bring the signal from behind the firewall back to networksockets in room A.

It would be bringing signal hence and forth because awkwardly designed equipment interferes with eachother when placed in one room. I suppose there is a neat solution that is still unknown to me.

Switching to a Philips VoIP8411B/01 might and might not solve something. My current DECT telephone is a Philips Zenia Voice 6626. This telephone definetely interfers with my NETGEAR RangeMax NEXT Wireless N router. Further I don’t want to abandon the answering machine of my current Philips set either.

So if somebody has some I would like to hear some neat solutions. I feel like I’m a bit stuck between interfering gear and beautiful promises about new gear that despite the promises might be as bad as my current gear.

Finally I would think that it can’t be so hard to find a trustworthy technological solution for predictable interference problems. Why doesn’t a DECT phone participate in the wireless 11 n network traffic. The the wireless router could pick up the wireless signal and make it an ordinary telephone signal without causing any interference. How come wireless N internet and DECT telephony aren’t integrated into one product for dual telephony, wireless internet and LAN-networking. One could construct a product that wouldn’t have any interference problems.

Ed R

jyden,

If DECT doesn’t exist in the 2,4GHz band, then why does it interfere with my wireless gigabit router, NETGEAR WNR854T RangeMax Next Wireless N? When I am busy on the internet wirelessly, then one can’t hear the other party too well. (The other party can hear me without a problem.)

Can I do something about this by changing channel (1 through 13 in the 2,4GHz band) on the router? If so, what channel is best? Should I switch to Philips VoIP8411B/01 (see http://www.consumer.philips.com/consumer/nl/nl/consumer/cc/_productid_VOIP8411B_01_NL_CONSUMER/Internet–DECT-phone+VOIP8411B-01)/. Or will this model have the same interference.

Is the problem related to the location of the router near the cablemodem or rather to using the router and the DECT telephone in the same room?

I hope you still read around here,

regards,

Ed R.

jyden

“a DECT phone that work’s in the 2,4GHz band and it’s devloped for Skype”
I am sorry that’s not possible since DECT dont exsist in the 2,4gHz band. DECT uses bands around 1,9gHz

jyden

I can give you a link to a DECT phone that work’s in the 2,4GHz band and it’s devloped for Skype by a danish firm RTX. Sold as Olympia cordless Dualphone.

http://www.dualphone.net/

Hope it’s usable. jyden

Paul Finnigan

A USB phone connector (adapter) is available in the U.S. and is being used by thousands of Skype users. The “PhoneConnector” is also being promoted by Microsoft for use with the Live Communication Server and TeleSym (Intel/Siemens) for their SymPhone. IM with a cordless phone is wonderful

Anonymous

I cant believe that skype isn’t planning this release. I use skype, and find the quality to be better than regular phone lines, and certainly better than cell phones. (and free at that) I guess i’ll have to homebrew a reciever phone!

Bryce

The why is that this Gigaset, like every other cool Gigaset before it, uses DECT running on frequencies that are licensed in the US (1880-1900MHz).

The HomeRF crew were supposed to bring us DECT in 2.4GHz, but we all know how that turned out.

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