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Cellular Phone Forum / General / GSM / December 2004GSM 900 network in Washington, DC?
Seems to me that I recall that there was a "temporary" GSM 900 network set up in DC for some sort of GSM conference. When did this happen and how long was the network up? Also, just googling for GSM 900 network Washington DC I came upon a snippet from Telestial mentioning a GSM 900 network in DC. Does such a network still exist? - - - - - - - - - - - - - - - - - - - - - - - - - - >Seems to me that I recall that there was a "temporary" GSM 900 network >set up in DC for some sort of GSM conference. When did this happen [quoted text clipped - 3 lines] >- - - - - - - - - - - - - - - - - - - - - - - - - - > There is reason to believe it has happened more than once, and will likely continue to occur. The FCC has granted short term licenses for GSM 900 microcells to support specific international conferences on several occaisons in the Washington DC area. The channels the Microcell is assigned are specifically chosen to minimize interference with other services. the life expectancy of these networks is about a week. So they come, and they go fairly quickly. There are NO permanent 900 Mhz GSM networks in the USA. > > [quoted text clipped - 7 lines] > these networks is about a week. So they come, and they go fairly > quickly. There are NO permanent 900 Mhz GSM networks in the USA. If the US did not have to be different from the rest of the world they would be using GSM900 like everyone else!  Signature73 de Simon, VK3XEM. http://www.aca.gov.au/pls/radcom/client_search.client_lookup?pCLIENT_NO=157452 > If the US did not have to be different from the rest of the world they > would be using GSM900 like everyone else! Actually it's the other way around. The world standarized on 800mhz for cell phones, but the 800mHz service providers refused to give up their bandwith for GSM. GSM was originaly designed for SIM roaming, not handset roaming. It just so happened that all of Europe was able to kick the users of the 900 mHz band off, for example in the U.K. it was a citizen's band radio service. The irony of it is that when AT&T wireless wanted to upgrade from D-AMPS (TDMA), they found that C-AMPS (CDMA service) was vastly overrated and decided to go to GSM. At that time there was no 800mHz (GSM 850) so they had it built specially for them. If this had been done at the begining, GSM would have been 850 worldwide, not 900 in some places, 1800/1900* in others, and now 850 in the U.S. Geoff. * The 1800 and 1900 GSM bands overlap. Whether a phone operates on the 1800 or 1900 or both bands is not a technical issue, but one of regulatory approval and marketing. SignatureGeoffrey S. Mendelson, Jerusalem Israel gsm@mendelson.com IL Voice: 972-544-608-069 IL Fax: 972-2-648-1443 U.S. Voice: 1-215-821-1838 I may be an old fart, but I'm a high-tech, up to date old fart. :-) > Actually it's the other way around. The world standarized on 800mhz for > cell phones, but the 800mHz service providers refused to give up their > bandwith for GSM. Really? Let's see now - UK TACS 900MHz (launched 1985), Scandinavian NMT 450MHz (launched 1981) 900MHz (launched 1986), France NMT 450MHz (1989), Italy TACS 900Mhz (1990), Swiss NMT 900MHz (1987), Austria NMT 450MHz (1984) TACS 900MHz (1990), Spain NMT 450MHz (1982) TACS 900MHz (1990). I don't see many 800MHz services. > GSM was originaly designed for SIM roaming, not handset roaming. It just > so happened that all of Europe was able to kick the users of the 900 mHz > band off, for example in the U.K. it was a citizen's band radio service. Wrong again - GSM was originally the baby of CEPT (Confernce Europeene des Postes et Telecommunications), a standardisation arena which in the early 1980's included the European Administrations of Posts and Telecommunications of more than 20 European countries. In 1982 they were tasked to create a standardisation body to specify a unique radiocommunication system for Europe at 900MHz (as this band was already set aside earlier in 1978 for mobile communications in Europe). The body they created was "Groupe Special Mobile" (GSM) which held its first meeting in December 1982 in Stockholm. Only 31 persons from 11 counteries attended this meeting. In 1987 the famous GSM MoU was signed in Copenhagen (which was ammeded in 1991 to accept members of non-CEPT counteries and extend its scope to cover co-operations agreements with non-signatory bodies, with Australia signing up in 1992). In 1988 ETSI was created and the work done under CEPT was transferred over to ETSI. Later GSM was renamed to "Global System for Mobile communication". So I am afraid that your idea that "GSM was originaly designed for SIM roaming, not handset roaming" is just plain wrong. The whole point about the original GSM system was all about interworking across the CEPT countries (including service, billing, tariffs and security) just like the postal service. >If the US did not have to be different from the rest of the world they >would be using GSM900 like everyone else! If you knew any of the reason why the US does not use GSM 900 you would look a whole lot less foolish! The US didn't arbitrarily decide not to use GSM at 900 Mhz. Do a little research before you make silly statements. Sheesh! - - - - - - - - - - - - - - - - - - - - - - - - - - >> >> There is reason to believe it has happened more than once, and will [quoted text clipped - 9 lines] >If the US did not have to be different from the rest of the world they >would be using GSM900 like everyone else! The USA didn't use GSM900 because the frequency was already in use. SignatureBest regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES: John Navas <http://navasgrp.home.att.net/#Cingular >> >> [quoted text clipped - 10 lines] >If the US did not have to be different from the rest of the world they >would be using GSM900 like everyone else! Actually it is the other way around. At time GSM was being set up, it was no secreat that the 900Mhz spectrum in the USA was already mostly in use. That is a matter of public record, Consult any of the ITU spectrum allocation charts. The other problem is that unlike in most of the world, the constitution has this thing called the 'takings' clause. Basically ifyou want to displace people who are already licensed to use spectrum, you need to buy it back, you can simply seize it. However as I pointed out, the fact that the space allocated at 900 and 1800Mhz for Mobile phone service outside the USA, was already documented as having been assigned to and in use by other services long before there were any mobile phones using that spectrum. Well, I have been in the business in the Wash DC market for 20 plus years, and am an avid gear head, and havent heard of it. I certainly do not doubt that becuase of the nature of Wash Dc and that Technology can basically do whatever it wants to provided someone has the power and the money, do not doubt it. But, I can tell you this, I am located 12 miles from the Capital and my fleet of phones pick up NOTHING in 900 MHZ. > Seems to me that I recall that there was a "temporary" GSM 900 network > set up in DC for some sort of GSM conference. When did this happen > and how long was the network up? Also, just googling for GSM 900 > network Washington DC I came upon a snippet from Telestial mentioning > a GSM 900 network in DC. Does such a network still exist? > - - - - - - - - - - - - - - - - - - - - - - - - - - > Well, I have been in the business in the Wash DC market for 20 plus years, > and am an avid gear head, and havent heard of it. I certainly do not doubt > that becuase of the nature of Wash Dc and that Technology can basically do > whatever it wants to provided someone has the power and the money, do not > doubt it. But, I can tell you this, I am located 12 miles from the Capital > and my fleet of phones pick up NOTHING in 900 MHZ. According to Matt Weber's post, it's a ghost network and only appears when it wants to. Signaturejer email reply - I am not a 'ten' When GSM World or similar conferences appear in the US, they have permitted a microcell network for that purpose. There was such a network running for a week in Minnesota years ago as well. Similarly, I'm sure you'll find such a network at Motorola's development facilities. I don't understand the big deal. 900mhz is used for cordless phones. Opening up a few slices of the band for a week is no big deal. You can keep the transmtiters away from the fringes and away from known harmonics when you are dealing with this small a network. Stu >> Well, I have been in the business in the Wash DC market for 20 plus >> years, [quoted text clipped - 9 lines] > According to Matt Weber's post, it's a ghost network and only appears when > it wants to. >When GSM World or similar conferences appear in the US, they have permitted >a microcell network for that purpose. There was such a network running for >a week in Minnesota years ago as well. Similarly, I'm sure you'll find such >a network at Motorola's development facilities. I don't understand the big >deal. 900mhz is used for cordless phones. the bind is the pieces that you can use in the 900Mhz band are quite small ( literaly a couple of Mhz), the problem is usually where to put the other half, because you need to find the matching bandwidth in the other direction. As a result these tend to be microcells with very modest call capacity, nowhere near enough for normal commercial use. > Opening up a few slices of the >band for a week is no big deal. You can keep the transmtiters away from the [quoted text clipped - 16 lines] >> According to Matt Weber's post, it's a ghost network and only appears when >> it wants to. > Well, I have been in the business in the Wash DC market for 20 plus years, > and am an avid gear head, and havent heard of it. I certainly do not doubt > that becuase of the nature of Wash Dc and that Technology can basically do > whatever it wants to provided someone has the power and the money, do not > doubt it. But, I can tell you this, I am located 12 miles from the Capital > and my fleet of phones pick up NOTHING in 900 MHZ. There once was a GSM 900 network set up at an ITU conference, but I thought it was in Chicago, not Washington (but I may be wrong, don't count on the location). It was a very strange network, it was actually part of a Swedish network. The range was inside and around the convention center, not more than a square city block. The funny thing about it was that it made a profit. Geoff. SignatureGeoffrey S. Mendelson, Jerusalem Israel gsm@mendelson.com IL Voice: 972-544-608-069 IL Fax: 972-2-648-1443 U.S. Voice: 1-215-821-1838 I may be an old fart, but I'm a high-tech, up to date old fart. :-) "Geoffrey S. Mendelson" <gsm@mendelson.com> wrote in message > There once was a GSM 900 network set up at an ITU conference, but I thought > it was in Chicago, not Washington (but I may be wrong, don't count on the [quoted text clipped - 3 lines] > > The funny thing about it was that it made a profit. Really? Hundreds of cellphone users roaming in Swedish network and paying roaming fees it is not surprising at all. Yes, but only 900mhz users. I don't think the Ericsson I888 had hit the market. I don't remember whether it or the Bosch was the first world phone, but suffice it it to say that there weren't many multiband phones at the time. "Geoffrey S. Mendelson" <gsm@mendelson.com> wrote in message > There once was a GSM 900 network set up at an ITU conference, but I > thought [quoted text clipped - 5 lines] > > The funny thing about it was that it made a profit. Really? Hundreds of cellphone users roaming in Swedish network and paying roaming fees it is not surprising at all. >Yes, but only 900mhz users. I don't think the Ericsson I888 had hit the >market. I don't remember whether it or the Bosch was the first world phone, >but suffice it it to say that there weren't many multiband phones at the >time. The 900/1900Mhz phones is an electrical engineers nightmare come true. One of the reasons they took so long to come to market is the transmit side is a nightmare, and in fact is truly a worst case design scenario problem. > The 900/1900Mhz phones is an electrical engineers nightmare come true. > One of the reasons they took so long to come to market is the transmit > side is a nightmare, and in fact is truly a worst case design scenario > problem. How so and how does it differ from 900/1800 phones? Something to do with the fact that 1800 is approx half the wave-length of 900 where-as 1900 wasn't and matching transmitters/circuitry/antenna was tricky? PD SignaturePaul Day Web: www.bur.st/~paul GPG Key ID: 7FF655A8 |
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