Quais as principais diferenças entre as frequências GSM e CDMA?E porque as operadoras de telefonia abandonaram a CDMA?
E porque nos Estados Unidos essa frequência é bastante usada?!
E porque nos Estados Unidos essa frequência é bastante usada?!
Sua resposta
217 Respostas
CDMA
Significa: Code Division Multiple Access
Tradução: Acesso Múltiplo por Divisão de Código
Também surgiu da evolução do sistema analógico.
O sistema CDMA consiste na separação dos sinais por códigos de forma que vários terminais celulares consigam usar simultaneamente a mesma rádiofrequência.
Ou seja, com CDMA você pode tem um espaço muito maior para transferência de dados. Assim você pode usar seu celular como um modem para Internet banda larga, enviar arquivos pesados, acessar a Internet do próprio celular, etc.
GSM
Significa: Global System Mobile
Tradução Sistema Móvel Mundial
Surgiu nos anos 80, independende das outras tecnologias.
O sistema GSM é o melhor, mais avançado, e mais utilizado no mundo. Cerca de 72% dos usuários de telefonia móvel do mundo utilizam o GSM.
As vantagens são muitas: todos os dados do usuário são armazenados no SIM card (conhecido popularmente como “chip”). Dessa maneira, quando você muda de telefone, a sua agenda, mensagens, perfil, e todos os dados passam pro novo telefone. Funciona como se fosse o HD do celular, mas com a mobilidade de um CD, e o tamanho de uma moeda. Você pode trocar de operadora, e de número, simplesmente trocando de chip.
Com o GSM você também pode acessar a Internet, usar o telefone como modem de Internet banda larga pro seu computador em casa, transferir grandes arquivos, fazer vídeoconferências pelo celular, tirar fotos, etc. Como há muita concorrência, os aparelhos GSM são mais baratos. A cada 5 aparelhos lançados, 4 são GSM. Outra vantagem é o roaming mundial. Significa que você pode continuar usando o seu celular normalmente, em qualquer lugar do mundo, sem precisar fazer nada. E dentro do país, a tarifa é sempre local.
A melhor tecnologia:
Pelas vantagens oferecias, o GSM é disparadamente a melhor tecnologia.
Atualmente as operadoras que utilizam a tecnologia GSM são as seguintes:
- TIM
- Brasil Telecom
- Oi
- Claro
A TIM e a Claro também possuem a tecnologia TDMA.
Vivo- já utiliza as duas tecnologias.
Para saber sobre mais algumas coisa link da matéria.
http://kadu.ducz.com/2004/10/15/cdma-x-gsm/
Significa: Code Division Multiple Access
Tradução: Acesso Múltiplo por Divisão de Código
Também surgiu da evolução do sistema analógico.
O sistema CDMA consiste na separação dos sinais por códigos de forma que vários terminais celulares consigam usar simultaneamente a mesma rádiofrequência.
Ou seja, com CDMA você pode tem um espaço muito maior para transferência de dados. Assim você pode usar seu celular como um modem para Internet banda larga, enviar arquivos pesados, acessar a Internet do próprio celular, etc.
GSM
Significa: Global System Mobile
Tradução Sistema Móvel Mundial
Surgiu nos anos 80, independende das outras tecnologias.
O sistema GSM é o melhor, mais avançado, e mais utilizado no mundo. Cerca de 72% dos usuários de telefonia móvel do mundo utilizam o GSM.
As vantagens são muitas: todos os dados do usuário são armazenados no SIM card (conhecido popularmente como “chip”). Dessa maneira, quando você muda de telefone, a sua agenda, mensagens, perfil, e todos os dados passam pro novo telefone. Funciona como se fosse o HD do celular, mas com a mobilidade de um CD, e o tamanho de uma moeda. Você pode trocar de operadora, e de número, simplesmente trocando de chip.
Com o GSM você também pode acessar a Internet, usar o telefone como modem de Internet banda larga pro seu computador em casa, transferir grandes arquivos, fazer vídeoconferências pelo celular, tirar fotos, etc. Como há muita concorrência, os aparelhos GSM são mais baratos. A cada 5 aparelhos lançados, 4 são GSM. Outra vantagem é o roaming mundial. Significa que você pode continuar usando o seu celular normalmente, em qualquer lugar do mundo, sem precisar fazer nada. E dentro do país, a tarifa é sempre local.
A melhor tecnologia:
Pelas vantagens oferecias, o GSM é disparadamente a melhor tecnologia.
Atualmente as operadoras que utilizam a tecnologia GSM são as seguintes:
- TIM
- Brasil Telecom
- Oi
- Claro
A TIM e a Claro também possuem a tecnologia TDMA.
Vivo- já utiliza as duas tecnologias.
Para saber sobre mais algumas coisa link da matéria.
http://kadu.ducz.com/2004/10/15/cdma-x-gsm/
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Li hoje que a GSM tem mais radiação que a CDMA:
http://www.rimweb.in/forums/topic/31271-radiation-risk-are-cdma-cellphones-more-dangerous-than-gsm/
É um forum com discussões.
http://www.rimweb.in/forums/topic/31271-radiation-risk-are-cdma-cellphones-more-dangerous-than-gsm/
É um forum com discussões.
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