tailieunhanh - The next great telecom revolution phần 6

Các chuỗi dao động ở tần số 17 quãng tám cao hơn so với những người của một cây đàn guitar thực sự, hoặc cao hơn khoảng lần. Các nhà nghiên cứu gần đây đã quan sát thấy rằng ánh sáng từ tia laser có thể gây ra các thiết bị nhỏ được thiết kế đúng dao động, | 106 THE INTERNET RULES IP TECHNOLOGIES provided by broadband Internet connections. Overall by 2007 the . IP telephony market is forecast to grow to over 5 million active subscribers says In-Stat MDR s Schoolar. While this shows a fivefold increase in subscribers over 2002 it still lags . plain old telephone service POTS with over 100 million households. As interest in VoIP grows the private line business suffers. Once the cash cow of data transport the future of private line services is in jeopardy as the world slowly migrates to IP. Whereas the bottom hasn t yet fallen out on private line expenditures . businesses spent roughly 23 billion on private line services in 2003 up about 4 percent In-Stat MDR expects that growth will stagnate in the near term with this market facing an eventual and pronounced decline in the long term. The reality is that the public network is migrating to IP meaning traditional circuit-switch private lines will need to migrate as well says Kneko Burney In-Stat MDR s chief market strategist. Today the most common migration path is primarily to switch to a high-end version of DSL such as HDSL and this is likely to escalate over time as DSL reach and capabilities broaden. However this migration will be gradual says Burney meaning that the T1 businesses will experience a long slow and possibly painful exit as replacement escalates similar to that experienced by long distance and now local phone service. Burney believes that traditional T1 providers may be able to manage the erosion through innovation meaning stepping up plans to offer integrated T1 lines and by focusing on specific segments of the market like midsized businesses those with 100 to 999 employees . According to In-Stat MDR s research respondents from midsized businesses were somewhat less likely than their peers from both smaller and larger firms to indicate that they were planning or considering switching from T1 to integrated T1 cable or S H or VDSL alternatives says