narrow band service 中文意思是什麼

narrow band service 解釋
窄帶業務
  • narrow : adj 1 狹 窄 狹隘的 狹小的 (opp broad wide)。2 有限的 受限制的;有偏見的 氣量小的 心眼兒窄的;眼...
  • band : n 1 帶,繩;帶形物;箍;箍條;嵌條;鑲邊;鋸條; 〈pl 〉 (法官等的)寬領帶。2 束縛,羈絆;義務;...
  • service : n 塞維斯〈姓氏〉。n 1 服務;工作;公務;職務;事務;業務;行政部門(人員),服務機構(人員)。2 ...
  1. As regards the development of the service layer, shanghai telecom s objective is to transit gradually from providing narrow - band data service as the dominant service to providing broadband data service as the dominant service. 6

    今後上海電信在業務層上的建設目標是:從以窄帶數據業務為主、兼顧寬帶數據業務,逐步發展為寬帶、窄帶業務並舉,最後達到以寬帶數據業務為主,兼顧窄帶業務。
  2. Provides various narrow and broadband access. it consists of broadband lan access equipment, adsl equipment, narrow band access equipment, broadband atm multipal service access wuipment, media gateway equipment, fibre, type five and wisted cable, etc

    提供各種寬、窄帶業務的接入,由寬帶lan接入設備、 adsl設備、窄帶接入網設備、寬帶atm多業務接入設備、媒體網關設備、光纖、五類線、雙絞線等組成。
  3. Current transformers are nonreplaceable in the field of protection and measurement for decades, but the electromagnetic current transformers can not meet the development of the electric power system for the reasons of magnetic saturation, ferro resonance, little dynamic range, narrow service band and so on 。 with the popularization of microcompute, it will be irreversible to apply microcompute in the protection and measurement, the equipments do not need the current transformer with high power, so the rogowski coil can apply on the field of protection and measurement

    電流互感器在繼電保護和電流測量中的作用長期以來具有不可替代的地位,但電磁式電流互感器所固有的磁飽和、鐵磁諧振、動態范圍小、使用頻帶窄等都難以滿足電力系統發展的要求。隨著微機的普及,在繼電保護和測量中應用微機已是不可逆轉的潮流,設備已不再需要高功率輸出的電流互感器,因此可以選用rogowski線圈作為低電壓輸出要求的電流測量和繼電保護應用。
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