The paper presents some problems encountered in running the ATM network for Hebei Electric Power Company, such as virus attacks causing excessive connection requests and service refusal, interconnection problems due to different software versions, voice service support, and hardware maintenance.

The paper introduces the impact of time delay on QoS of different services,including voice service and general data service,expatiates the conceivable infection with the time delay based on the constellation system,to confirm the selection of satellite orbit altitude as constellation design.

This paper presents voice services of the intelligent network s services in China analyses the implementation characteristics and the use range of all servicesand from several sidespresents the existing kinds and the trend of development about the voice services of the city s intelligent network in China.

With the purpose of writing this paper is under the direction of construction network which analyses forecast of voice portfolio and MOU value trend, which also is the groundwork for telephone mobile consumer and MOU value forecast, and which forecast the Erlang of telephone mobile consumer e.

Realization and efficiency analysis of conversational voice services in wireless local area networks;