在选购外置的Modem时,应仔细查看说明书上的性能参数和功能等,如联机速率、是否具有双工(Dupl ex)、传真(Fax)、语音(Voice)、硬件压缩、语音信箱、来电识别、语音数据同传等功能,其中前三项功能应该是必备的功能,后两项用户一般还用不到,不要也无妨。最有讲究的是选购内置Modem。拿到一块内置Modem卡,首先应仔细检查一下印刷电路板的制作工艺和点焊质量,如边角是否打磨、有无毛刺。电路板强度要高,否则在插拔卡时容易引起变形,从而导致种种故障产生。有些卡的焊点焊锡很少,虽然当时使用时不会有什么毛病,但用的时间一长或插 When purchasing an external modem, carefully check the performance parameters and functions described in the manual, such as online speed, Duplex, Fax, Voice, hardware compression, voicemail, Call identification, simultaneous interpretation of voice data and other functions, of which the first three functions should be an essential feature, the latter two users generally less than, do not do anyway. The most important thing is to buy built-in Modem. Get a built-in Modem card, first of all should carefully check the production process of printed circuit boards and spot welding quality, such as whether the corners polished, with or without glitches. Circuit board strength is high, otherwise easy to cause deformation in the plug-in card, resulting in a variety of failures. Some of the solder joints solder little, although the use of the time there will be no problems, but with a long time or plug