Tiêu chuẩn Phoneline mạng đã được phát triển bởi một nhóm ngành công nghiệp gọi là HomePNA hoặc đôi khi chỉ HPNA (Home Phoneline Networking Hiệp hội; ). Bạn sẽ tìm thấy một số loại HPNA có sẵn: HPNA : HPNA tiêu chuẩn đầu tiên hoạt động ở tốc độ chậm hơn (1,3 Mbps) | Chapter 5 Choosing Wireless Home Networking Equipment 97 Range and Coverage Issues An AP s functional range the maximum distance from the access point at which a device on the wireless network can receive a useable signal and coverage the breadth of areas in your home where you have an adequate radio signal are important criteria when selecting an AP. Wi-Fi equipment is designed to have a range of up to 100 meters when used outdoors without any obstructions between the two radios. Coverage depends on the type of antenna used. Just like it s hard to know how good a book is until you read it it s hard to know how good an AP is until you install it. Buying an AP is definitely the type of thing for which you do your research ahead of time and hope that you make the right choice. Buying ten APs and returning the nine that you don t want is simply impractical. Well maybe not impractical but rather rude. The key range and coverage issues such as power output antenna gain or receive sensitivity which we cover in Chapter 2 aren t well labeled on retail boxes. Nor are these issues truly comparable among devices either because of the same lack of consistent information. Because many of these devices are manufactured by using the same chipsets performance usually doesn t vary extensively from one AP to another. However that is a broad generalization and some APs do perform badly. Our advice Read the reviews and be forewarned In Chapter 2 we tell you about the differences in range between g systems and systems with the latter having slightly less range all other things being equal. Of the many good reasons to go for systems a big one is the lack of interference in the 5 GHz frequency range. And if you have range issues we help you figure out how to boost that range and your throughput in Chapter 18. Manageability When it comes to installing setting up and maintaining your wireless network you ll rely a lot on your device s user interface so check reviews
