…useful things. You can always beige-box a landline phone, violet-boxes should still work, I think a gold-box would still work, etc. If you want to dig deeper into how the PSTN works, a good, fun book is Understanding Telephone Electronics[8] by Carr, Winder, and Bigelow. Another interesting one is Digital Telephony[9] by Bellamy. Another "oldie but goodie" is Voice and Data Communications Handbook[10] by Bates and Gregory. Also, don't…
推荐看看：A. Michael Noll 写的《Introduction to Telephones and Telephone Systems》（第 3 版）：非常棒的系统级综述，涵盖了终端设备、传输介质、交换和信令技术。Carr、Winder 和 Bigelow 写的《Understanding Telephone Electronics》：侧重于电话系统的电子元件和工作原理。
Check out: Introduction to Telephones and Telephone Systems (3rd Ed.) by A. Michael Noll: A great system-level overview covering instruments, transmission media, switching, and signaling. Understanding Telephone Electronics by Carr, Winder, & Bigelow: Focuses on the electronic components and workings of telephone systems.
……有用的东西。固定电话随时都能搞 beige-box 监听，violet-box 应该还能用，我觉得 gold-box 应该也行，等等。如果你想深入了解 PSTN 的工作原理，Carr、Winder 和 Bigelow 写的《Understanding Telephone Electronics》[8] 是一本很有趣的好书。另一本很有意思的是 Bellamy 写的《Digital Telephony》[9]。还有一本“老当益壮”的经典是 Bates 和 Gregory 写的《Voice and Data Communications Handbook》[10]。另外，别……
…useful things. You can always beige-box a landline phone, violet-boxes should still work, I think a gold-box would still work, etc. If you want to dig deeper into how the PSTN works, a good, fun book is Understanding Telephone Electronics[8] by Carr, Winder, and Bigelow. Another interesting one is Digital Telephony[9] by Bellamy. Another "oldie but goodie" is Voice and Data Communications Handbook[10] by Bates and Gregory. Also, don't…
推荐看看：A. Michael Noll 写的《Introduction to Telephones and Telephone Systems》（第 3 版）：非常棒的系统级综述，涵盖了终端设备、传输介质、交换和信令技术。Carr、Winder 和 Bigelow 写的《Understanding Telephone Electronics》：侧重于电话系统的电子元件和工作原理。
Check out: Introduction to Telephones and Telephone Systems (3rd Ed.) by A. Michael Noll: A great system-level overview covering instruments, transmission media, switching, and signaling. Understanding Telephone Electronics by Carr, Winder, & Bigelow: Focuses on the electronic components and workings of telephone systems.