Telecom-history
来自Jack's Lab
(版本间的差异)
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[https://www.nexmo.com/blog/2017/04/18/a-history-of-telecommunications-how-telecoms-became-just-another-interface/ history of telecommunication ] | [https://www.nexmo.com/blog/2017/04/18/a-history-of-telecommunications-how-telecoms-became-just-another-interface/ history of telecommunication ] | ||
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+ | [http://csc.columbusstate.edu/summers/notes/cs457/chapt8.htm WAN] |
2018年9月13日 (四) 10:29的版本
目录 |
1 简介
2 local loop
2.1 模拟电话
2.2 Modem
2.3 ISDN
- 用户端负责D/A转换(之前是电信局端做D/A转换, 用户到电信是模拟信号)
- 2B1Q调制类似QAM
2.4 xDSL
2.5 FTTx
3 trunk
3.1 FDM
3.2 T-carrier (T-1)
- codec: PCM
- multiplex TDM
3.3 PON
3.4 NG-PON2
4 电话交换
4.1 人工
4.2 电磁交换
CT380:Strowger Step-by-step Demonstration
AT&T Archives: The Step-By-Step Switch