SONET和DWDM的区别

1.同步光网络(SONET)：
SONET 代表同步光网络。这是一种通信协议，由 Bellcore 开发，用于使用光纤在相对较大的距离上传输大量数据。通过这种方式，多个数字数据流同时通过光纤传输。

2.密集波分复用器(DWDM)：
DWDM 代表密集波分复用器。这是将来自不同来源的数据放在光纤电缆上的模块。这些模块通过使用间隔很近的波长在同一条电缆上传输多个信号，进一步增加了系统带宽和容量。通道间距减小到 1.6 nm 或更小。在不更换光纤的情况下增加容量的经济有效的方法。有容量为 32 通道及以上的商用系统。

SONET 和 DWDM 的区别：

S.No.	SONET	DWDM
1.	SONET is a optical transmission interface.	DWDM is WDM utilizing closely spaced channels.
2.	In this, SONET aggregates a number of optical signals into higher bit rate signal for transmission over a single fiber using a single wavelength.	In this, DWDM assigns the incoming optical signals to specific frequencies multiplexes them for transport over a single fiber.
3.	It uses Time division multiplexing(TDM) or statistical TDM.	In this, multiple channels of information carried over the same fiber, each using an individual wavelength.
4.	These are technologies that are used as a buffer (interfacing) layer for higher layers.	It increases the bandwidth of systems, without using repeaters.
5.	The channel spacing can be carried over WDM, but not vice versa.	The channel spacing is small 200GHZ.
6.	The band used are STS-1 with fixed size frames.	The band used are C and L.
7.	It is easy to isolate one channel from a multiplexed circuit.	There is hundreds of channels is possible.
8.	The best application is ethernet cabling or public telephone network.	The best application is Long-haul.