SDH to DWDM

Dear friend!
Please wait a moment!

1，before OTN the DWDM just change the wavelength from 1310/1550nm to one of lambda between 192.10 and 196.00
2, ON the OTN DWDM you can understand it's like MSTP equipment the single from sdh to Ethnet
both SDH and Eth signal has different frame structure so its just frame structure transfer and take different lambda in the DWDM system.

Dear friend! 

SDH signals are client-layer services of WDM services. 

1.  SDH signals (STM-N, N=1, 4, 16, 64) are output to tributary boards (such as TDX) of WDM equipment through SDH boards (such as SL64). 

2.  After receiving the STM-N signal, the TDX board encapsulates the STM-N signal into an ODUX signal (X = 0, 1, 2, 3, 4). 

3.  The local WDM equipment sends the ODUX signals to the opposite WDM equipment. 

4. The TDX board on the peer WDM device restores the ODUX signals to STM-N signals and sends the STM-N signals to the client-side SDH device.

I hope my answer will help you!

Thank you！

@liqiang185 Thank you for your response.

So what i get from your response is that SDH signal (STM-N etc) first enter into TDX (tributary board) and then it encapsulated into ODU1 ODU2....ODU8 and then it MUX and DMUX according to side.

And OTU board change the dynamic signal into stardand signal so after TDX signal enter into OTU?

The OTU board can directly encapsulate STM-N signals into OTUX signals and output standard wavelength optical signals that comply with WDM system requirements. 

 In this scenario, electrical-layer cross-connections are not required. It is inconvenient to flexibly schedule services. It is usually used at the end NE of a WDM network. or in point-to-point communication. 

Such as LDX board：

Thanks！

Simple One:

Site A: SDH low granuluality cardSTM 1, 4,16) -SDH high granulaulity card (STM64/16, non colour, 1310nm /1550nm)- DWDM tributary card(ODUK)+ Line card(lamba, color signal)- DWDM MUX card(Multiple lambda's)- DWDM optical layer(optical routing)

Site B: DWDM optical layer- DWDM MUX card- DWDM Line card- DWDM tributary card-SDH high granulaulity card(STM64/16)-SDH low granulaulity card(STM1, STM4, STM16 etc)