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https://www.optical-sintai.com/products/1u-plug-in-chassis.html

The 1U chassis plug-in CWDM products introduced by Sintai company are modular in design. Each CWDM card supports up to 18-wave CWDM multiplex/demultiplex. The CWDM card can be flexibly configured according to network requirements, which greatly saves customers' fiber resources.
The 1U chassis can provide 4 slots to support all types of CWDM cards. It is suitable for CWDM centralized deployment and is widely used in metropolitan area networks.

1U Plug-in Chassis Features
Low insertion loss
High channel isolation
High stability and reliability
Lightpath without glue process
2~18 channels are optional

Sintai is committed to providing a variety of China optical transport network systems and dwdm transponder.