Why the optical transceiver module of 1G presents its storage with 1.25 G?

Some people want to know whether there is difference between 1G and 1.25G of optical transceivers. Let me tell you.

A standard average transmission rate is about 155.520Mb/s, which is also known as STM-1.

The transmission rate of optical modules depends on this data by multiplying, such as STM-4 equals to 155.520×4=622.020Mb/s, often known as 622M.

The optical transceiver module of 1G, indeed is 1.25G, also known as STM-8, which also refers to 155.520×8=1244.16Mb/s.