12.a. Which measurement is used to determine CWDM and DWDM channel losses? A. Span loss B. Patch cord loss C. Optical return loss D. Splice loss 12.b. Two channels in an OSA measurement are located at 1542.5 nm and 1537.2 nm. What's the channel  spacing? A. 449 MHz B. 56.6 MHz C. 327 GHz D. 670 GHz

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Network transmission cabling

A network is a collection of devices connected by communication links. A device can be a computer or any instrument capable of sending and receiving data or information formed by other nodes toward the network. A channel that connects people or things is known as a network. It sends the data from one place to another. It is the basic concept of a computer, network, and data communications.