A network diagnostic component or device that is placed in-line between a first and second node. The diagnostic component or device is used to compress a random data signal. For example, the first node may communicate with the second node using a random data signal that includes random data units that represent a first data unit. In some embodiments, the random data signal may be of the Serial Attached Small Computer System Interface (“SAS”)/Serial Advanced Technology Attachment (“SATA”) protocol. The network diagnostic component may receive the random data signal and associate at least one random data unit with identifier that is indicative of the first data unit. This random data unit may be recorded in a memory. A representation of the random data units that are different from the random data unit associated with the identifier is also recorded in the memory.