NetOptics 10/100BaseT Port Aggregator Tap is a replacement for my Finisar model. The device has a single output, which removes the need for combining two TX outputs. Buffered memory handles an overflow of up to one megabyte per side of the full-duplex connection. This memory clears automatically once the NICs utilization is again below 100 percent. The product will be available in a standard rack-mount model, or a PCI-based unit designed for direct insertion into monitoring hardware.”]
Source: https://taosecurity.blogspot.com/2004/01/new-taps-from-netoptics-thanks-to.html