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Netoptics work great. Check out their aggregation taps.
Some 4-port fiber gig taps, including Netoptics ones, drop frames when aggregate utilization exceeds 1 Gbit/s. That can be 500 east + 501 west or 1001 west, or 251 in each of 4 ports or whatever. I'd heard about a kiddie porn case getting tossed because the defense successfully argued law enforcement's tap may have dropped frames. I didn't believe it until I measured this myself with a packet blaster. I used VSS taps in my tests. Brian Chee of the University of Hawaii tried this before me with a Netoptics tap, with similar results: Endicott-Popovsky, B.E., Chee, B. and Frincke, D. Role of Calibration as Part of Establishing Foundation for Expert Testimony, in Proceedings 3rd Annual IFIP WG 11.9 Conference January 29-31, 2007, Orlando, FL. dn -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) iD8DBQFHULwTyPxGVjntI4IRAjaZAJ0eoGVzaxXh+TIuyx8tmfOlupj+LACfcFmI jUq2/DFjHiyrJRekjTnxnic= =s8IF -----END PGP SIGNATURE-----