I got these items in a batch of other surplus items and I'm trying to determine their use or value. If anyone on this list is interested, please send a note, or off to eBay they go. See http://www.threedee.com/optics/ for pictures and more detailed descriptions. One is a HP A3406A Fibre Channel Host Adapter. I wasn't able to find this part number on HP/Aligent's web site, and it produced few other web hits. This a HP-HSC card, as used in today's K-series of servers. It can sustain 1/4 gigabit rates. Another item is a HP 83441B SONET SDH reference receiver. Is this used in testing very high speed optical networking equipment? It supports 622 Mbps SONET OC-12 and SDH and STM-4. It has fiber input on one end and RF output on the other. Another interesting item is a 28-pin DIP that appears to be a 20 mw semiconductor laser. This is an XMT1300-1.2, an optical driver for Fibre Channel (FC-0). An optical fiber emerges from one end and terminates in a standard pigtail fiber connector. It is a 20 milliwatt, Class 3b semiconductor laser, probably GaAs, centered at 1300 nm. It was made in 1991, so I felt close enough to the 10-year rule to post. :-) It was made by BT&D Technologies (British Telecom + Dupont) in 1991, now part of Agilent Technologies, a Hewlett-Packard company. It is one of their "logic to light" transmitters. - John