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| glossary:glossary_h [2016/10/05 07:09] – [Handshaking] Bob Vetterlein | glossary:glossary_h [2018/04/26 09:20] – [HASL] Bob Vetterlein |
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| ===== Handshaking ===== | ===== Handshaking ===== |
| In information technology, telecommunications, and related fields, handshaking is an automated process of negotiation that dynamically sets parameters of a communications channel established between two entities before normal communication over the channel begins. It follows the physical establishment of the channel and precedes normal information transfer. | In information technology, telecommunications, and related fields, handshaking is an automated process of negotiation that dynamically sets parameters of a communications channel established between two entities before normal communication over the channel begins. It follows the physical establishment of the channel and precedes normal information transfer. |
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| | ===== HASL ===== |
| | [[https://en.wikipedia.org/wiki/Hot_air_solder_leveling|Hot Air Solder Leveling]]\\ HASL = hot air solder levelling - the bare copper of the etched PCB would soon oxidise and refuse to take solder, so a thin layer of "something" is added to make the shelf life longer. The standard HASL provided by Chinese manufacturers is leaded solder. More expensive options are lead free solder, organic solderable varnish stuff, nickel, or gold flash. |
| ===== Header plug or socket ===== | ===== Header plug or socket ===== |
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