Definition of Quatrain. A poem, unit or stanza of four lines of verse, usually with a rhyme scheme of abab or its variant, xbybâ. âThe rhyming fourâline groups that make up the first eight or twelve lines of a sonnet are also known as quatrainsâ.
HSPF (Heating Seasonal Performance Factor) is a term used in the heating and cooling industry.HSPF is specifically used to measure the efficiency of air source heat pumps.he higher the HSPF rating of a unit, the more energy efficient it is. HSPF is a ratio of BTU heat output over the heating season to watt-hours of electricity used. It has units of BTU/watt-hr. Depending on the system, an HSPF â¥ 8 can be considered high efficiency and worthy of a US Energy Tax Credit.
OSPF is a link-state routing protocol that calls for the sending of link-state advertisements (LSAs) to all other routers within the same hierarchical area. Information on attached interfaces, metrics used, and other variables are included in OSPF LSAs.GP. The Border Gateway Protocol (BGP) routes traffic between autonomous systems. An autonomous system is a network or group of networks under common administration and with common routing policies. BGP exchanges routing information for the Internet and is the protocol used between ISPs.