All channel numbers with a D suffix indicate a repeater output frequency used in simplex mode (for example, LLAW1D is simplex on the output frequency of LLAW1).Please refer to the wiki article for notes regarding the use of CTCSS tones on Low Band, VHF, UHF, and 800 Public Safety Common frequencies.nteroperability. VTAC17/17D are the same as Marine Channel 25 and may only be used in areas at least 100 miles from a navigable waterway, and by ground stations only (no aircraft use permitted).
Port Numbers in URLs. Port numbers can also be specified using URL. For example port 80 is by default for HTTP. when you type a dot com in your browser the browser sends request in the form of http://www.domain.com:80/ to the server which responds and transfers data.
During March of 1990, they published a document where they listed all the well-known ports at that time. In that list there was no protocol assigned to port 80 (it jumped from 79 to 81): At that time, port 80 was officially free. In 1991, Tim Berners-Lee issued the first version of HTTP in a document where he stated: Then in July of 1992, RFC1060 was made obsolete by a new document where the following appeared: That document made 80 the official port for HTTP (www). However there is nothing about port 443 in that document.