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.
The Well-Known Ports are assigned by the IANA. Ports are used in TCP or UDP communications to name the ends of logical connections that transfer data. For the purpose of providing services to unknown clients, ports were created. Table C.1 specifies the port used by the server process as its contact port. The contact port is sometimes called a Well-Known Port. The assigned ports use a small portion of the possible port numbers. For many years the assigned ports were in the range 0-255. The range for assigned ports managed by the IANA has been expanded to the range 0-1023.