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An amateur radio net, or simply ham net, is an "on-the-air" gathering of amateur radio operators.Most nets convene on a regular schedule and specific frequency, and are organized for a particular purpose, such as relaying messages, discussing a common topic of interest, in severe weather (for example, during a Skywarn activation), emergencies, or simply as a regular gathering of friends for ...
A minimal definition of reliable multicast is eventual delivery of all the data to all the group members, without enforcing any particular delivery order. [1] However, not all reliable multicast protocols ensure this level of reliability; many of them trade efficiency for reliability, in different ways.
Radiogram forms facilitate a standard protocol between amateur radio operators, allowing much faster relay of formal messages. They do this by always having the message headers in a certain order, allowing operators to read and understand the headers without explicit verbal labels.
Protocol Creator First public release date License Identity (not inc. alias) Asynchronous message relaying Transport Layer Security End-to-end encryption Unlimited number of contacts Bulletins to all contacts One-to-many routing [a] Spam protection Group, channel or conference support Audio/VoIP support Webcam/Video Batch file sharing
This interface typically uses TCP/IP based protocols for e.g. Simple Mail Transfer Protocol ( SMTP ) Generally, it is the responsibility of MMSC to do the transformation of MMS multi-part binary data to MIME format of email in both the direction MM3 is used in the following actions:
Packet radio networks rely on the AX.25 data link layer protocol, derived from the X.25 protocol suite and intended specifically for amateur radio use. Despite its name, AX.25 defines both the physical and data link layers of the OSI model. (It also defines a network layer protocol, though this is seldom used.) [10]
An application instantiates the session with the Session Description Protocol (SDP) over Session Initiation Protocol (SIP) or other rendezvous methods. The MSRP protocol is defined in RFC 4975. [1] MSRP messages can also be transmitted by using intermediaries peers, by using the relay extensions defined in RFC 4976. [2]
Traversal Using Relays around NAT (TURN) is a protocol that assists in traversal of network address translators (NAT) or firewalls for multimedia applications. It may be used with the Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). It is most useful for clients on networks masqueraded by symmetric NAT devices.