MIL-HDBK-1300A
TAC02 provides message transfer over a wide variety of tactical communications circuits. TAC02 is particularly appropriate for transferring data over circuits where other protocol suites operate poorly or not at all. It provides a flexible, reliable data communications protocol that operates in full-duplex,
and simplex modes. TAC02 operates in synchronous and asynchronous modes. TAC02 operates with forward errorcorrection devices, encryption devices, and communication channels such as satellites, telephones, or local area networks. The mandatory ranges of various parameters are specified in the MIL-STD-2045-44500.
5.6.2 Technical Interface Specifications (TIS). The series of TIS documents outline the specific requirements for using various Communication Security Equipments (C0MSEC) with the TAC02 protocol suite. The documents used as tested technical guidance for communications interfaces. The current TIS documents are describe interfaces to four types of C0MSEC equipment. The KY-57/58 TIS covers applications using the Vinson Half-Duplex Combat Net Radio voice and data encryption equipment. The KY-68 Digital Subscriber Voice Terminal TIS covers applications using the Tri-Service Tactical Communications (TRI-TAC) and Mobile Subscriber Equipment (MSE) voice and data encryption equipment. The KG-84 TIS covers applications using the general purpose digital data encryption equipment. The STU-III TIS covers applications using the Secure Telephone Unit-Third Generation over public and government voice telephone circuits.
5.6.3 Forward Error Correction (FEC). Devices communicating over tactical data circuits generally require forward error correction to achieve the desired reliability and throughput. In many cases, FEC methods vary from system to system and are specific to modems, radios, and other elements of communication hardware. To avoid the interoperability problems that arise from incompatible FEC methods, TAC02 systems are required to implement specified standard FEC
protocols (Effectivity 7) and, to the extent possible, should be able to bypass any nonstandard protocols or devices. The FEC method for TAC02, as specified in MIL-STD-2045-44500, is based on an efficient, byte-oriented Reed-Solomon coding scheme. These coding methods are implementable in
the same software environments that support TAC02 network protocols and are specified for use with the HDLC and SLIP datalinks defined by TAC02. No special processing power is necessary to implement the FEC software. The routine inclusion of standard FEC protocols as part of TAC02 implementations provides high throughput, reliable data transfer, and a level of interoperability among disparate systems that would be absent otherwise. BERT also is specified for TAC02 systems, allowing the systems to be configured more readily for various communications resources.
5.6.4 Non G0SIP DISN protocols. (Effectivity 1).
5.6.5 G0SIP protocols. (Effectivity 2).
5.6.6 Command WAN protocols. (Effectivity 3).
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