name: TPKT
full_form: Transport Packet
context: TCP is a stream-based protocol and has no inherent message delineation capability. Since the upper-layer protocols are not self-describing, ITOT, also referred to as TPKT, as defined in RFC 1006 [27] and later updated by RFC 2126 [28] is used to encapsulate the CC and connectionStatus messages before handing them off to TCP. Therefore, TPKT shall be required and used in the transport stack of the CC delivery interface (e.g. CC messages/TPKT/TCP/IP). Only protocol class 0 defined in RFC 2126 [28] shall be supported. However, the TPKT connection establishment and negotiation mechanisms shall not be used. The maximum TPDU size to be supported is the default maximum TPDU size specified in [28] and is not negotiated. Consequently, the segmentation and reassembly procedures associated with TPKT will not be used. In case the TPKT connection establishment is not provided, based on agreement between the Operator and LEA, the TPDU header included in the TPKT payload (TPDU field defined in RFC
description: Transport Packet (TPKT) is a protocol used for encapsulating upper-layer protocols to provide message delineation capability over stream-based protocols like TCP. It is defined in RFC 1006 and updated by RFC 2126.
explanation: The text explicitly states that TPKT is a protocol used for encapsulation, referencing RFCs that define its usage and behavior. This classification aligns with the definition of a protocol as a set of rules governing data transmission.
section_title: G.3.1.1.2	Use of TPKT
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