Telecommunication Port

Description

The term 'Telecommunication port' is defined in 3GPP specifications as ports which are intended to be connected to telecommunication networks (e.g., public switched telecommunication networks, integrated services digital networks), local area networks (e.g., Ethernet, Token Ring) and similar networks. This definition is primarily used in the context of electromagnetic compatibility (EMC) and safety requirements for equipment. It appears in specifications such as TS 21.905 (Vocabulary), TS 25.113, TS 34.124, TS 36.113, TS 36.124, TS 37.113, TS 37.114, TS 38.113, TS 38.114, and TS 38.175.

The telecommunication port is a physical interface on equipment that allows connection to external networks. It is a key concept in EMC standards, as it defines the boundary at which conducted emissions and immunity requirements apply. For example, CISPR 22 (and later CISPR 32) specifies limits for conducted disturbances on telecommunication ports. The 3GPP specifications reference these international standards to ensure that mobile equipment and infrastructure comply with regulatory requirements.

In the context of 3GPP, telecommunication ports are relevant for user equipment (UE), base stations (e.g., NodeB, eNodeB, gNB), and other network elements. The ports may be used for data, voice, or signaling connections. They can be wired (e.g., Ethernet, DSL) or wireless (e.g., antenna ports), but the definition typically focuses on wired ports that connect to external networks. The port's characteristics, such as impedance, signal levels, and connector type, are specified to ensure interoperability and EMC compliance.

The definition of telecommunication port has evolved slightly over releases. In early releases (Rel-4 to Rel-7), the definition referenced CISPR 22. From Rel-8 to Rel-16, the definition remained the same but included the reference to CISPR 22. In Rel-17 and Rel-18, the reference was updated to CISPR 32, reflecting the replacement of CISPR 22 by CISPR 32 in international EMC standards. Rel-19 continues with CISPR 32. This change ensures alignment with the latest international standards.

Overall, the telecommunication port is a fundamental concept for ensuring that 3GPP equipment meets regulatory EMC requirements. It helps manufacturers and test labs identify which ports are subject to specific tests and limits, thereby facilitating global market access for mobile devices and infrastructure.

Purpose & Motivation

The definition of 'Telecommunication port' exists to provide a clear and standardized boundary for applying electromagnetic compatibility (EMC) and safety requirements to equipment connected to telecommunication networks. Without such a definition, it would be ambiguous which ports on a device are subject to conducted emission and immunity tests, leading to inconsistent compliance and potential interference with other networks.

The concept is rooted in international EMC standards, particularly CISPR 22 and later CISPR 32, which specify limits for telecommunication ports. 3GPP adopted these definitions to ensure that mobile equipment and network infrastructure comply with global regulatory requirements. This is essential for the free movement of goods and for protecting the radio spectrum and wired networks from interference.

Historically, the term was introduced in 3GPP Release 4, aligning with the then-current CISPR 22. As technology evolved, the reference was updated to CISPR 32 in Rel-17 to reflect the latest standard. The definition has remained otherwise stable, demonstrating its foundational nature. The telecommunication port concept continues to be relevant for 5G and beyond, as equipment becomes more complex and interconnected.