The present standard is sub-part 1 of part 2 of a multi-part deliverable covering Transport and Traffic Telematics (TTT); Dedicated Short Range Communication (DSRC) transmission equipment (500 kbit/s / 250 kbit/s) operating in the 5,8 GHz Industrial, Scientific and Medical (ISM) band, as identified below: 
Part 1: "General characteristics and test methods for Road Side Units (RSU) and On-Board Units (OBU)"; 
Part 2: "Harmonised Standard covering the essential requirements of article 3.2 of the Directive 2014/53/EU"; 
Sub-part 1:    "Road Side Units (RSU)"; 
Sub-part 2:  "On-Board Units (OBU)". 
Part 3-1:  Technical characteristics and test methods for High Data Rate (HDR) data transmission equipment operating in the 5,8 GHz Industrial, Scientific and Medical (ISM) band. 
The present document applies to Transport and Traffic Telematics (TTT) systems: 
• with a Radio Frequency (RF) output connection and specified antenna or with an integral antenna; 
• for data transmission only; 
• operating on radio frequencies in the 5,725 GHz to 5,875 GHz Short Range Devices frequency band. 
The applicability of the present document covers only the Road Side Units (RSU). 
The present standard complies with the Commission Implementing Decision 2013/752/EU and CEPT/ERC Recommendation 70-03. It is a specific standard covering various TTT applications.