IEC 62488-3-2021 pdf Power line communication systems for power utility applications – Part 3: Digital Power Line Carrier (DPLC) Terminals and hybrid ADPLC Terminals

4 Generic structure of DPLC and ADPLC terminals The generic structure describes the main building blocks of DPLC and ADPLC terminals. All other building blocks which are necessary for proper functioning (e.g. power supply, device control units) are not considered in Clause 4. Figure 2 shows the block diagram of a DPLC terminal with the digital and analog interfaces on the left side and the HF line interface on the right side. If only one interface is available, the function of the time division multiplexer / demultiplexer and optional Ethernet switch may be replaced by a simple direct connection to the digital PLC modem. The resulting pass band signal is amplified and matched to the coupling device using the power line interface.
Figure 3 shows the block diagram of an ADPLC terminal, which contains both a digital PLC modem as well as an analogue SSB modem, compliant with IEC 62488-2, that shall be used to convey signals coming from teleprotection or analogue I/O interfaces, with the digital and analogue interfaces on the left side and the HF line interface on the right side. An ADPLC terminal contains a digital PLC path, that was introduced above and shown in Figure 2, and may contain a teleprotection path and/or an APLC path according to IEC 62488-2. The output pass band signal of the digital PLC modem may be combined in the frequency domain with the output pass band signals of the optional teleprotection and/or APLC paths. The resulting pass band signal is amplified and matched to the coupling device using the power line interface.
For the physical characteristics (voltage, connector form factor, insulation, and pinout) of these interfaces, the relative reference standard shall be applied. An electrical Ethernet interface may optionally provide power over Ethernet of power level 1 or higher, according to IEEE 802.3. 5.2.1.3 Data link layer For this application the link layer should be compliant with the Ethernet standard IEEE 802.3. Normally for practical reasons more than one Ethernet port should be made available to implement switching functionalities for local network connection. Remote Ethernet connectivity may contain an implementation of the basic transparent WAN bridging functionalities, according to IEEE 802.1d.