ZyXEL Communications PLA-470 V2 - V3.0.5 Przewodnik Instalacji Pobierz pdf (Strona 52)

numbers of bits/Hz, and so forth). This QoS management is ensured by using

a quality table for the various links located at the PLC master level.

•

Possibility to create VLAN or slave inter-device links via the centralized

administration of encryption keys at physical and possibly logical levels.

•

Device supervision in order to integrate IP network administration tools

(SNMP stack type) upstream in the PLC network according to a more com-

plete IP network architecture.

•

Management of the redundancy with other master devices.

The master device integrates in this way the entire PLC network intelligence

providing optimized architecture management via embedded or remote interfaces

accessible from standard protocols, generally HTTP or IP, with SNMP stacks per-

manently updated according to the fluctuations of the electrical network.

In the case of PLC networks on domestic LV electrical networks (apartment,

house, SMB, hospital, hotel, school, and so forth), the functionalities expected from

the various master PLC devices (there may be several devices on the electrical net-

work in order to form a distinct logical architecture or to repeat PLC signals) are the

following:

•

Management of the quality levels of the PLC links between the slave devices

and the master device as well as between slave devices.

•

QoS management by means of the useful bandwidth parameters (concerning

the TCP layer), of jitter and latency.

•

Management of secured connections by using encryption keys for each logical

network to ensure the logical isolation of each slave PLC device, for example

in an architecture for a hotel or a university hall of residence. This functional-

ity is used to detect newly plugged in or already plugged in devices.

•

Management of the redundancy between master devices to ensure the correct

operation of the entire PLC architecture with throughputs as high as 200

Mbit/s and still more in the years to come at the physical level.

Table 3.2 summarizes the main functions expected from the master PLC device

and the corresponding technical solutions.

Network Mode Functionality 33

Table 3.2 Functions Expected from the Master Device and Corresponding

Technical Solutions

FUNCTION TECHNICAL SOLUTION

Frame collision CSMA/CA

Time-division multiplexing TDMA

Status table of physical links “Tone Map” table

Synchronization of 50 Hz network

frames

Zero crossing

SNR in each frequency sub-band Listening to noise levels

MAC layer supervision Frames and FEC

Supervision frames Beacon regionalization and beacon mode

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 348 349

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