ZyXEL Communications PLA-470 V2 - V3.0.5 Installationsanleitung PDF herunterladen (Seite 54)

100

101

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Selection of the best suited modulation mode and FEC (forward error correc-

tion) type in view of the PLC link qualities. In the case of HomePlug 1.0, the

four possible modes are DQPSK ¾ (differential quadrature phase shift key-

ing), DQPSK ½, DBPSK ½ (differential binary PSK), and ROBO (robust

OFDM), which are used to obtain four types of data rates.

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Priority of each network PLC device. This parameter is indicated in the

VLAN field of the Ethernet frames for each PLC device according to its con-

figuration. It is used to establish almost a network hierarchy with devices act-

ing as gateways to other networks and other devices playing standard roles in

the architecture.

Figure 3.2 illustrates the architecture of a PLC network in the peer-to-peer

mode, in which these four parameters are permanently exchanged by the network

devices in order to keep the network homogeneous and to maintain a better

Ethernet frame and bandwidth routing distribution.

Network Mode Functionality 35

PRIORITYPRIORITYPRIORITYPRIORITY

PRIORITY

Figure 3.2 Parameter exchange between PLC network devices in the peer-to-peer mode

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ZyXEL Communications PLA-470 V2 - V3.0.5 Installationsanleitung Seite 54

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