Long Distance Poe; Seldom-Used Configurations; Erps - Dahua DH-PFS4212-8GT-96 Web Operation Manual

3.1.7 Long Distance PoE

After you enable long distance PoE, the maximum transmission distance will change from 100 m to
250 m, and the transmission speed will be reduced from 1 Gbps to 10 Mbps.
Non-PoE Ethernet switches do not support this function.
Select Advanced > System Config > Long Distance PoE, and then select the check box of the
corresponding port to enable long distance PoE. Click Save.
3.2

Seldom-used Configurations

3.2.1 ERPS

ERPS (Ethernet Ring Protection Switching) is the loop prevention protocol standard of layer 2 defined
by ITU-T, and the standard number is ITU-T G.8032/Y1344. So it is also called G.8032. It defines RAPS
(Ring Auto Protection Switching) protocol packet and protection switching scheme.
ERPS supports two versions (V1 and V2). V1 was released by ITU-T in June 2008, and V2 was released
by ITU-T in August 2010. V2 is compatible with V1, and adds the following functions:
Multi-ring networks including crossing ring.

Sub-ring switch RAPS packet by virtual channel or non-virtual channel.

Forcedly and manually switch blocks.

ERPS reverse switch is configurable.

Only some models of switches support ERPS.
Figure 3-24 Long distance PoE
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