Advanced Settings 28
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.
Select
Advanced > System Config > Long Distance PoE
, and then select the check box of
the corresponding port to enable long distance PoE.
Click Save
.
Long distance PoE
Figure 3-24
Seldom-used Configurations
3.2
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:
1. Multi-ring networks including crossing ring.
2. Sub-ring switch RAPS packet by virtual channel or non-virtual channel.
3. Forcedly and manually switch blocks.
4.
ERPS reverse switch is configurable.
3.2.1.1 MEP Configuration
MEP (Maintenance Entity Point) is a part of ERPS.