26
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
.
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:
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.