Westermo PMI-110-F2G - Manual (Page 8)

Rapid Dual Homing is also the important feature of new generation Ring technology. It supports
ring coupling with other vendors and with easy configuration and multiple redundancies, the
failover time is much faster and the restoration time is zero ms. Uplinks can be auto detected
and gathered into groups. In each group, uplinks are sorted into primary, secondary and
standbys by their link speed. The uplink with the highest speed is more likely to be active path
for data transmission. Link aggregation is also integrated into RDH. An uplink connection can be
a single link or several links aggregated as a trunk, which provides better redundancy and link
capacity.
TrunkRing
TrunkRing is a new feature in MSR which merges the two technologies of RSR and link
aggregation. It takes advantages of aggregation to enhance the link redundancy, while increase
the link speed. The ring will open only if all the aggregated links are broken. Link aggregation
can be achieved by either, static trunk or LACP. Not all the link sections in a TrunkRing need to
be the same. Ring links can be either symmetric or asymmetric. Some are a single path, and the
others are aggregated by links where the number of links in a trunk group can be different.
Users can enhance the link redundancy at different locations in accordance to the need. And
the link with less speed is more likely to be used as the backup path for restoring the network
to full play capacity.
Link Aggregation Control Protocol
Link Aggregation Control Protocol allows you grouping multiple Ethernet ports in parallel to
increase the link bandwidth. The aggregated ports can be viewed as one physical port, so that
the bandwidth is higher than just one single Ethernet port. The member ports of the same
trunk group can balance the loading and backup with each other. The LACP feature is usually
used when you need higher bandwidth for the backbone network. This is a cost‐effective way
for you to transfer much more data.
Multi Powering Mechanism‐ User Manual, Forced and IEEE 802.3at LLDP Power over Ethernet
Some of Legacy PD devices also feature user defined manual mode and forced powering mode
to support non‐standard PD devices without the PoE signature resistor for some WiMax
systems, which are non‐compliant with IEEE 802.3at LLDP Power over Ethernet.
For the new PoE standard – IEEE 802.3at, PMI Switch implements Link Layer Discovery Protocol
(LLDP) into the system for allowing power budget negotiation between PD devices while
providing smart power budget control behavior.
Outstanding Management and Enhanced Security
The PMI‐110‐F2G provides various network control and security features to ensure the reliable
4