ClearOne StreamNet Infrastructure and Network - Manual (Page 11)

Chapter 1: StreamNet Networking 8
IgmP
igmP is a multicast group discovery protocol that is used between the clients and the local multi-
cast router.
Multicast enables efficient use of network bandwidth, as each multicast datagram needs to be
transmitted only once on each network link, regardless of the number of destination hosts.
Hosts must have a way to identify their interest in joining any particular multicast group, and routers
must have a way to collect and maintain group memberships: these functions are handled by the
IGMP protocol in IPv4. In IPv6, multicast routers use the Multicast Listener Discover (MLD) protocol
to maintain group membership information.
Multicast routers must also be able to create a multicast distribution tree that enables forwarding of
Multicast Datagrams only on the links that are required to reach a destination group member.
Pim-Sm, Pim-dm, and dVmrP are multicast routing protocols that are used across different
subnets, usually between the local multicast router and remote multicast router.
PIM Protocol Independent Multicast (PIM) is a standard multicast routing protocol that provides
scalable inter-domain multicast routing across the Internet, independent of the mechanisms pro-
vided by any particular Unicast routing protocol.
PIM has two types: PIM-Dense Mode (PIM-DM) and PIM-Sparse Mode (PIM-SM)
P
o
e P
ower over
e
therNet
(dc
to
dc
INjectIoN
)
Power over Ethernet (PoE) is a technology that passes electrical power with the data on standard
Ethernet cabling. Many StreamNet devices can utilize simple PoE injectors that will allow users to
install devices with only a standard cat5 UTP cable. This is useful if the device has been installed
in a location without any additional wire or without any access to local AC electrical service.
The way this works is you connect one power injector at the head-end close to the switch location.
You connect one cat5 from the switch to the injector and then a second cat5 that would be used to
connect the injector located by the switch with the injector at the far end of the cable located by the
StreamNet device. Next you connect a power supply to the injector installed at the switch location.
Finally you would connect another injector to the cat5 at the far end of the cable by the StreamNet
device, and connect the power output to the StreamNet power input connection.
The following is a list of Current StreamNet devices that are PoE injector compatible: