Fast Redundancy loops
In a show situation, a network failure will bring down the show. As all communication from front of
house to the stage runs thru a single network, this becomes a single point of failure. If this link goes
wrong all communication to the stage is gone and there is no show. To solve this a backup loop can
be easily created. In a network situation connecting switches in a loop is “dangerous” to the network,
as packets with go round and round in this loop and there by filling up the complete network bandwidth
with useless data.
The switches need to be setup for this loop to work. A loop programmed on a switch always has 2
ports, the port and a partner. Multiple loops can be created on a switch that work independently. This
loop functions needs to be setup in each switch in the loop. The switches then workout the rest. One
network link will automatically be assigned as a backup and the loops integrity is continually checked.
If a link failure occurs, the backup network link is enabled and a message will be send to the dmXLAN
control software. When the failed network link is back, the backup link is automatically disabled again.
The activation time is 100 milliseconds, compared to office time backup systems like RSTP (rapid
spanning tree protocol) that have a recovery time of almost a minute.
Fiber Optic links
Cat5e cables can be used for Ethernet with 1 Gigabit with no problems, but only up to 100 meters. To
go longer length, fiber optic cables are needed. To connect fiber optic links to the switch8GB, SFP
modules are needed to be plugged into the back of the unit in the Option slots for ports 7 and 8.
Looking from the back the most left slot is for port 7 and the right option slot (next to port 8) is used for
port 8.
The SFP fiber optic modules need to match the fiber cable
used. These modules can be sources from multiple vendors.
The type that can be supplied by ELC lighting is the
TP-SM311LM:
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1.25Gbs
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Max 550 meter
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50/125um or 62.5/125um Multi-Mode
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LC connector
Содержание dmXLAN switch8GB
Страница 1: ...Users manual for dmXLAN switch8GB...
