Orban opticodec 7200, Handbook

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To ensure the most secure transfer possible, the maximum
value (bar all the way to the right) should be set; however,
this results in a longer delay.
If more value is placed on having a shorter delay, then the
bar can be moved to the left; however, this has a negative
impact on the transmission security.
To permit the best possible transmission security with a
short delay, you should ensure that no additional devices/
workstations apart from the OPTICODEC are transmitting
data over the network.
Not all applications have equal status for data transfers, and
not all applications require the same high standards for data
transfers. To minimise or prevent the risk of bottlenecks
in data networks, the IP header implements the so-called
'Quality of Service (QoS)‘ in addition to the identifier fields
such as time to live, protocol and header checksum.
If the router is configured accordingly, QoS actively regu-
lates the load status on the network and uses the available
bandwidth intelligently and effectively on the basis of data
prioritisation or bandwidth reservation.
TOS (Type of Service) or DiffServ (Differentiated Service
Architecture) are the key mechanisms of QoS and are
responsible for the assessment of packet priority.
The TOS bits contain information on the ways and means
of how a datagramm should be handled by a router. An
overloaded router can, for example, on the basis of the
TOS field determine which packets are less important
(and can therefore be cancelled) and which packets must
essentially be forwarded.
Quality of Service
Type
TOS
Precedence Values
Precedence Significance Precedence Significance
000 Normal 011 Flash
010 Priority 100 Flash Override
010 Immediate 101 Critical