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̈ Chapter 9: Quality of Service LANCOM Reference Manual LCOS 3.50
173
Quality of Service
As long as the interval for the minimum bandwidth is not exceeded (i.e.
up to the end of the current second), all packets in this queue are treated
without further special priority. All packets of this queue, of the "secured
queue" and the "standard queue" share now the existing bandwidth. The
packets are taken in order from the queues when sending in exactly the
same sequence, in which they have been placed into these queues. If the
interval runs off, all blocks, which are at this time still in the "Urgent queue
II" up to the exceeding of the in each case assigned minimum bandwidth,
are placed again into the "Urgent queue I". The rest remains in the
"Urgent queue II".
With this procedure it is guaranteed that prioritized connections do not
crush the remaining data traffic.
̈ Secured queue
This queue does not have a separate priority. However, packets in this
queue are never dropped (transmission guaranteed).
୴ Packets with ToS “High Reliability“
୴ Packets with DiffServ “Assured Forwarding“
̈ Standard queue
The standard queue contains all not classified data traffic. Packets in this
queue are dropped at first when packets cannot be delivered fast enough.
The queue concept can, however, only work out when a “traffic congestion“
of data packets has been accumulated at the interface from LAN to the WAN.
Such a congestion is created when the interface within the LANCOM can sub-
mit fewer data to the WAN than data are delivered in peak periods from the
LAN. This is e.g. the case, if the interface to the WAN is an integrated ADSL
interface with comparatively low transmission speed (“upstream”). The inte-
grated ADSL modem automatically reports back to the LANCOM how many