User Manual
6. QoS service configuration
58
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6.
QOS SERVICE CONFIGURATION
QoS:Quality of Service, which means during the network communication process, to allow users to
achieve the desired level of service in terms of bandwidth, delay, jitter and packet loss rate. The
indicators for measuring QoS are as follows:
Bandwidth, theoritical transmission capacity.
Delay, refers to the duration for information sent from one node to another. A big delay
will affect the quality of real-time services such as IP telephony.
Jitter, refer to time-lag variation. Jitter can seriously affect the quality of multimedia
services such as video on demand (VOD).
Packet Loss Rate, the percentage of packet loss during transmission.
QoS implement the function to have packet into the queue and queue scheduling, and the scheduling
mode supports two ways:
Simple scheduling, support uplink/downlink packet scheduling, according to the principle: queue the
incoming message, schedule the outgoing message;
Figure 6-1 Simple scheduling model
For uplink traffic, packets will enter PON port,
According
to
the
outer-VLAN
cos
value
after
the
configuration
of
business
transferring
rules conversion (single VLAN is the VLAN cos, two-layer VLAN is SVLAN cos) to determine
the packet Local Priority (internal priority, default mapping 0-0, ACL rule can be used to
modify the packet Local
Priority);
At
the
entrance
of
PON,
configure
the
mapping
relationship
between
internal
priorities
and uplink out-going
queue;
Configure the sheduling policy at the export of uplink port (including: SP strict priority
scheduling strategy, WRR weighted round robin scheduling strategy, and SP+WRR hybrid
scheduling strategy);
At
uplink
port,
it's
optional
to
configure
the
maximum/minimum
bandwidth
for
each
queue, and the limiting
rate.
The downlink data stream, QTECH OLT provides two scheduling modes: simple scheduling and
hierarchical scheduling mode.
Содержание QSW-9010
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Страница 23: ...User Manual 2 Basic service configuration 23 www qtech ru...
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