Edit->Service->General->Tx Qos Screen - Teledyne QMultiFlex-400 Installation And Operating Handbook

QMultiFlex-400™ Installation and Operating Handbook
6.2.5
Edit->Service->General->Tx QoS Screen
The Edit->Service->General->Tx QoS screen is shown in Figure 6-12.
Figure 6-12 Edit->Service->General->Tx QoS Screen
Traffic shaping allows the bandwidth in the shared outbound carrier from the hub to be
allocated according to the needs of the remote sites. It can be used to guarantee the level
of bandwidth and also allows any excess remaining bandwidth to be shared in a defined
way. When traffic shaping is disabled, the outbound bandwidth is allocated on a first-come-
first-served basis.
Traffic shaping works by recognising markings (such as VLAN IDs) in the terrestrial packets
coming into the QMultiFlex-400™ for transmission. The markings may be in the Ethernet
frame or the IP header and therefore both Layer 2 and Layer 3 traffic shaping is supported.
The outbound carrier can be defined by a single MODCOD that all the remote sites receive.
Alternatively, the outbound carrier can consist of multiple MODCODs, where the packets
for a particular remote are all transmitted using the same MODCOD. The use of a single
MODCOD is referred to as 'single stream' mode, whereas the use of multiple MODCODs
is referred to as 'multiple stream' mode. Traffic shaping can be used in both cases but
varies in how it is applied.
There is no change to the overall symbol rate or power when the outbound carrier is
transmitted using several different MODCODs.
When the shared outbound is represented by a single stream (i.e. a single MODCOD) then
the QoS classification methods used in traffic shaping are VLAN IDs, IP addresses, Diffserv
and IEEE 802.1p priority tags.
QoS Traffic Shaping Overview
Please see
including definitions of terms and worked examples.
Section 8.7.8 for an overview of how traffic shaping works
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