Qos Service - Zte zxmsg 5200 Technical Manual

Features
Introduction
QoS Standards
Flow
Classification
Traffic
Monitoring
Limited Port
Rate
EPON features are as follows:
Downlink rate can reach up to 1.25 Gbps. The uplink
transmits data stream in Ethernet packet mode and reaches
up to 1.25 Gbps.
Voice, data and video services.
Operation, maintenance and management functions
A typical EPON system consists of following parts:
OLT (Optical Line Terminal) is located in central office
(CO).
ONU (Optical Network Unit) is located near NIU (network
interface unit) or combined with NIU.
POS (Passive Optical Splitter) is a passive device
connecting OLT and ONU. The function of POS is to
distribute downlink data and collect uplink data.

QoS Service

Quality of Service (QoS) offers network service functions with
different service qualities to meet various demands.
QoS uses following standards:
Flow classification
Traffic monitoring
Limited port rate
Queue
It means to identify packets and transmit them to different
system devices for processing. Traffic identification with different
priority features is based on the Type of Service (ToS) field in IP
packet head. For example, classify packets based on information
of data link layer, network layer, and transmission layer. This
information includes MAC address, IP protocol type, source (host,
network segment) address, destination (host, network segment),
and port number of application program.
Traffic monitoring is used to monitor service flow according to
classification rule at the packets receiving port. It enables
service flow to adapt to the network resource allocated to it,
such as bandwidth. Traffic monitoring is used for rate restriction
on packets receiving port
network. If rate is too fast, traffic monitoring can discard packet
or reset packet priority.
Limited port rate is used to monitor and restrict bandwidth
occupied by service traffic at packet sending port. This technique
enables service flow to adapt to network resource. For example
limited port rate sets a rate threshold at sending port of packet.
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Chapter 3 Service Functions
monitoring traffic flowing to one
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