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EchoLife HG612 FTTC VDSL NTE
User Guide
5 Parameter Settings
Issue 01 (2009-05-15)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd
5-3
Parameter Description
Service type It specifies the traffic management type used for the PVC.
z
UBR Without PCR: The ATM network makes the best efforts
to transmit UBR user information. This is called best-effort
transmission. The transmission quality, such as cell loss,
transmission delay, and jitter, cannot be guaranteed. This type of
service is applicable when an end-to-end error tolerance
mechanism or protocol is designed in the higher layer and the
applications do not impose stringent requirements on network
transmission capability.
z
CBR: A fixed bandwidth (or rate) is required. This type of
service is applicable to real-time audio and video signal
transmission.
z
Realtime VBR: Stringent requirements are imposed on
transmission delay. This type of service is mainly used for
services with stringent requirements on real-time performance,
such as video monitoring and compressed voice
communications.
z
Non Realtime VBR: This type of service does not impose
stringent requirements on transmission delay. For example, a
transmission delay of multiple seconds does not affect the image
quality when a user retrieves the image coded with MPEG-2
from the video server through the ATM network. The
transmission rate between the user and the network, such as the
PCR and the SCR, however, needs to be specified to reduce the
cell loss probability.
Submit To save the settings, click this button.