QoS Planning Principles

QoS plan for FTTB is in E2E mode, and it can be divided into following policies: traffic
classification, marking, scheduling, traffic monitoring, and DBA policies.

Traffic Monitoring and DBA Policies

T-CONT (used only in GPON networks):Use different T-CONTs for different services.
DBA type: Select a DBA type based on service types. For example, select Type1 for
the management and voice services, and Type3 or Type4 for the Internet access and IPTV services.
DBA bandwidth planning: Configure the DBA bandwidth according to the user's bandwidth
package. The assured bandwidth is the maximum bandwidth required by management packets, VoIP, and IPTV upstream packets. The maximum bandwidth is greater than or equal to the maximum bandwidth that users apply.
Rate limit on ONU uplink port: Set ONU port rate limit or Huawei xDSL line rate limit as required.
Rate limit on ONU downlink port: Set ONU port rate limit or xDSL line rate limit as required.

VoIP service: The upstream bandwidth and the downstream bandwidth of VoIP service are
symmetrical. The actual bandwidth varies with the coding format. This bandwidth is calculated for two POTS ports.

IPTV service (common program): IPTV service mainly occupies the downstream bandwidth. The actual bandwidth depends on the coding format, the picture in picture information, 10% bandwidth burst traffic, and the number of programs that can be concurrently watched by one user (in the case of multi STBs access). The upstream bandwidth is mainly used for transmitting IGMP packets, which
requires little bandwidth and can be neglected.

Rate limit on the BRAS or SR is recommended. Huawei OLT and ONU do not limit rates on
service flows. If the BRAS does not support rate limit, OLTs can limit rates on service
flows using traffic profiles.

l The sum of assured bandwidth of all ONTs under a PON port and the fixed bandwidth of
OMCI management channel must be smaller than Huawei GPON upstream bandwidth. Some
bandwidth must be reserved for future service expansion.