Problem Description
The downstream and upload rates on the GPON OLT are poor, and the rate test is unstable.

Problem Analysis
The test speed is about 732 to 927, which is unstable.

Root Cause
The user uses the maximum DBA. The ONT needs to negotiate the bandwidth with the OLT, which occupies some bandwidth. The bandwidth changes and is unstable. When the fixed DBA is used, the bandwidth is fixed and the ONT does not need to negotiate. In this way, the bandwidth is larger and more stable.

Solution Description
We modified the DBA configuration file and the test results were stable between 920 and 930.

Run the following command:
ont-lineprofile gponprofile-id 10
tcont 1 dba-profile-id 4 change 20 to 4

Here are the factory defaults for the DBA profile, and since you want 1G speed, we chose DBA profile 4.

You can also configure a dba-profile with fixed bandwidth:
dba-profile addprofile-id 20 profile-name "down500M" type1 fix 512000

For a fixed bandwidth, you need to know that after a fixed bandwidth is allocated to a user, other users cannot use the bandwidth even if the user does not use the bandwidth. Soit is typically used by users who are very bandwidth-sensitive.