Dynamic Bandwidth Allocation (Dba) - Televes 769501 User Manual

GPON ONT

2.14.3 Dynamic Bandwidth Allocation (DBA)

The DBA (Dynamic Bandwidth Allocation) is available in order to optimize the upstream bandwidth. This mechanism consists in defining an ad-
equate T-CONT to the service traffic in question. There are five types of T-CONT, defined by the Fixed, Assured and Maximum Parameters:
Type 1: Only fixed Bandwidth;
Type 2: Only Assured Bandwidth;
Type 3: Assured+Maximum Bandwidth;
Type 4: Only Maximum Bandwidth (Best Effort);
T-CONT
Fixed BW- R
F
Assured BW- RA
Max Bw - RM
Bandwidth Eligi-
bility
In each GPON interface there are 1024 Alloc-ID (T-CONT identifiers) available, provided to manage ONT services. They are distributed in the fol-
lowing way:
Figure 2-11: Upstream QoS Diagram
Type 5: Fixed+Assured+Maximum Band
Type 1 Type 2
R 0
F1
R
0
A2
R = R R = R
M1 F1 M2 A2
0 0
Table 2-1: T-CONT types definition
Alloc-ID Allocation Type
0-127 Default Alloc-ID (Dynamic or Static)
128-255 Reserved
256-639 Dynamic or Static
640-1023 Static
Table 2-2: Alloc-ID's distribution by T-CONT type
Type 3 Type 4
0 0
R
0
A3
R > R R
M3 A3 M4
Non-Assured Best-Effort
BW - R - R
NA BE
Type 5 Units
R [b/s]
F5
R
[b/s]
A5
R
> [b/s]
M5
R + R
F5 A5
R / R
NA BE
20