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800 & 8000 Series - Software Management Guide 134
e. Minimum Reserved Traffic Rate = 2 Mbps
f. Maximum Latency = 20 milliseconds
g. Traffic Priority = 1
Note that two different VoIP Service Flow classes for each direction of traffic have been defined (index numbers 4 to 7) which
follow the ITU-T standard nomenclatures: G.711 refers to a type of audio companding and encoding that produces a 64 Kbps
bitstream, suitable for all types of audio signals. G.729 is appropriate for voice and VoIP applications, but cannot transport
music or fax tones reliably. This type of companding and encoding produces a bitstream between 6.4 and 11.8 Kbps (typically
8 Kbps) according to the quality of voice transport that is desired.
5.6.1.3 QoS Class
A QoS class is defined by a set of parameters that includes the PIRs and SFCs that were previously configured. You can create
up to eight different QoS classes, including five predefined QoS classes. Up to eight SF classes can be associated to each QoS
class, and up to eight PIRs can be associated to each SF class. For example, a QoS class called “G711 VoIP” may include the
following SFCs: “UL-G711 20 ms VoIP rtPS” and “DL-G711 20 ms VoIP rtPS”.
In turn, the SFC named “UL-G711 20 ms VoIP rtPS” may include the following rules: “Cisco VoIP UL” and “Vonage VoIP UL”.
You can create, edit, and delete QoS classes that contain the following parameters:
·
QoS class name
·
Service Flow (SF) class name list per QoS class (up to eight SF classes can be associated to each QoS class)
·
Packet Identification Rule (PIR) list per SF class (up to eight PIRs can be associated to each SF class)
·
Priority per rule which defines the order of execution of PIRs during packet identification process. The PIR priority is a
number in the range 0-255, with priority 255 being executed first, and priority 0 being executed last. The PIR priority
is defined within a QoS class and can be different for the same PIR in some other QoS class. If all PIRs within one QoS
class have the same priority, the order of execution of PIR rules will be defined by the order of definition of SFCs, and
by the order of definition of PIRs in each SFC, within that QoS class.
A good example of this hierarchy is provided by the five predefined QoS classes:
1. Unlimited Best Effort
a. SF class: UL-Unlimited BE
– PIR: All; PIR Priority: 0
b. SF class: DL-Unlimited BE
– PIR: All; PIR Priority: 0
2. L2 Broadcast Best Effort
a. SF class: DL-L2 Broadcast BE
– PIR: L2 Broadcast; PIR Priority: 0
3. G711 VoIP
a. SF class: UL-G711 20 ms VoIP rtPS
– PIR: Vonage VoIP UL; PIR Priority: 1
– PIR: Cisco VoIP UL; PIR Priority: 1
b. SF class: DL-G711 20 ms VoIP rtPS
– PIR: Vonage VoIP DL; PIR Priority: 1
– PIR: Cisco VoIP DL; PIR Priority: 1
4. G729 VoIP
a. SF class: UL-G729 20 ms VoIP rtPS
– PIR: Vonage VoIP UL; PIR Priority: 1
– PIR: Cisco VoIP UL; PIR Priority: 1
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