User's Manual

Advanced Configuration
Tsunami QB-8100 Series (100 Mbps/5 Mbps Models) Installation and Management Guide 73
• Service Flow Direction – Downlink (DL: traffic from End Point A to End Point B); Uplink (UL: traffic from End Point B to
End Point A)
• Maximum sustained data rate (or Maximum Information Rate, MIR) – specified in units of 1 Kbps from 8 Kbps up to
the maximum rate specified in the license.
• Minimum reserved traffic rate (or Committed Information Rate, CIR) – specified in units of 1 Kbps from 0 Kbps up to
the maximum rate specified in the license.
• Maximum Latency – specified in increments of 5 ms steps from a minimum of 5 ms up to a maximum of 100 ms
• Tolerable Jitter – specified in increments of 5 ms steps from a minimum of 0 ms up to the Maximum Latency (in ms)
• Traffic priority – zero (0) to seven (7), 0 being the lowest, 7 being the highest
• Maximum number of data messages in a burst – one (1) to sixteen (16), which affects the percentage of the maximum
throughput of the system
• Entry Status – Enable, Disable, and Delete
NOTE: Note that traffic priority refers to the prioritization of this specific Service Flow.
The device tries to deliver the packets within the specified latency and jitter requirements, relative to the moment of receiving
the packets in the unit. For delay-sensitive traffic, the jitter must be equal to or less than the latency. A packet is buffered until
an interval of time equal to the difference between Latency and Jitter (Latency – Jitter) has elapsed. The device will attempt to
deliver the packet within a time window starting at (Latency – Jitter) until the maximum Latency time is reached. If the SFC’s
scheduling type is real-time polling (RTPS), and the packet is not delivered by that time, it will be discarded. This can lead to
loss of packets without reaching the maximum throughput of the wireless link. For example, when the packets arrive in bursts
on the Ethernet interface and the wireless interface is momentarily maxed out, then the packets at the “end” of the burst
may be timed out before they can be sent.
Users can set up their own traffic characteristics (MIR, CIR, latency, jitter, etc.) per service flow class to meet their unique
requirements. A good example is provided by the 8 predefined SFCs:
1. UL-Unlimited BE
a. Scheduling Type = Best Effort
b. Service Flow Direction = Uplink
c. Entry Status = Enable
d. Maximum Sustained Data Rate = 102400 Mbps e. Traffic Priority = 0
2. DL-Unlimited BE (same as UL-Unlimited BE, except Service Flow Direction = Downlink)
3. DL-L2 Broadcast BE (same as UL-Unlimited BE, except Service Flow Direction = Downlink)
4. UL-G711 20 ms VoIP RTPS
a. Schedule type = RTPS (Real time Polling Service)
b. Service Flow Direction = Uplink
c. Entry Status = Enable
d. Maximum Sustained Data Rate = 88 Kbps
e. Minimum Reserved Traffic Rate = 88 Kbps
f. Maximum Latency = 20 milliseconds g. Traffic Priority = 1
5. DL-G711 20 ms VoIP rtPS (same as UL-G711 20ms VoIP rtPS, except Service Flow Direction = Downlink)
6. UL-G729 20 ms VoIP rtPS (same as UL-G711 20ms VoIP rtPS, except Maximum Sustained Data Rate and Maximum
Reserved Traffic Rate = 64 Kbps)
7. DL-G729 20 ms VoIP rtPS (same as UL-G729 20ms VoIP rtPS, except Service Flow Direction = Downlink)
8. DL-2Mbps Video
a. Schedule type = Real time Polling
b. Service Flow Direction = Downlink