Appendix A – Bandwidth Considerations in QSX Overview
The QSX 2.0 offers a number of bandwidth options that allow you to optimize its use for
your particular environment. The flowchart below is designed to serve as a guide for
making the proper bandwidth configurations.
This flowchart assumes that you are starting with an idea of how you want to use the
QSX (e.g.- in a Stand Alone mode to share content with web viewers only or in a mixed
environment with other QSX units and web viewers). It also assumes you have a general
idea of the bandwidth that you have available. Based on that information, you can use
this chart to determine the performance with various numbers of participants and what
settings you need to configure on the Web Admin page of the QSX.
QSX to web-
viewers only
QSX to QSX
& web-
viewers
High Bandwidth
1920 Kbps
Low Bandwidth
384 Kbps
High Bandwidth
1920 Kbps
Low Bandwidth
512 Kbps
# of web viewers 1 5 10
Transition Time (sec) 1-3 3-5 6-8
# of web viewers 1 5 10
Transition Time (sec) 3-7 7-16 7-22
# of web viewers 1 5 10
Transition Time (sec) 1-3 2-6 6-8
# of QSX units 1 2 4
Transition Time (s) 0.25 0.25 0.25
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 1920
Max Average Rx: 1920
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 512
Max Average Rx: 512
Bandwidth Sharing Mode: Time Sharing
Max Average Tx: 384
Max Average Rx: 1024
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 1024
Max Average Rx: 1024
Usage Bandwidth Performance QSX Settings
(Web Admin Page)
# of web viewers 1 5
Transition Time (sec) 3-5 6-15
# of QSX units 1 2 4
Transition Time (s) 0.25 0.25 0.25
How are you
going to use
the QSX?
Med Bandwidth
512 Kbps
# of web viewers 1 5 10
Transition Time (sec) 3-5 7 12
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 512
Max Average Rx: 512
Usage Bandwidth Performance QSX Settings
(Web Admin Page)
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 1024
Max Average Rx: 1024
# of web viewers 1 5 10
Transition Time (sec) 1-3 3-5 6-8
High Bandwidth
1920 Kbps
Note: In the above diagram, “Transition Speed” is the average number of seconds it takes
for a new image to refresh on a meeting participant’s screen. These times are all
approximate. Actual times are based on actual bandwidth and amount of network traffic.
This chart was based on a PC input resolution to the QSX of 1024x768. The QSX was
configured for no scaling (1024x768) for H.323 connections and 800x600 for web
viewers.
>5 web
viewers not
recommended
at this
bandwidth
QSX to web-
viewers only
QSX to QSX
& web-
viewers
Low Bandwidth
384 Kbps
High Bandwidth
1920 Kbps
Low Bandwidth
512 Kbps
# of web viewers 1 5 10
Transition Time (sec) 3-7 7-16 7-22
# of web viewers 1 5 10
Transition Time (sec) 1-3 2-6 6-8
# of QSX units 1 2 4
Transition Time (s) 0.25 0.25 0.25
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 1920
Max Average Rx: 1920
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 512
Max Average Rx: 512
Bandwidth Sharing Mode: Time Sharing
Max Average Tx: 384
Max Average Rx: 1024
# of web viewers 1 5
Transition Time (sec) 3-5 6-15
# of QSX units 1 2 4
Transition Time (s) 0.25 0.25 0.25
Bandwidth Sharing Mode: Bandwidth
Max Average Tx: 512
Max Average Rx: 512
How are you
going to use
the QSX?
# of web viewers 1 5 10
Transition Time (sec) 3-5 7 12
Med Bandwidth
512 Kbps
>5 web
viewers not
recommended
at this
bandwidth
52