User's Manual Part 2

Tech-X Flex User Guide - Firmware v06.50 Tech-X Flex
®
(NG2)
6-52
Intro
Overview
Wi-Fi
Ethernet
System
IP/Video
MoCA
RF
Specs
Without an active channel guide:
The unit requires you to manually enter the following information for each channel:
• IP Address - IP address of the multicast stream
• IP Port - UDP or TCP port of the stream, with respect to the Encapsulation Method
• Encapsulation Method - Transport encapsulation used for the stream
• Codec - Video codec type
Results - Change Channel
The test reports the channel change time in msec, along with other parameters used in the calculation.
For more information, see How channel change time is calculated on page 6-52.
How channel change time is calculated
During a channel change test, the unit joins the first specified channel, leaves that channel, and then
joins the second specified channel. During this process, four key events are used for the change time
calculation, as illustrated in the following figure:
Figure 6-24 Channel change calculation timeline
Referring to this figure, if no time periods overlap, the basic formula for change time calculation is:
Time = (Last
A
- M
L
) + (First
B
- M
J
)
M
L
Multicast join
request - Ch. A
First packet -
Ch. A
Multicast leave
request - Ch. A
Last packet -
Ch. A
Multicast join
request - Ch. B
First packet -
Ch. B
Last
A
M
J
First
B
Time
Channel A stream Channel B stream
Preliminary issue - Limited distribution only!