Preventive Maintenance and Fault-finding
Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder
Page 6-9
ST.RE.E10137.3
6.5.4 Video
Fault-finding
Fault Symptoms
Table 6.1: Video Fault-finding
Problem
What to do
Video input lock error
Check video input.
Video - wrong line standard
Check which video format is selected.
VCM stopped
Reboot.
Bad parameters
Check set-up.
Breaks in Transmission
If a transitory break in transmission occurs then check the encoding mode
option of the Encoder (see Chapter 4, Operating the Equipment Locally).
In the standard delay, low delay, very low delay and mega low delay the
following are not seamless: encoding modes, bit-rate and GOP changes.
This is because the Encoder tries to maintain minimal end-to-end delay
(latency) and that means buffer sizes must be as small as possible. In the
standard delay, low delay, very low delay and mega low delay encoding
modes the buffer size is selected by the video bit-rate. Changing the
bit-rate changes the buffer size, requiring a reset of the coding process.
For reflex operation video bit-rate changes must be seamless as the
bit-rate varies continuously. All the seamless modes are seamless only for
video bit-rate changes. However, for some GOP changes operation can be
seamless, but this aspect is not guaranteed.
Noise Reduction
1
Where incoming picture material is corrupted by high frequency noise
(such as white noise) it is advisable to make use of the noise reduction
process. Noise reduction can be selected at the front panel.
6.5.5 Audio
Fault-finding
If having problems when using the Dolby E Pass-through coding mode then
refer to Annex G, Audio Modes, for information about using this mode.
6.5.6 Mux
Fault-finding
If there is no output from the ASI connectors, check the following:
1. The bit-rate - if it is too low then the video etc. is automatically
switched off.
2. The packet length - should be 188 or 204 bytes depending upon
configuration.
6.6
Rate Buffer Setting (SD Only)
The Encoder, when running in 4:2:2
2
mode, has two software selectable
rate buffer modes; small and medium.
1
Licence M2/ESO2/NR or M2/ESO2/HDNR is needed for this feature.
2
4:2:2 is only available when software option M2/ESO2/422 is purchased.