Preventive Maintenance and Fault-finding
Page 6-10
Instruction Manual: evolution 5000 E5710 and E5720 Encoder
ST.TM.E10074.1
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
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 either the front panel or by the
MEM.
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
The E5710/E5720 Encoders, when running in 4:2:2
1
mode, have two
software selectable rate buffer modes; small and medium.
When transmitting 4:2:2
1
mode into systems using the earlier System
3000 PRO IRD M2/PSR/3/422BAS then the rate buffer mode of the
Encoder must be set to 'small'.
However, when operating into an Alteia the rate buffer mode of the
Encoder must be set to ‘medium’ (default size).
When operating in mixed environments, both the Alteia and the Encoder
must be changed to small buffer mode.
NOTE…
Contact Customer Services for advice about changing the settings (see Preliminary Pages).
1
4:2:2 is only available when software option M2/ESO2/422 is purchased.
