Motorola APEX1000 Installation And Operation Manual page 274

Item
Overflows
Resets
Buffer Overflow Level
(ms)
Current Buffer Level (ms)
Current Buffer Level
Fullness (%)
Frame Buffer Alarm
Threshold (%)
Actual Input Data Rate
(Mbps)
Maximum Input Data Rate
(Mbps)
Status • Reports
APEX1000 All-Purpose Edge QAM Software Version 2.4.x • Installation and Operation Manual
573408-001-a
Definition
Displays the number of GigE frame buffer overflows recorded for the hour.
The count of overflows is calculated based on the actual input data rate and
the configured buffer level. It is assumed that if the input data rate exceeds
the calculated buffer level, then the input has overflowed one or more GigE
buffers.
The APEX1000 is designed to reset a GigE frame buffer prior to overflowing.
The maximum input data rate and nominal buffer settings are used to
calculate the size of the GigE frame buffers. If an overflow occurs prior to a
reset, then the APEX1000 has been incorrectly configured the (input data
rate setting is incorrect).
Displays the number of frame buffer resets reported by the GigE processor
for the hour. A reset of a buffer indicates that a number of GigE frames have
been dropped, likely resulting in visible tiling or glitching.
Note: Any tiling or glitching should appear only momentarily, as it will take
some time before the GigE buffers become full enough to reset.
Resets of the GigE frame buffers are not normal and indicate the APEX1000
is incorrectly configured and/or the input data rate exceeds the maximum
recommended rate. Additionally, erratic or incorrect PCR values may also
cause resets, due to forcing the APEX1000 to increase the buffer level based
on the incorrect PCR values.
This is the point (in milliseconds) at which the GigE frame buffer will
overflow. This value is based on the number of received frames per second
for all interfaces.
Current highest GigE frame buffer level (in milliseconds).
Current highest GigE frame buffer level as a percentage of Buffer Overflow
Level.
User defined threshold representing a percentage of Buffer Overflow level.
If this threshold is exceeded, a Gigabit Ethernet Frame Buffer Fullness alarm
will be issued.
Gigabit Ethernet MPEG input data rate (in Mbps). This is the total amount of
MPEG data currently being received by all Gigabit Ethernet interfaces.
Maximum Gigabit Ethernet MPEG input data rate (in Mbps). This is the total
amount of MPEG data expected to be received by all Gigabit Ethernet
interfaces. This data rate is used to determine the Reset Buffer Level Limit.
Caution: The default setting of 1.8 Gbps is the maximum recommended data
rate for all GigE inputs. Exceeding this rate may cause the GigE frame
buffers to overflow or reset, resulting in dropped packets (glitching and/or
tiling).
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