CM-140GE / -RA/-UV / CB-140GE / -RA
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8.3.2 Video data rate (network bandwidth)
The video bit rate for CM-140GE/CM-140GE-RA and CB-140GE/CB-140GE-RA is:
In case of using Jumbo Frames, the packet data will be improved 2%.
For CM-140GE/-RA/-UV and CB-140GE/-RA, the jumbo frame can be set at maximum 4040 Bytes
(Factory setting for packet size is 1428 Bytes). To set Jumbo Frame, refer chapter 8.2.4.
8.3.3 Note for setting packet size
The packet size is set to 1428 as the factory default. Users may enter any value for the
packet size and the value will be internally adjusted to an appropriate, legal value that
complies with the GenICam standard. The packet size can be modified in the GigE Vision
Transport Layer Control section of the camera control tool.
Regarding data transfer rate, a larger packet size produces a slightly lower data transfer
rate. The CM-140GE and CB-140GE sereis can support a maximum of 4040 byte packets
provided the NIC being used has a Jumbo Frames function with a setting of a 4040 bytes or
larger.
Caution: Do not set the packet size larger than the maximum setting available in
the NIC or switch to which the camera is connected . Doing so will cause
output to be blocked.
8.3.4 Calculation of Data Transfer Rate
In order to calculate the data transfer rate, the following parameters and formula are
required.
Setting parameter
Item
Unit
Symbol
Image Width
[pixels]
A
Image Height
[pixels]
B
Bits per Pixel
[bits]
C
Frame Rate
[fps]
D
Packet Size
[Bytes]
E
Number of Packets (including Data Leader & Trailer
Packet)
[packets]
G
Data Transfer Rate
[Mbit/s]
J
Fixed value
Item
Unit
value
Data Leader Packet Size
[Bytes]
90
Data Trailer Packet Size
[Bytes]
64
Model
Pixel Type
Packet data volume
(In case the Packet size is 1500)
CM-140GE/-RA
MONO8
372Mbit/s
MONO10_PACKED
559Mbit/s
MONO10
745Mbit/s
CB-140GE/-RA
BAYRG8,BAYGB8
372Mbit/s
BAYRG10,BAYBG10
745Mbit/s
CM-140GE-UV
MONO8
194Mbit/s
MONO10_PACKED
291Mbit/s
MONO10
388Mbit/s