Guralp Systems CMG-DCM build <10,000 User Manual
Page 73
Acquisition Modules and Platinum Firmware
Networking Configuration
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Automatically detected and set
•
Restrict speed to 10Mbps. Recommended to save power
•
Fixed 100baseTx, full duplex
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Fixed 100baseTx, half duplex
•
Fixed 10baseTx, full duplex
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Fixed 10baseTx, half duplex
MTU: Allows the Maximum Transfer Unit to be set for the network link.
This parameter controls the maximum packet size used for outgoing network
packets. If any segment of a link between two systems has a restriction on
packet size, larger packets flowing across the link must be fragmented -
broken into smaller parts - and then re-assembled on arrival. This is
inefficient and can badly affect the throughput of a link. In such situations, it
makes sense to restrict the maximum packet size at the sender (to match the
limitation) so that all packets can pass unimpeded.
There is no method to empirically determine the optimum MTU for a given
link from the acquisition module itself but, if the link is to a PC (or, in the
case of, say, a link between two acquisition modules, one end can temporarily
be replaced by a PC) the PC can be used to investigate the link properties and
the correct value can be obtained.
For more information, please see
Note
that, if testing from a PC running Windows, the MTU of the Windows PC
should be set to 1500 before starting the test.
7.1.2.2 DCHP options
Extra dhcpcd arguments: Used to change the operation of the DHCP client.
Please see
for information about what
options can be added here.
7.1.2.3 Static IP (Expert)
Extra ip addr arguments: Used to tune the operation of the network interface.
A non-standard broadcast address can be specified by entering broadcast
broadcast_address. For other settings that can be used here, please see
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Issue E - February 2014