Guralp Systems CMG-DCM build <10,000 - Manual (Page 136)

Acquisition Modules and Platinum Firmware Receiving Data
These two fields can normally be left blank.
10.3.1.3 Servers
On the “Servers” page, you specify the details of any Scream servers from
which you want to pull data.
Name: A descriptive name for identification purposes.
Hostname: Enter the DNS name or IP address of the desired server.
Service: Enter the UDP/TCP port number on which the server is listening for
data requests. Port numbers can be mapped to names using the standard
Linux /etc/services file, which can be edited from the command line.
Type: Select whether you wish to use UDP packets or TCP connections. With
UDP packets, the GCF protocol keeps track of which packets have been
received and automatically requests retransmission of any missing data. TCP,
on the other hand, is a connection-orientated protocol which handles packet
sequencing and retransmission itself (at the cost of a little extra network
overhead).
MAN-EAM-0003 136 Issue E - February 2014