Guralp Systems CD1.1 - Manual (Page 7)

Operator's Guide
The diagram, above, shows a simple configuration using all four
CD1.1 modules. It is necessary to use either the CD1.1
Receiver (data-in-cd11) or the GDI to CD1.1 converter
(gdi2cd11) but not you do not need to use both.
The diagram also shows the subframe database which stores
all subframes passing through. These can then be used to
satisfy back-fill requirements and retransmission requests from
external receivers. This database can be located either in flash
RAM or on a hard drive, depending on considerations of storage
space and power consumption.
The data paths between modules are implemented using POSIX
local IPC sockets.
The following sections provide an introduction to how each
module works. Typical configurations will then be discussed,
followed by a detailed description of each module's
instantiation, configuration and use.
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