CPI2-GBSB-14/20 - signal splitter board
This board is used in a combination with CPI2-GDMR relay demultiplexers, only. A CPI2-GDMR unit has a pair of output connectors: TARGET 1 and TARGET 2 toggling by the ATE signal. So, the ISP signals split in two groups of 20-pin connectors – seven connectors in each group: 1 and 2.
If the demultiplexer connects to the B channel, the CPI2-GBSB-14/20 splitter board should be used. See the datasheet.