Grandstream has come a long way from its early days of the BT-101. The GXP21xx series is quite refined in comparison.
The models GXP2130, GXP2140, and GXP2160 are based on the same silicon. All three use the DSP Group DVF9919 CPU, have 256MBytes of DDR3 DRAM, use 128MBytes of NAND flash, and feature the QCA8334 Gigabit Ethernet switch.
However, Grandstream did three largely unique PCB and mechanical designs for each. Seemingly, the equal length traces between the CPU and DDR3 DRAM are the only common elements to all three PCB layouts. Even behind the scenes mundane mechanical components like the gaskets for the speaker enclosure are slightly different!
The GXP2130 design is more elegant and shows more cost-reduction measures than the other models, but those same measures could have been applied to the GXP2140 and GXP2160 without negatively impacting the customer experience.
The biggest take-away for me was to see how cheap Chinese labor and manufacturing has seemingly numbed the designers to manufacturing efficiency. (Or, perhaps each of the three products was designed by different departments?)
The DVF9919 CPU is a more unusual creature. Both members of the DVF99 family use ARM's CoreSight architecture; JTAG-AP provides debug access to each of the ARM926 processors. A decode of the CoreSight ROM tables is provided here.
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