The difference is shielding.
TM21 series is shielding type and TM22 series is non-shielding type. Both series satisfy TIA/EIA-568-B enhanced category 5. However, applicable...
The difference is contact plating.
ER8-***P-0.8SV-2H :0.76μm gold over 2.54μm nickel Thick plating is required for communication market. (Bellcore specification)
...
The hole size is reduced to stabilize the connector to PCB and prevent connector
from mis-position and rotation during mounting process.
Please refer to FX18 Design Guide Line,...
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