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specgather.md

@@ -164,6 +164,9 @@ Price idea:
         CSFP-33-A4K1DBT](http://www.deltaww.com/filecenter/Products/download/04/0405/BiDi/CSFP-33-A4K1DBT_S0.pdf)
         (pinout on page 4)
       - Check if use of CSFP would limit the use of standard SFP modules
+      - Actually cannot be used to daisy chain modules: "The compact SFP
+        (GLC-2BX-D) usually uses 1490nm to transmit signal and the
+        1310nm to receive signal".
 
 ### RAM