If any customer call to you about DES-1024D (H/W : E1) has only 4 PIN (detail on picture) please you explain below reason to customer.
DES-1024D (H/W : E1) is cost down version so it has only 4 PIN however there is no difference in speed in between those two cables. Because in 10/100Mbps, only 4 wires are used (pin 1, 2, 3, 6).