DIRECTV Receiver DECA Ethernet to Coax Adapter (DCA2SR0) Generation II - Black DECA system is used in conjunction with the SWM LNB, SWM8 or SWM16 to give receivers internet access through the coax coming from the SWM Switch The DECA network is a shared 200Mb/s, or the same speed as full duplex 100Mb/s Ethernet Multi-Room Viewing Feature requires a SWM system, and compatible DIRECTV receiver. Every receiver requires a DECA or Band Stop filter except H24, H25, HR24, and HR34. HR20-100 receiver requires a Band Stop Filter for this system to work Using a DECA prevents the diplexing of an off-air antenna, because they both use the same frequency