HELP ON CONNECTING MY DVR TO MY SECURITY CAMERAS!!

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HELP ON CONNECTING MY DVR TO MY SECURITY CAMERAS!!

CAN SOMEONE PLEASE TELL ME HOW AND IF I CAN USE A HD DVR RECEIVER TO RECORD MY SECURITY CAMERAS.IT IS A HR-10-250 FROM DIRECT TV.I OUT RIGHT OWN IT.BUT IS NOT IN SERVICE.IS IT POSSIBLE TO HOOK IT UP THROUGH MY QUAD SPLITTER.THANK YOU VERY MUCH FOR ANY ANSWERS.