1 What does Nickel or Black mean? - This refers to the color of the connector shell.

2 Type of Patch Panel? - Bulkhead patch panels will have HDMI on the front and HDMI on the rear.

3 What does D Series, Keystone and DB9 mean? - This simply refers to the connector mounting holes used in the panel. The D Series type is a 3 hole design and connectors mount to the panel with machine screws. The Keystone type panels have Keystone holes and the connectors snap in. The DB9 type panels have DB9 holes and mount with machine screws.