CMS:Main Distribution Frame

The Main Distribution Frame (MDF) is a frame used as a hub for subscriber lines connected to switches as well as subscriber lines connected to telephones on the third floor of the museum. It is used in a similar way as commercial main distribution frames with the main distinction being that the museum's telephones are technically "inside plant."

Connections

Switches

• Step-by-step
• 1XB
• 5XB
• CX 100
• Panel

Phones

The majority of the phones on the 3rd floor are connected to the MDF. Notable exceptions are the three CX 100 phones and the Picturephones.