Patent ID: 7064961

Claim:
A communication device for performing communication control, comprising: a detachable card unit for processing signals; a basic unit constituted by a basic board having a common control section packaged thereon, and a basic back wiring board on which are arranged a basic card connector for mounting the card unit and a basic link connector for additionally connecting the card unit and which has wiring formed on a substrate thereof; and an extension unit including an extension back wiring board on which are arranged link connectors detachably connectable to the basic link connector or the link connector of another extension unit, and a card connector for mounting the card unit and which has wiring formed on a substrate thereof, thereby permitting an additional connection for a card unit, wherein said extension back wiring board of said extension unit has wiring configured in a manner such that a first pin blcok of an input side link connector is connected to said card connector of the extension unit, and that a second pin block of said input side link connector, other than the first pin block, is connected to a pin block position shifted by one block of an output side link connector.