Satchwell BAS 2800+ Network Interface Unit (NIU) for creating a backbone LAN for the Satchwell BAS 2800+ System, could also be used to connect a modem to the Satchwell BAS System for remote access or for dialling out alarms to a central bureau computer, the old style NIU's are ideal for adding to your existing BAS 2800+ System which already incorporates the old style NIU's.