Forum IS16/48/80/160 – Photo to follow

Digital exchanges to which both analogue and ISDN lines could be connected, and a mix of analogue and digital IDS handsets. The exchanges had a maximum capacity of between 6 and 24 external lines and between 8 and 124 handsets. Programming could be carried out either via the IDS300 handset or via a computer using software. The connection was made via an RS232 / D-SUB 9 cable.