8-port RS-485 serial interface card kit. Trunking system manages intercommunications between separate intercom systems using intercom ports that have been reserved and interconnected between the intercom systems. Keypanels or other data devices can then communicate with various destinations in other intercom systems via the reserved intercom ports. (This is different from bus expansion, in which the bus systems of two or more frames are interconnected to form one system with decentralized hardware.)
- Trunking system manages intercommunications between separate intercom systems using intercom ports that have been reserved and interconnected between the intercom systems
- Keypanels or other data devices can then communicate with various destinations in other intercom systems via the reserved intercom ports