The YAZ-90-3W is a microprocessor based phone-style intercom system that will support up to 90 stations. Each station can dial a 2-digit number and communicate with other station or initiate a page to a single paging zone. Microprocessor built-in intercom expandable to maximum 90 stations on 4-pair cable. Up to 2.9km wiring distance total. Communication functions: Camp-on busy, secretary transfer, call transfer. Paging or multiple zone paging with optional talk back. Line-off trouble on one channel does not affect the other channels.