- Provides interface for (8) digital stations and (2) analog stations - Also provides interface for: - Music-on-Hold or Background Music source - External paging Zone - Equipped with (4) 8-conductor interface jacks. - (2) for (8) digital stations - (1) for (2) analog stations (or Doorboxes) - (1) for Music-on-Hold/Background Music input and External Paging Zone output and (2) relay circuit connections. - The above relay circuits are available for: - Door-strike control when analog ports are used for Doorboxes - Control for Music-on-Hold or Background Music source - Control of External Paging Equipment - Installs only in universal slots 1-3 of Main or Expansion Chassis. - Allows addition of (1) 3-Port CO Trunk Daughter Board (3COIDB) or (1) PRI Daughter Board (1PRDB). - Maximum (3) per Main or Expansion Chassis. - Maximum (9) per system.