– Provides interface for (8) analog stations (not NEC Doorboxes) – Equipped with (4) 8-conductor interface jacks – Installs in any universal slot of Main or Expansion Chassis – Allows addition of (1) 3-Port CO Trunk Daughter Board (3COIDB) or (1) PRI Daughter Board (1PRDB) – Maximum (4) per Main or Expansion Chassis – Maximum (12) per system https://www.nec-enterprise.com/