Description: This table is the common thread of all services, regardless of service types, in other words, every service would have an entry in this table.

A service is identified by a tuple of {node, slot, port, channel}. The {slot, port} pair identies the access port of a subscriber. The port can support multiple services, and each such service is identified by a 'service channel'.

To create a service, a row should be created in this table. When the service type is set, a row is automatically 'created' in the appropriate service type specific table. For example, to create an IAS service, one first creates a row in this common table, and then set acServiceType to IAS (which triggers the automatic creation of an entry in the IAS service table), and then set the all necessary parameters.

To remove a service, remove the row in this common table only.