The WorkGroup table contains a row for each workgroup that exists on a unit up to a maximum of 16. Ports can be assigned to active workgroups. A new workgroup can be created by writing either createAndGo(4) or createAndWait(5) to this object for an instance which does not already exist. (The workgroup may also be created by setting the downlink unit and/or port). Provided the index value is in the range 1 to 16 inclusive, a new workgroup will be created with that number, and default values of downlink unit and port. If the row is created by writing createAndGo(5), the status of the new workgroup becomes active(1) immediately, otherwise it becomes notReady(3), and subsequent reads of this object will return that value. Only if the status of the row is notInService(2) or notReady(3) will sets of the downlink unit or port be successful. Changes will not take effect until active(1) is next written to the rowStatus. Thus, to amend the downlink for a workgroup the network manager must first set rowStatus to notInService(2), set the new values for the downlink, then set rowStatus back to active(1). This will fail if the specified port is not assigned to the workgroup. A workgroup may be deleted by setting its row status to destroy(6). This will be rejected if the workgroup has any ports assigned to it and its rowStatus is other than notReady(3).