FABR Administrative State and Operational Status

The FABR Administrative State (or Admin State) indicates the state that the operator desires the FABR application to be in, and can be manually enabled or disabled. The Operational Status indicates the actual status of the FABR application. The FABR Admin State and Operational Status is updated when the application is started or restarted and when FABR congestion is detected.

Next Generation Network Priority Service (NGN-PS) allows National Security/Emergency Preparedness (NS/EP) users to make priority calls/sessions using public networks. The NGN-PS requests are never discarded due to congestion. NGN-PS requests are always processed by FABR application unless FABR application or DP is unavailable, in that case configured Exception Action is used for further routing. For a detailed description of NGN-PS, refer to the Diameter User's Guide and Help.

Table 5-1 lists the FABR Admin State and Operational Status related to the DP pool operational status and to FABR congestion levels. It specifies the actions that FABR takes in various situations.

Table 5-1 FABR Admin State and Operational Status

FABR Admin State	DP Operational Status/Congestion Level	FABR Congestion Level	FABR Operational Status	FABR Actions or Impacts on FABR
Disabled	Any	Any	Unavailable	The default shutdown state
Enabled	DP Operational Status = Normal or Degraded DP Congestion Level = Normal OR Minor	Normal/​CL1/CL2	Available	FABR receives requests from the DRL. FABR sends queries to the DP.
	DP Operational Status = Normal OR Degraded DP Congestion Level = Major OR Critical OR DP Congestion Abatement in progress	Normal/​CL1/CL2	Available	FABR receives requests from the DRL. FABR applies DP Congestion routing exception action.
	DP Operational Status = Normal OR Degraded DP Congestion Level = Any	CL3	Degraded	The DRL stops sending non-NGN-PS requests to FABR. DRL only sends NGN-PS requests to FABR.
	DP Operational Status = Down DP Congestion Level = Any	Any	Unavailable	FABR is shutting down. DRL stops sending requests to FABR.