EMA C++ RDM Usage Guide : 4 Source Directory Domain : 4.4 Special Semantics : 4.4.3 ServiceState and AcceptingRequests
 
4.4.3 ServiceState and AcceptingRequests
The ServiceState and AcceptingRequests elements in the State filter entry work together to indicate the ability of a particular service to provide data:
ServiceState indicates whether the source of the data is accepting requests.
AcceptingRequests indicates whether the immediate upstream provider (the provider to which the consumer is directly connected) can accept new requests. If False, new requests are rejected while existing streams remain unaffected (reissue requests can still be made for any item streams that are currently open to the provider).
The values of ServiceState and AcceptingRequests do not affect existing streams and do not imply anything about the data quality of existing streams.
 
Table 32: ServiceState and AcceptingRequests  
SERVICESTATE
ACCEPTINGREQUESTS
MEANING
Up(1)
Yes (1)
New requests and reissue requests can be successfully processed.
Up(1)
No (0)
Although the source of data is available, the immediate provider is not accepting new requests. However, reissue requests on already open streams can be processed.
Down (0)
Yes (1)
The source of data is not available. The immediate provider, however, can accept the request and forward it when the source becomes available.
Down (0)
No (0)
Neither the source nor the immediate provider is accepting new requests.