Description: Parameter specifying the different DPNSS Signaling channel states.

The maintenance states - bsy, inb and offline does not directly correspond to a DLC state in the DLC table. In this state the DLCs state should be either one of oos or resetAttempt.

oos - Out Of Service This State can be entered immediately following power up or due to a maintenance action, eg following reset failure. It is the state in which all DLCs exist before activation of the Data Link Layer. A DLC remains in the 'Out of Service' state if it is not being used across a particular physical link. In this state all received frames are ignored. The oos status in the dpnssSigTable indicates that all the corresponding DLCs are in oos state.

idle This is the state which a DLC enters from the OOS state while awaiting to be started. In this state reset requests from the remote PBX are not ignored, as in the Out of service state. If a DLC is reset remotely the local data link layer does not need to reset it. When a DLC is started up locally it moves from this state to Reset Attempted. The idle status in the dpnssSigTable indicates that all the corresponding DLCs are idle state.

resetAttempted This is the state which a DLC enters when a reset request is sent on it. The DLC enters the Reset Complete state on completion of the reset procedure. The resetAttempted status in the dpnssSigTable indicates that all the corresponding DLCs are in resetAttempted state.

resetComplete This is the state of a DLC which has just been successfuly reset. In this state, all the state variables are set to 0. The resetComplete status in the dpnssSigTable indicates that all the corresponding DLCs are in resetComplete state

overload This indicates that a DLC is not able to process the L2 messages due to various overload reasons which can result for example when the layer 2 peer DLC is sending

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messages at a rate faster than the what the near-end can handle. The overload status in the dpnssSigTable indicates that all the corresponding DLCs are in overload state.

recvOverrun - receive overrun This indicates that the DLC is receiving layer 2 messages from a peer at a rate faster than it can buffer/process. The recvOverrun status in the dpnssSigTable indicates that all the corresponding DLCs are in recvOverrun state.

babbling This indicates the receipt of an unexpected 'glitch- message' on all the DLCs.

crptMsg - corrupt message This indicates the receipt of a corrupt (but correctly framed) DPNSS Layer 2 message on all the DLCs catered by this DPNSS signaling channel.

The states - oos, idle, resetAttempted, resetComplete, infoTransfer and overload of this table is applicable to all the DLCs & reflects the status of all the DLCs. This value should match the corresponding OperStatus of the DLC Table. This option is provided so that the implentors have the flexibility of setting/reading the states of all DLCs in one shot rather than walking through all the entries of the DLC table.

bsy - busy Indicates a maintenance operation status of the signaling channel during which this link will not be used for signaling. Generally this is the value during some maintenance actions on the DPNSS link.

inB - installation Busy Indicates a maintenance operation of the signaling channel during which, apart from this channel not being available for signaling, the configuration parameters (mostly ds0 characteristics of this interface) can be changed. The implementor may chose to just use the bsy state as a superset state instead of inB in which case this state will be rendered redundant.

offLine - Indicates a maintenance operation of this signaling channel during which, apart from this channel not being available for call processing, the dpnss link interface configuration parameters also cannot be changed. This state is used to completely delete this

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interface and configure it as some interface or re- configure this interface. The vendor may just chose to just use the inB state as a superset state instead of offline in which case this state will be rendered redundant.

pInSv - Partial Inservice This indicates that some DLCs (atleast 1 DLC) are

in Reset Complete, Information Transfer or Idle state.

pOverload - Partial Overload This indicates that some DLCs (atleast 1 DLC) is in overload state.