1 nsp =title NSP The NSP module implements one of the protocols in the Transport layer described by the Digital Network Architecture. The entities that constitute the NSP module are listed below. The indention indicates the hierarchical relationships between the entities. NSP Port Local NSAP Remote NSAP NSP performs the following functions: o Enables the creation and destruction of transport connections used for sending messages within a network node and between network nodes. o Manages the movement of expedited and normal data from transmit buffers to receive buffers, using flow control mechanisms. o Breaks up normal data messages into segments that can be transmitted individually, and reassembles these segments into correct order after they have been received. o Guarantees the delivery of data and control messages to a specified destination using an error correction mechanism. The NSP entity is the top-level entity in the hierarchy of entities belonging to the NSP module. 2 character =title Charateristics Attribute ACKNOWLEDGMENT DELAY TIME Default: 3 Value: 0-65 Maximum amount of time in seconds that an acknowledgment is to be withheld. You cannot modify this characteristic. CONGESTION AVOIDANCE Default: True Value: Boolean Enables the use of the automatic congestion avoidance mechanism. This mechanism reduces the transport window size in response to an indication from the Network layer. DELAY FACTOR Default: 2 Value: 2-15 Factor by which to multiply the current value of the roundtrip delay estimate status attribute in order to set a value for the retransmission timer. NOTE - the roundtrip delay estimate is an attribute of the nsp port entity. DELAY WEIGHT Default: 3 Value: 0-255 Relative weighting to apply to the current estimate and to a new sample when estimating roundtrip delay. DNA VERSION Version number of the DNA NSP architecture specification to which the implementation conforms. You cannot modify this characteristic. KEEPALIVE TIME Default: 60 Value: 1-65535 Time in seconds that NSP waits for data to be transmitted or received before testing a transport connection. When this timer expires, NSP sends a data request PDU to the remote NSP. This PDU does not change the flow control parameters, but does require acknowledgment. MAXIMUM RECEIVE BUFFERS Default: 2000 Value: 1-65535 Maximum number of receive buffers that can store received transport PDUs. You may not decrease the value while NSP is enabled. MAXIMUM REMOTE NSAPS Default: 201 Value: 1-65535 Maximum number of remote NSAPs that can exist concurrently. Must be greater than the current value of maximum transport connections. You can modify this characteristic to a lower value only when the entity is disabled. MAXIMUM TRANSPORT CONNECTIONS Default: 200 Value: 0-65535 Maximum number of active transport connections allowed at one time. Must not be less than the current value of maximum remote NSAPs. You may not decrease the value while NSP is enabled. MAXIMUM WINDOW Default: 8 Value: 1-2047 Maximum credit window that can be granted on a transport connection. This is used for control of the number of data segments PDUs allowed to be transmitted over a particular transport connection before at least one acknowledgment must be returned from the destination system. If the number of PDUs already transmitted equals the maximum window and no corresponding acknowledgments have been received, transport stops sending PDUs over the transport connection and waits for an acknowledgment message. You cannot modify this characteristic. NSAP SELECTOR Default: 32 Value: 0-256 NSAP selector used by the nsp entity when opening a port to a network service. You cannot modify this characteristic. RETRANSMIT THRESHOLD Default: 5 Value: 1-65535 Maximum number of times a source nsp entity is to restart an expired retransmission timer before the remote node is to be considered unreachable. When the threshold is reached, NSP sets the confidence variable to false. 2 status =title Status Attributes CURRENTLY ACTIVE CONNECTIONS Number of active transport connections. STATE Status of the nsp entity. OFF - The nsp entity is disabled. ON - The nsp entity is enabled. 2 local_nsap =title NSP LOCAL NSAP An NSP Local NSAP entity is automatically created for each NSAP address used by the nsp entity. Local NSAPs are used primarily to group together remote NSAPs see the nsp local nsap remote nsap entity. DELETED REMOTE NSAPS Number of times a remote NSAP has been deleted in order to reclaim resources. NSAP ADDRESS Address assigned to the local NSAP when it was created. 2 loc_rmt =title NSP LOCAL NSAP REMOTE NSAP An NSP local NSAP remote NSAP entity maintains the transport counters and generates events resulting from interactions between its superior local NSAP and a remote transport service. The local nsap nsap-address refers to the local NSAP associated with the specified remote NSAP. 3 counter =title Counter Attributes CONNECTS RECEIVED Total number of connect initiated CI messages, regardless of their disposition, that the local service provider has received from the remote service provider. CONNECTS SENT Total number of connect initiate CI messages, sent by the local service provider to the remote service provider, including retransmissions. DUPLICATE PDUS RECEIVED Total number of all types of detected duplicate transport PDUs received from the remote service provider. PDUS RECEIVED Total number of all types of transport PDUs received from the remote service provider excluding detected duplicates. PDUS SENT Total number of all types of transport PDUs sent to the remote service provider excluding retransmissions. REJECTS RECEIVED Number of detected reject received events. REJECTS SENT Number of detected reject sent events. REMOTE PROTOCOL ERRORS Number of detected remote protocol error events. RETRANSMITTED PDUS Total number of all types of retransmitted transport PDUs sent to the remote service provider. TOTAL OCTETS RECEIVED Total number of octets of all types of transport PDUs received from the remote service provider, regardless of their disposition. This count includes detected duplicates. TOTAL OCTETS SENT Total number of octets of all types of transport PDUs sent to the remote service provider, including retransmissions. USER OCTETS RECEIVED Total number of user data octets received from the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include duplicates such as data retransmitted by the remote service provider. USER OCTETS SENT Total number of user data octets sent to the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include data retransmitted by the local service provider. USER PDUS DISCARDED Number of PDUs received from the remote service provider that were discarded because of insufficient buffer space. USER PDUS RECEIVED Total number of transport PDUs containing user data received from the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include duplicates such as transport PDUs retransmitted by the remote service provider. USER PDUS SENT Total number of transport PDUs containing user data sent to the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include retransmitted transport PDUs. 2 port =title NSP PORT An NSP Port entity represents one end of a transport connection and maintains status information about that connection. A port is visible to the network only when it is assigned to a transport connection. 3 counter =title Counter Attributes DUPLICATE PDUS RECEIVED Number of all types of detected duplicate transport PDUs received from the remote service provider. PDUS RECEIVED Number of all types of transport PDUs received from the remote service provider excluding detected duplicates. PDUS SENT Number of all types of transport PDUs sent to the remote service provider excluding retransmissions. RETRANSMITTED PDUS Number of all types of retransmitted transport PDUs sent to the remote service provider. TOTAL OCTETS RECEIVED Number of octets of all types of transport PDUs received from the remote service provider, regardless of their disposition. This count includes detected duplicates. TOTAL OCTETS SENT Number of octets of all types of transport PDUs sent to the remote service provider, including retransmissions. USER OCTETS RECEIVED Number of user data octets received from the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include duplicates such as data retransmitted by the remote service provider. USER OCTETS SENT Number of user data octets sent to the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include data retransmitted by the local service provider. USER PDUS RECEIVED Number of transport PDUs containing user data received from the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include duplicates such as transport PDUs retransmitted by the remote service provider. USER PDUS SENT Number of transport PDUs containing user data sent to the remote service provider, including normal, expedited, connect, accept, and disconnect data. This count does not include retransmitted transport PDUs. 3 status =title Status Attributes CLIENT NAME Name designated by the port user when the port was opened. LOCAL NSAP Local NSAP address being used for the transport connection. LOCAL REFERENCE Unique reference number assigned to the transport connection by the local transport service provider. NETWORK PORT Name of the port being used. REMOTE NSAP Remote NSAP address being used for the transport connection. REMOTE REFERENCE Reference number assigned to the transport connection by the remote transport service provider. ROUNDTRIP DELAY ESTIMATE Amount of time, in milliseconds, of the roundtrip delay on the transport connection. Applicable only when operating class 4 protocol.