Port (computer networking)

Abstract: A process for fairly allocating resources in a multiport packet switch is disclosed. Each port is connected to a station and comprises a transmit FIFO buffer and a receive FIFO buffer. The ports are connected by a broadcast transmission medium. A transmit buffer of a specific port gains access to the transmission medium when the port possesses a token which is passed from port to port in a round-robin fashion. When a port recognizes that a transmitted packet is addressed to it, the port uses a local processor to determine whether or not to accept the packet. The determination is based on (1) information in the packet header, e.g., priority and address of the transmitting port, (2) the status of the receive buffer (full or not), and (3) other locally recorded information regarding past history of the acceptance or rejection of packets from particular ports and of particular priority classes needed to achieve fairness among packets of the same class and priority among different classes. If the receiving port makes a determination to reject a packet, the receiving port issues a busy signal which is transmitted over the broadcast medium. When the transmitting port receives the busy signal, it aborts transmission of the packet and releases the token. If the receiving port decides to accept the packet, the packet is written into the receive buffer of the receiving port.

Abstract: A centralized queue for a network printing system is provided for allowing clients of a network printer to make job requests and enter a spot in a job queue without transmitting the actual print job data to the network. More particularly, an imaging device protocol (IDP) is provided which operates independently of the network layers below and only requires that a transport protocol/port be bidirectional. A wide variety of heterogenous network protocols may be supported by IDP for placing all of the incoming print job information in a print queue regardless of the protocol. Print job information from both IDP and non-IDP protocol/ports may be placed in the print queue by emulating IDP on the non-IDP protocol/ports. As a result, job information for all of the print jobs attempting to access a busy printer may be stored in the print queue so that the print jobs can be printed by the printer with a fair arbitration once the network printer becomes available.

Abstract: PROBLEM TO BE SOLVED: To allow a WWW server to recognize a telephone number of a user, without attending with telephone number input operation from the user with regard to an on-line shopping system, where on-line advertisements noticed on home pages are referenced so as to make the user to shop. SOLUTION: A WWW server 1 and an exchange 3 are connected one-to-one. The exchange 3 receives lastly a PPP dial from user equipment 2 to know a caller number of the user equipment 2. After 1st information related to the connection of the user equipment 2 to the WWW server 1 converts a number of a transmission port attached to the 1st information into a corresponding line number, and the first information is stored in a storage means 6. Furthermore, 2nd information (caller number), related to the connection of the user equipment obtained by the exchange 3, is stored in the storage means 6 together with the line number. In the storage means 6, the 1st information is coupled with the 2nd information sets via the line number. COPYRIGHT: (C)1998,JPO

Abstract: This paper aims to apply a supply-chain modelling and its analysis framework to the supply chain in the port industry. The simulation approach serves two purposes: to model a supply-chain network in quantity approach and to evaluate its supply-chain performance based on proposed strategies. Through the modelling works to improve the performance, components of simulation model, such as input model, strategy model, operational policy model and performance model, in the port supply chain were identified. The effects of various strategies can guide the way to administrate the supply chain in the different objectives.