Applied Mathematicsematics

Download Big-Bang ERP Implementation at a Global Company by Navah Pliskin, Marta Zarotski PDF

By Navah Pliskin, Marta Zarotski

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These two concerns should be treated in more depth. , collisions) by two or more sources sharing the same frequency band. Collisions are typically the result of multiple stations waiting for the channel to become idle and then beginning transmission at the same time. Collisions are also caused by the “hidden terminal,” problem, where a station, believing the channel to be idle, begins transmission without successfully detecting the presence of a transmission already in progress. Interference is also caused by multipath fading, which is characterized by random amplitude and phase fluctuations at the receiver.

During a session, the client issues a sequence of request packets, each of which is immediately followed by a response from the provider. Unrequested responses are not—today—supported by IrLAN. 5 IrLAN Command Description Command Code Description Get Provider Information Used by the client to determine the media type/data frame formats supported by the provider and the IrLAN modes supported by the provider (access point, peer-to-peer, and/or hosted) Get Media Characteristics Used by the client to get detailed information on the media types supported by the provider Open Data Channel Used by the client to get an IrLMP LSAP number on which it should establish a TinyTP connection to the provider for the data channel Close Data Channel When the provider receives this command, it will stop sending packets to the data channel and stop sending received packets on the LAN; it is still up to the client to close the TinyTP connection Reconnect Data Channel Used by the client to reconnect a data channel; if the reconnection is successful (the provider returns a status code of zero), the state of the data channel is the same as when the channel was disconnected Filter Configuration Used by the client to control the filtering of packets from the provider to the client; this command also allows the client to check the filter configuration on the provider; packet filtering allows a network client to set up a description of the type of packets that the client wants to receive from the network The IrDA Standard 43 packets available to the IrLAN client and the response packets returned by the provider.

This connection can be in a sniff mode (special low power connect procedure) or not. ω Sniffing is used to initiate or cancel the sniff mode. The IrDA Standard 25 ω Data services can either be sent as sequenced or unsequenced data. No confirmation is returned to the sender (even for sequenced data). ω Status is used by IrLAP to inform the upper layer that the quality of the link is suspect. Either the link is experiencing high levels of noise or all connection activity has ceased. If the link quality does not improve, then IrLAP disconnects automatically.

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