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  • 权利要求
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    • 专利摘要:

    公开号:SE0900539A1
    申请号:SE0900539
    申请日:2009-04-22
    公开日:2010-10-23
    发明作者:Dan Sahlin
    申请人:Raycore Fiber Optic Solutions Ab；
    IPC主号:
    专利说明:

    Patent application no. 0900539-8 The method is compatible with older equipment that cannot handle automatic negotiation. For newer equipment that supports the method, it is guaranteed that the best compatible setting for both sides is obtained.
    The invention learns particularly well for Ethernet via optical fiber, where optimal settings will be obtained.
    There is no prior art method for negotiating the best compatible point-to-point connections, which is compatible with older equipment and which also copes with weaknesses of the medium itself.
    Summary of the Invention In point-to-point communication equipment, each endpoint has a communication node that needs to have settings relative to the other node that are both compatible and optimal. This proposed invention finds such an attitude, even when the communication takes place towards an older node, which cannot handle any negotiation, and nodes which implement the invention.
    Compatibility with older equipment, which does not support any automatic negotiation methods, is achieved by letting the node first test all settings, one at a time.
    Each node normally sends a signal (link signal) that corresponds to the current settings.
    The second node will then only detect this link signal if it has the same settings.
    Brief Description of the Drawings Fig. 1 shows the flow chart for the synchronization phase and the optimization phase. Fig. 2 shows that it is guaranteed that two nodes always find a common overlap when they are in main mode S1.
    Detailed description of the drawings To find both compatible and optimal settings, two phases are used: synchronization and optimization, as shown in Pig. 1.
    In the synchronization phase, it is assumed that there is always a common main setting for both nodes. The nodes cycle through all settings sequentially to be able to find a common compatible setting, but to be able to guarantee this, both nodes must stay much longer on the main mode settings.
    Let S1 be the common main setting, and the other settings be S1 to Sn, where n is the number of settings. Let M be the minimum time required to establish a connection given that both nodes have the same settings. M should also be long enough to detect if the medium itself has any problems communicating at this speed.
    Each node cycles through all operational settings, and remains at settings S2 to Sn for M seconds each. This takes a total of (n-1) * M seconds. But the node stays at S1 for at least (n-1) * M + 2M seconds.
    Fig. 2 shows a worst case where two nodes have been started at different times but still have setting S1 at the same time for at least 2M seconds. As the drawing shows, these 2M seconds can be split, but it is still guaranteed that they spend at least M seconds consecutively in time, which is enough to establish a connection.
    The synchronization phase may alternatively end with the two nodes establishing a connection with one of the settings S2 to Sn. sm) Patent application no. 0900539-8 Thus, the synchronization phase will always end with a compatible setting, as shown in the flow chart in Fig. 1. Note that the synchronization phase will also find a compatible setting for older nodes that do not change their settings at all.
    The next phase, the optimization phase, begins as soon as the synchronization phase has reached a common setting, see Fig. 1. This will ensure that both nodes are in the same place in their cycles. In the optimization phase, the nodes go through all operational settings again, but this time sorted from best to worst. In Fig. 1, these settings have now been renamed to S'1 to S'n, where S'1 is the best setting and S'n the worst. This will ensure that the first mode found is the best common setting.
    If a link signal is no longer received, a node restarts from the beginning, by going to START in Fig. 1. 4 (s)
    权利要求:
    Claims (4)
    [1]
    A communication apparatus consisting of a pair of communication nodes which have one or more modes of operation. The nodes are connected via a medium. Each node sends a link signal that can only be detected when the other node is in the same mode of operation. To reach a compatible mode of operation, each node cycles through the possible modes until a connection is established. There is a main mode, which is held for a time longer than any other mode plus 2M seconds, where M is the minimum time to establish a connection given that both nodes have the same operating mode.
    [2]
    A communication apparatus according to claim 1, wherein a second phase is started as soon as a common mode of operation has been obtained. In this second phase, both nodes cycle through all possible phases of operation, sorted from best to worst mode. The first compatible mode is the one that will be used.
    [3]
    A communication apparatus according to claim 1 or 2, wherein the medium is fiber optic medium and the modes of operation are different wavelengths.
    [4]
    A communication apparatus according to claim 1, 2 or 3, wherein the operating modes are speed settings for the communication. 5 (6)
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    同族专利:
    公开号 | 公开日
    SE535142C2|2012-04-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2016-11-29| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE0900539A|SE535142C2|2009-04-22|2009-04-22|Automated negotiation of point-to-point data connection settings|SE0900539A| SE535142C2|2009-04-22|2009-04-22|Automated negotiation of point-to-point data connection settings|
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