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| Universal remote TV mouse |
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| Image and video processing with chrominance attenuation |
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| IC card |
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| Security device, including a memory and/or a microcomputer for data processing machines |
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| System for phase-locking a clock to a digital audio signal embedded in a digital video signal |
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| Audio signal section apparatus |
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Arrangement for determining link latency for maintaining flow control in full-duplex networks
| Details |
Inventors: Mangin, James; Kadambi, Jayant; Kalkunte, Mohan; Merchant, Shashank C.;
Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA)
Primary Examiner: Olms; Douglas
Assistant Examiner: Pizzaro; Ricardo M.
Attorney, Agent or Firm:
Apparatus and method for more precise controlling of congestion on a network, provides for remote controlling of a remote station on the network by a local station to configure the remote station into a remote loopback configuration. With the remote station thus configured, the local station is then able to determine the link latency of the link, during auto-negotiation, for example. Provided with the link latency, a congestion control algorithm in the local station may be adjusted to account for the link latency to better control the input data streams by controlling when the congestion relieving control signal, such as a PAUSE frame, is transmitted to the remote station to inhibit transmission and relieve congestion. |
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DETAILED DESCRIPTION There is a need for an arrangement that determines when to initiate flow control by a network element, taking into account the latency of a link, i.
e.
, the round-trip delay of a point-to-point full-duplex connection.
These and other needs are met by the present invention which provides a method of determining a link latency between stations on a network, in which a physical layer of a remote station is placed into a remote loopback configuration so that all data received from the network is transmitted back onto the network.
A specified data pattern is transmitted from a local station to the remote station.
At the local station the specified data pattern that has been transmitted back onto the network by the remote station is detected.
The link latency between the local station and the remote station is then determined as a function of the time elapsed between the transmitting of the specified data pattern from the local station and the detecting of the specified data pattern at the local station.
The earlier stated needs are also met by another embodiment of the present invention which provides a method of controlling a remote station on a network, in which a remote loopback control signal is transmitted from a local station to a remote station.
At the remote station, the reception of the remote loopback control signal is detected.
The remote station is configured in response to the reception of the remote loopback control signal such that all data received from the network is transmitted back onto the network.
The earlier stated needs are also met by a still further embodiment of the present invention which provides a method of controlling congestion at a local station in a network, comprising the steps of placing a physical layer of a remote station into a remote loopback configuration such that all data received from the network is transmitted back onto the network.
A specified data pattern is transmitted from a local station to the remote station.
The specified data pattern that has been transmitted back onto the network by the remote stations detected at the local station
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