Method and apparatus avoiding capture effect by adding a slot time to an interpacket gap interval in a station accessing an ethernet network
First Claim
1. A method of accessing media of an Ethernet network, comprising:
- transmitting a first data packet from a network station onto the media;
detecting if the network station has a second data packet for transmission onto the media upon successful completion of the first packet transmission;
waiting after the transmitting step a delay time, including a predetermined interpacket gap interval and one slot time, if the detecting step detects said second data packet; and
attempting access of the media by the network station in response to the delay time.
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Accused Products
Abstract
Delay times are modified in Ethernet network devices by adding a slot time to the minimum interpacket gap (IPG) interval between uninterrupted consecutive transmissions by a network station. If a network station transmits a data packet and has another data packet to send, modified delay time prevents the station from contending for access of the media, enabling other stations having data to transmit to attempt access on the media. If a collision occurs during the transmission of a second successive data packet, the network station uses a modified collision arbitration and automatically sets the collision delay interval to zero for the first access attempt. If another collision occurs during the access attempt, the collision interval is calculated according to the truncated binary exponential backoff algorithm.
50 Citations
17 Claims
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1. A method of accessing media of an Ethernet network, comprising:
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transmitting a first data packet from a network station onto the media; detecting if the network station has a second data packet for transmission onto the media upon successful completion of the first packet transmission; waiting after the transmitting step a delay time, including a predetermined interpacket gap interval and one slot time, if the detecting step detects said second data packet; and attempting access of the media by the network station in response to the delay time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of mediating collisions on media of an Ethernet network, comprising:
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transmitting a first data packet from a network station onto the media; transmitting a second data packet by the network station after the first data packet, comprising the steps of; (1) setting a delay interval to include a predetermined interpacket gap interval and one slot time interval, (2) determining whether a receive carrier is asserted on the media, and (3) transmitting the second data packet after the transmission successful of the first data packet and in response to said delay interval if the receive carrier is not asserted on the media; sensing a collision on the media; setting a collision delay interval to zero if a number of collisions encountered by the network station equals one; and attempting access of the media in response to the detected collision and in response to the set collision delay interval. - View Dependent Claims (12)
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13. A method of mediating collisions on media of an Ethernet network, comprising:
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sensing a collision on the media caused in response to transmission of a current data packet by a network station; setting a collision delay interval in the network station to zero if the network station has successively transmitted a first data packet and said current data packet, and if a number of access attempts for transmitting said current data packet equals one; and attempting access of the media in response to the detected collision and after the collision delay interval. - View Dependent Claims (14, 15)
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16. A network interface for connection with media of an Ethernet network, comprising:
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a carrier sensor sensing deassertion of a receive carrier on the media; a delay time calculator selectively adding a slot time interval to a predetermined interpacket gap interval to obtain a delay time, the calculator adding the slot time interval to the predetermined interpacket gap interval in response to successful transmission of a packet by the network interface; and a media access device attempting access of the media in response to the sensed deassertion of the media and said delay time. - View Dependent Claims (17)
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Specification