Lawrence S Davis

US Patent:

6967949, Nov 22, 2005

Filed:

Aug 23, 2004

Appl. No.:

10/925175

Inventors:

Lawrence D. Davis - Petaluma CA, US
Edward W. Boyd - Petaluma CA, US
Glen Kramer - Petaluma CA, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04L012/56

US Classification:

370390, 370389, 370392, 370409

Abstract:

One embodiment of the present invention provides a system that facilitates forwarding of packets in an Ethernet passive optical network (EPON), which includes a central node and at least one remote node. During operation, the system assigns a logical link identifier (LLID) to a remote node, wherein an LLID corresponds to a logical link between the central node and a remote node. The system also associates an LLID with a port of a switch within the central node, wherein the switch has a number of ports; wherein a port may be a physical port or a virtual port; and wherein the number of ports on the switch are divided into network-side ports and user-side ports. Upon receiving a downstream packet from a network-side port, the system searches a mapping table to determine whether one or more field values of the downstream packet correspond to any LLIDs or ports. If the one or more field values correspond to an LLID, the system assigns the LLID to the downstream packet and transmits the downstream packet to a remote node.

US Patent:

7289501, Oct 30, 2007

Filed:

Nov 6, 2003

Appl. No.:

10/703359

Inventors:

Lawrence Drew Davis - Petaluma CA, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04L 12/28
H04L 12/56

US Classification:

370390, 370432, 398 98

Abstract:

One embodiment of the present invention provides a system that facilitates bandwidth-efficient multicast in EPONs. The system includes a central node and at least one remote node. Downstream data from the central node is broadcast through a passive optical coupler to remote nodes. In the other direction, upstream data from a remote node is transmitted through the passive optical coupler to the central node in a unicast manner. During operation, the system first selects a common multicast LLID to represent a number of remote nodes that comprise a multicast group. Upon receiving a multicast message destined to the multicast group, the system sends the multicast message along with the multicast LLID for the multicast group, whereby the multicast message is broadcast through the passive optical coupler in the downstream direction. This allows each remote node belonging to the multicast group to receive the multicast message by matching the multicast LLID.

US Patent:

7349537, Mar 25, 2008

Filed:

Mar 10, 2005

Appl. No.:

11/078923

Inventors:

Glen Kramer - Petaluma CA, US
Lawrence D. Davis - Petaluma CA, US
Edward W. Boyd - Petaluma CA, US
Ryan E. Hirth - Windsor CA, US
Ngo Thahn Ho - Arlington TX, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04K 1/00
H04L 9/00
H04L 9/28
H04J 14/00

US Classification:

380 28, 380256, 380277, 380284, 398 71, 713160

Abstract:

One embodiment of the present invention provides a system that decrypts downstream data in an Ethernet passive optical network (EPON). During operation, the system receives a data frame which is encrypted based on a remote input block and a session key, wherein the remote input block is constructed based on a remote cipher counter and a remote block counter. The system adjusts a local cipher counter based on a received checksum located in a preamble of the data frame, wherein the local cipher counter is substantially synchronized with the remote cipher counter. In addition, the system truncates the local cipher counter by discarding n least significant bits thereof. The system then constructs a local input block based on the truncated cipher counter and a local block counter for the received data frame. Next, the system decrypts the data frame based on the local input block and the session key.

US Patent:

7525982, Apr 28, 2009

Filed:

Sep 16, 2005

Appl. No.:

11/228879

Inventors:

Glen Kramer - Petaluma CA, US
Edward W. Boyd - Petaluma CA, US
Ryan E. Hirth - Windsor CA, US
Lawrence D. Davis - Petaluma CA, US
Lowell D. Lamb - San Ramon CA, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04L 12/28

US Classification:

370431

Abstract:

One embodiment of the present invention provides a method for facilitating asymmetric line rates in an Ethernet passive optical network (EPON) which includes a central node and at least one remote node. During operation, the system provides a downstream code-group clock, wherein each cycle thereof corresponds to a code group transmitted from the central node to a remote node. The system also provides an upstream code-group clock, wherein each cycle thereof corresponds to a code group received at the central node from a remote node. In addition, the system provides a multi-point control protocol (MPCP) clock, wherein the frequency ratio of the MPCP clock to the downstream code-group clock is different from the frequency ratio of the MPCP clock to the upstream code-group clock, thereby allowing the downstream transmission to be performed at a faster line rate than the upstream transmission line rate.

US Patent:

7545813, Jun 9, 2009

Filed:

May 21, 2004

Appl. No.:

10/850738

Inventors:

Lawrence D. Davis - Petaluma CA, US
Glen Kramer - Petaluma CA, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04L 12/28

US Classification:

3703954, 370458, 370461, 396168

Abstract:

One embodiment of the present invention provides a system that facilitates registration of remote nodes in an Ethernet passive optical network (EPON). The system includes a central node and at least one remote node, wherein a number of virtual remote nodes are coupled to a common physical remote node and transmit upstream data through a common transmitter within the common physical remote node. During an initial discovery cycle, the system receives a solicitation message from the central node at a remote node, wherein the solicitation message assigns a discovery slot in which an unregistered remote node may transmit a response message to the central node for registration. The system then transmits a response message from an unregistered remote node to register within the assigned discovery slot. If multiple virtual remote nodes coupled to the common physical remote node seek registration concurrently, the system controls the transmission of response messages from these virtual remote nodes to the central node so as to avoid collisions between response messages from different remote nodes.

US Patent:

D602430, Oct 20, 2009

Filed:

Jan 26, 2009

Appl. No.:

29/331462

Inventors:

Chris Green - San Francisco CA, US
Lawrence E. Davis - Atlanta GA, US
Daniel R. Bauen - Atlanta GA, US

Assignee:

Amazon Technologies, Inc. - Seattle WA

International Classification:

1302

US Classification:

D13110

US Patent:

7664019, Feb 16, 2010

Filed:

Sep 8, 2005

Appl. No.:

11/223487

Inventors:

Edward W. Boyd - Petaluma CA, US
Thyagarajan Subramanian - Rohnert Park CA, US
Lawrence D. Davis - Petaluma CA, US

Assignee:

Teknovus, Inc. - Petaluma CA

International Classification:

H04L 12/56
H04B 10/20

US Classification:

370230, 370392, 37039552, 398 58

Abstract:

One embodiment of the present invention provides a system for forwarding packets in an Ethernet passive optical network (EPON) which includes a central node and at least one remote node. During operation, the system associates a logical link identifier (LLID) to a logical link between the central node and a remote node, wherein the logical link corresponds to a priority level based on a certain service level agreement (SLA). After receiving a packet to be forwarded to a remote node, the system then determines the value of one or more fields within the packet which is used to indicate a priority level for the packet. Subsequently, the system assigns an LLID to the packet based on the value of the one or more fields, thereby facilitating differentiated service qualities within the EPON.

US Patent:

8113855, Feb 14, 2012

Filed:

Jan 26, 2009

Appl. No.:

12/360095

Inventors:

Chris Green - San Francisco CA, US
John E. Johnston - Redwood City CA, US
Lawrence E. Davis - Atlanta GA, US
Daniel R. Bauen - Atlanta GA, US

Assignee:

Amazon Technologies, Inc. - Reno NV

International Classification:

H01R 13/44

US Classification:

439131, 439172

Abstract:

Electrical power adapters comprising retractable prongs and/or retractable electrical outputs are disclosed. In one example, an electrical travel adapter includes a power unit having a retractable electrical output and a plug unit coupled to the power unit, the plug unit having a plurality of retractable prongs.