Robert H Constantin, 6311 Fremont St, Dartmouth, MA 02748

6483807, Nov 19, 2002

Mar 16, 1999

09/270580

Thomas A. Manning - Northboro MA
David N. Peck - Northbridge MA
Robert Constantin - Cambridge MA
David E. Hammond - Bedford NH
Andrew Michal - Windham NH
Stephen R. Veit - Chesterfield MO

Fujitsu Network Communications, Inc. - Richardson TX

G01R 3108

370236, 370396, 370400, 370410, 709238

Each switch along a call setup path in a network decides whether the call request should be upgraded from a non-flow-controlled service type to a flow-controlled service type. Each switch bases the decision on whether a boolean variable for the calling subscriber that appears in a management information base (MIB) is set to a value indicating that the subscriber is entitled to the upgrade. In addition, the upgrade is performed only if an interface on the route to the called party on which the call setup request is to be forwarded supports flow-controlled connections. When the call is to be upgraded, the switch replaces the service type indicator in the setup message with a value indicating a flow-controlled service type, and forwards the setup message toward the called subscriber. If the MIB variable is set to a value indicating that the upgrade is not to be performed, it is still possible for a subscriber to request flow-controlled service directly, by indicating this service type in the original call setup message. Each switch also makes a call downgrade decision.

6862288, Mar 1, 2005

Jan 16, 2001

09/761144

Shantnu Sharma - Acton MA, US
Peter W. Bretschneider - Brookline NH, US
Robert H. Constantin - Cambridge MA, US
Mark A. W. Stewart - Belmont MA, US
Sajin R. Valoth - Norwood MA, US
Mashood Illikkal - Lowell MA, US

Fujitsu Network Communications, Inc. - Richardson TX

H04L012/56

370403, 370248, 370216

A highly available communications system capable of circuit reestablishment and tear-down without manual intervention. The communications system includes a plurality of nodes interconnected by a plurality of communications paths to form at least one communications network. The nodes forward control packets on the network by way of a signaling protocol employing an out-of-band control technique. At least a portion of the nodes comprises a software configuration including a topology manager and a protocol manager. The protocol manager is operative to determine whether a control path is operational and whether a data transmission channel along a corresponding data path is established. In the event the control path is not operational, the protocol manager maintains the data transmission channel along the data path so long as the channel is established. The topology manager is operative to acquire network topology data, and the protocol manager is further operative to receive the topology data, deduce network topology changes therefrom, and reestablish and tear-down communications paths interconnecting the nodes based at least in part on the deduced topology changes.

6198725, Mar 6, 2001

Mar 16, 1999

9/270574

Robert Constantin - Cambridge MA
David E. Hammond - Bedford NH
David N. Peck - Northbridge MA
Salma Abu-Ayyash - Cambridge MA
Stephen R. Veit - Chesterfield MO
Thomas A. Manning - Northboro MA

Fujitsu Network Communications, Inc. - Richardson TX

H04L 1228
H04L 1256

370235

A system for allocating resources at network elements along a path through a communications network. Resources are allocated at a network element along the path in response to a connection request message. The delay budget is the minimum of a calculated cell transfer delay and a calculated cell delay variation. The calculated cell transfer delay is determined by finding a difference between a target end to end cell delay and an accumulated cell delay, and then dividing that difference by a number of network elements remaining in the path between the network element and the end of the path. To determine the calculated cell delay variation, the network element first finds a difference between the Max CDV QoS parameter and the sum of the accumulated cell delay variation and the switching delay for the network element. The calculated cell delay variation is then equal to that difference divided by the number of network elements remaining in the path between the network element and the end of the path. The target end to end cell delay is for example determined by the first network element in the path as equal to the Max CTD QoS parameter minus the end to end link propagation delay for the path and the link propagation delay for the incoming link to the first network element over which the message was received.

5671357, Sep 23, 1997

Sep 6, 1996

8/708109

Pierre A. Humblet - Cambridge MA
Michael G. Hluchyj - Wellesley MA
Whay Chiou Lee - Cambridge MA
Robert Constantin - Newton MA

Motorola, Inc. - Schaumburg IL

G06F 1300
H04L 2902

39520011

The method and system implement a black-out timer to schedule intermediate network topology updates in coordination with a predetermined periodic network topology update timer to minimize redundant topology updates. Topology update scheduling in accordance with the present invention provides a significant enhancement to the efficiency of topology updating.