David R Mcdaniel

US Patent:

6510214, Jan 21, 2003

Filed:

Dec 30, 1998

Appl. No.:

09/223234

Inventors:

David W. McDaniel - Dallas TX

Assignee:

Alcatel USA Sourcing, L.P. - Plano TX

International Classification:

H04M 1500

US Classification:

379134, 37911204, 3791121, 37922109

Abstract:

A service control point ( ) includes an overload control system ( ) that determines an overload rating ( ) for an intelligent processing unit ( ). The overload control system ( ) includes a latency estimator ( ) that requests and receives a latency ( ) for a service logic interpreter ( ). A queue depth store ( ) receives a queue depth ( ) from the service logic interpreter ( ). A common memory ( ) stores the latency ( ) and the queue depth ( ) in memory mapped files. A load estimator ( ) determines the overload rating ( ) in response to the latency ( ) and the queue depth ( ). The load estimator ( ) compares the overload rating ( ) to a previous overload rating and issues an internal problem report if a difference is detected. A TCAP interface ( ) and a service logic program ( ) assess the overload rating ( ) to determine if incoming service requests should be passed on to the service logic interpreter ( ), rerouted, or discarded. The load estimator ( ) provides the overload rating ( ) to an overload server ( ).

US Patent:

7114005, Sep 26, 2006

Filed:

Feb 5, 2002

Appl. No.:

10/072069

Inventors:

David W. McDaniel - Dallas TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 15/16
H04M 1/66

US Classification:

709245

Abstract:

A communication system includes translation modules that provide address hopping to secure packet-based communications. A transmitting translation module modifies source and/or destination addresses of communicated packets and a receiving translation module resolves each modified source and/or destination address into the original source and destination addresses for the packets.

US Patent:

20070041327, Feb 22, 2007

Filed:

Aug 16, 2005

Appl. No.:

11/204964

Inventors:

William Foster - Nanaimo, CA
Leo Nieuwesteeg - Plano TX, US
Flemming Andreasen - Marlboro NJ, US
David McDaniel - Dallas TX, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 11/00
H04J 3/14

US Classification:

370242000, 370218000, 714001000

Abstract:

A mechanism that provides for communication of heartbeat signals from servers (call agents) to clients (gateways) in a packet telephony network environment. Clients listen for receipt of multicast heartbeats from any of the servers that may be part of a multicast group. A client assigned to a particular server for control messaging, upon failure to receive a response to a message sent to the assigned server and failure to receive a heartbeat from the assigned server, may select a second server from among the servers and re-send the message to the second server. Without receipt of heartbeat signals, the client defaults to a normal retry behavior for re-sending the message first to the assigned server a number of times before attempting to re-send the message to the second server. With receipt of the heartbeat from the second server, the client adopts an aggressive retry behavior by re-sending the message to the assigned server a lesser number of retries before attempting to re-send the message to the second server. The clients use the multicast heartbeats as a hint, allowing them to switch to the more aggressive retry behavior and consequently reduce the time to re-associate with a new server and re-establish a new security association (if IPsec is used), resulting in a drastic reduction in service delay due to server failures.

US Patent:

62693964, Jul 31, 2001

Filed:

Dec 11, 1998

Appl. No.:

9/211016

Inventors:

Mahesh V. Shah - Plano TX
David W. McDaniel - Dallas TX
James R. Vatteroni - Allen TX
Stephen B. Jaggers - Allen TX
Mark E. Worline - Allen TX

Assignee:

Alcatel USA Sourcing, L.P. - Plano TX

International Classification:

G06F 1300

US Classification:

709223

Abstract:

A method of providing a software interface between application programs performing telecommunications functions and an operating system running on at least one node at a site supporting the application programs, and further forming an interface between the application programs and a telecommunications network is provided. The method includes providing a network platform manager operable to remove nodes from service, restore nodes to service, remove applications from service, and restore applications to service, providing a network system integrity manager operable to monitor the nodes and to enable failed nodes to recover, providing a configuration manager operable to interface with a host coupled to the telecom platform, providing a node platform manager operable to provide management functions for a node, providing a service manager operable to start and stop processes at the direction of the node platform manager, and providing a node system integrity manager operable to monitor inter-node links.

US Patent:

56445750, Jul 1, 1997

Filed:

Dec 6, 1995

Appl. No.:

8/567967

Inventors:

David W. McDaniel - Dallas TX

Assignee:

DSC Communications Corporation - Plano TX

International Classification:

H04L 1256

US Classification:

370416

Abstract:

A telecommunications network (10) includes a plurality of transport node controllers (18) that interface with a plurality of local communication processors (16) for the transfer of telecommunications information between subscribers (14) associated with the local communication processors (16) and also for subscribers remote from the transport node controller (18). The transport node controller (18) includes a buffer memory (24) with a pool of buffers (26). A local processor controller (22), in conjunction with a remote processor (20), allocate the buffers (26) within the buffer memory (24) among the plurality of local communication processors (16) and remote communication processors communicating to the transport node controller (18) through a message transporting network (12). The local processor controller (22) assigns a buffer (26) to each of the plurality of local communication processors (16). A message processed by one of the local communication processors (16) is temporarily stored within its associated message-in buffer (26).