International Business Machines Corporation

Fujitsu Network Communications, Inc.

Fujitsu Corporation

Stmicroelectronics Gmbh

Alexander A Smith

Brad D Stilwell

Dominic DeMarco

Christopher Loers

David X Chen

Edward T Sullivan

Masahiro Shinbashi

Edward Y Qian

Daniel Joseph Mieczkowski

Michel M Colmant

Gary Franklin Chard

Guoliang Wu

Robert W Krug

William A McIntosh

Embodiments of the invention include methods and systems for improving test case coverage. Aspects of the invention include executing, by a processor, a first test case, where the first test case includes a plurality of system calls to an operating system. Prior to execution of each system call in the plurality of system calls in the first test case, executing, by the processor, a pre-exit instruction. Responsive to execution of the pre-exit instruction, collecting pre-exit system call data regarding each system call in the plurality of system calls for the first test case. The processor executes a post-exit instruction after completion of each system call in the plurality of system calls and responsive to execution of the post-exit instruction, collects post-exit system call data regarding each system call in the plurality of system calls for the first test case.

Measuring and improving test coverage

Embodiments of the invention include systems for testing pre and post system call exits. Aspects include executing a first test case comprises system calls and the first test case initializes a common buffer and stores system call parameters for each of the system calls. A monitoring test case is executed comprising: a pre-exit instruction that is inserted before each system call in the first test case. A post-exit instruction is inserted after each of the system calls in the first test case. Execution of the pre-exit instruction is determined prior to an execution of each system call. A first bit location is set in the common buffer to one, based on determining the pre-exit instruction executes. The system call is executed and execution of the post-exit instruction is determined. A second bit location in the common buffer is set to one based on determining that the post-exit instruction executes.

Testing pre and post system call exits

A network element for a telecommunications network includes a port for connection to a transmission line of the telecommunications network. A plurality of transmission line interfaces each include a scheduler to transmit traffic in port transmission slots allocated to the transmission line interface. An interface controller is stored in a storage medium of the network element. The interface controller is operable to selectively couple at least two transmission line interfaces to the port and to allocate a disparate portion of port transmission slots to each of the transmission line interfaces coupled to the port.

Method and system for transmitting traffic in a virtual tunnel of a transmission line

An apparatus and method for switching redundancy control which provides fast switching from a malfunctioning component to a redundant component with minimum data flow interruption for both transmitted and received data. The redundancy control system having an APS (Automatic Protection Switching) Hub, at least a working and a redundant tributary card, a bridge to provide identical traffic to the working and redundant tributary cards, a working and a redundant STM switching fabric, selectors within the working and redundant STM switching fabrics for selecting the traffic from the working tributary card to further process, a working and a redundant ATM switching fabric, a working and a redundant ATM processor and ATM selectors for selecting traffic needing cell switching from the working STM switching fabric to process further. The system is capable of monitoring itself to detect failures and the APS Hub is outfitted so as to become aware of detected failures and initiate a switch in the appropriate selectors or ATM selectors so as to change the traffic being further processed from the failed working component to the redundant component.

Switching redundancy control

A system includes a communication device that includes a number of interface cards and a switching complex. Upon receiving a data signal, an input card modifies header bits of the data signal to identify an input port on which the data signal was received. The switching complex uses the modified header bits to communicate the data signal to an output card and associated output port. In a particular embodiment, the switching complex may also modify header bits to identify the input card.

System and method for communicating data using modified header bits to identify a port

An Ethernet device and the method for applying back pressure within an Ethernet communication network comprising the steps of asserting a back pressure pin of a media access control unit associated with a network communications port of an Ethernet device. In response to asserting the back pressure pin, only the back pressure continuous preamble of a packet is transmitted without a start-of-frame delimiter onto the network.

Ethernet device and method for applying back pressure

An apparatus and method for switching redundancy control which provides fast switching from a malfunctioning component to a redundant component with minimum data flow interruption for both transmitted and received data. The redundancy control system having an APS (Automatic Switching Protection) Hub, at least a working and a redundant tributary card, a bridge to provide identical traffic to the working and redundant tributary cards, a working and a redundant STM switching fabric, selectors within the working and redundant STM switching fabrics for selecting the traffic from the working tributary card to further process, a working and a redundant ATM switching fabric, a working and a redundant ATM processor and ATM selectors for selecting traffic needing cell switching from the working STM switching fabric to process further. The system is capable of monitoring itself to detect failures and the APS Hub is outfitted so as to become aware of detected failures and initiate a switch in the appropriate selectors or ATM selectors so as to change the traffic being further processed from the failed working component to the redundant component.

A communication adapter transfers synchronous or multimedia and asynchronous or packet data between a network which may be of a FDDI type and a host system in real time. The adapter can manage data transfer in both directions between the system and the network and automatically switches between multimedia and packet data while holding the token. The adapter includes a queue manager having a synchronous threshold register and counter and a packet data threshold register and counter. The queue manager is coupled among a host bus; a storage means; a FDDI network; and bandwidth control logic. The queue manager in conjunction with the bandwidth control logic can dynamically switch the adapter from transmitting packet or synchronous data to the FDDI without exceeding bandwidth. The queue manager is also adapted to initiate capture of the token on a FDDI and commence transmission of synchronous or packet data frames to the ring as early as possible.

Communications system and method for efficient management of bandwidth

A queue manager manages multiple interfaces among a network, a host bus and a storage means including multiple circular FIFO's in a data communication system handling packet and multimedia data transferred, in either direction, between the host bus and the network. The queue manager includes a programmable parameter RAM interface, computation logic and status means. An efficient queue management algorithm dynamically manages storage of data in the circular multiple FIFO's as data is transferred, in either direction, between the host bus and the network. System bandwidth is allocated by the queue manager to the queues which have the most activity thereby improving the speed of transferring data while reducing the amount of bandwidth that would otherwise be required by prior systems. The programmable interface permits a user to define and dynamically configure the multiple circular FIFO storage means to include other parameters useful in the management of data transferred between the host bus and the network.

Growing community of inventors

Carrollton, TX, United States of America

Alexander A Smith