A data transmission system includes probes (probe A, probe B) connected between end user sites (site A, site B) and a data switching network (12). Each probe is connected to the switching network (12) via an access channel (20, 21, 26 or 27) wherein transmission circuits establish paths between the sites through the access channel (20, 21, 26 or 27) and switching network (12). The probes capture and retransmit data traveling between the sites over respective transmission circuits, and can thereby insert service level anaylsis (SLA) messages into data traffic in order to actively communicate network performance information to other probes. For each transmission circuit, the probes periodically collect measurements related to one or more network performance metrics, including round-trip delay (RTD), data delivery ratio (DDR) and network availability. During each SLA measurement cycle, a sequence of SLA messages is exchanged over each transmission circuit, which messages contain data used to determine RTD and DDR.

Method and apparatus for performing service level analysis of communications network performance metrics

An ATM network switch and method of utilization for adaptively providing integrated services therein is disclosed. In providing such integrated services, if the allocated bandwidth for one connection has been consumed, or if the connection is not entitled to allocated bandwidth, the connection can optionally use dynamic bandwidth arbitration, or a combination of both allocated and dynamic. The switch includes an input port processor, a bandwidth arbiter, and an output port processor. Cells are transmitted from the input to the output, under the control of respective port processors and the bandwidth arbiter. Flow control is implemented on a per-connection basis. Individual queues are then assigned to traffic type groups in order to provide traffic type flow control. Based upon prioritization information associated with the cell at the input, cells are prioritized and transmitted from the output, with each cell maintained in the same order, relative to other cells on a connection, in which it was received.

Allocated and dynamic bandwidth management

An asynchronous transfer mode (ATM) based service consolidation switch (10) includes an input/output module (22) having a to-switch port (TSPP) processor (90) and a from-switch port processor (FSPP) (92). The TSPP (90) and the FSPP (92) communicate with a bandwidth arbiter (114), multipoint topology controllers (116), and a data crossbar (117) on a switch control module (32). The TSPP (90) receives traffic over links for conversion into an internal cell format. Internal cells are buffered until allowed to transfer to an appropriate FSPP (92). Multipoint topology controllers (116) performs translations for internal switch flow control through interactions between the TSPPs (90), FSPPs (92), and the bandwidth arbiter (114). The bandwidth arbiter (114) performs appropriate bandwidth arbitration to allow internal cells to flow from TSPPs (90) to FSPPs (92) over the data crossbar (117).

Asynchronous transfer mode based service consolidation switch

A system for managing resources such as buffers and bandwidth which are allocated to competing entities through two or more levels in a telecommunications network is disclosed. The system provides a tool to allocate resources for use by individual entities. Each entity may be assigned a Minimum -- Guaranteed variable and a Maximum -- Allowed variable. When an entity requests resources the system determines if the entity is using its respective minimum guaranteed resource allocation which is specified by the Minimum -- Guaranteed variable. If the entity is not using its respective minimum guaranteed resource allocation, the system allocates a resource unit to the requesting entity. The system also allows a requesting entity to use additional resource units above the resource allocation specified by the Minimum -- Guaranteed variable, provided such resource units are available. If the entity has reached its respective minimum guaranteed resource allocation, but has not reached the respective maximum allowed resource allocation specified by the Maximum -- Allowed variable and no intervening level is using its respective maximum allowed resource allocation, then a resource unit is allocated to the requesting entity.

Hierarchical resource management with maximum allowable allocation boundaries

A network system for managing remote agents of a communication center includes a primary server connected to the network the primary server controlling at least one routing point; one or more secondary servers distributed on the network and accessible to the remote agents, the secondary server or servers having data access to agent computing platforms and communication peripherals; and, a software suite distributed in part to the secondary server or servers and distributed in part to one or more agents computing platforms and peripherals, the software suite including protocol for reporting agent status data. The system monitors agents computing platforms and peripherals for activity state through the one or more secondary servers whereupon the one or more secondary servers exchange control messaging and event related data using ISCC protocols with the primary server over the network for intelligent routing purposes.

Method and Apparatus for Extended Management of State and Interaction of a Remote Knowledge Worker from a Contact Center

A system for monitoring an ATM cross-connecting apparatus by inputting a test cell through a path for a main signal into the ATM cross-connecting apparatus, and examining the cell after the cell passed through the ATM cross-connecting apparatus. An initial value of a PN sequence and the PN sequence generated based on the initial bit sequence is written in the test cell before inputting to the ATM cross-connecting apparatus. When examining the test cell, the initial bit sequence and the PN sequence are read from the cell, a PN sequence is generated based on the initial bit sequence, and is then compared with the PN sequence read from the test cell to detect an error in the test cell. In addition, a bit pattern indicating a primitive polynomial to generate the PN sequence may be written in the test cell. In this case, the bit pattern is used for generating the PN sequence when examining the test cell. Further, the same VPI values may be written in both the header and the information field of the test cell before inputting the cell to the ATM cross-connecting apparatus, and the VPI value in the information field is compared with a VPI value in the header of the test cell when examining the test cell.

System for monitoring ATM cross-connecting apparatus by inside-apparatus monitoring cell

A cross-connection apparatus for B-ISDN includes plural interface units, multiplexers, virtual path identifier (VPI) conversion tables, demultiplexers, and loop-back units and a switch unit The interface unit has a reception port for receiving an ATM cell or inserting a monitor cell, and a transmission port for transferring the ATM cell or extracting the monitor cell; The multiplexer is operatively connected to corresponding interface unit for multiplexing the monitor cell; The VPI conversion tables is operatively connected to corresponding multiplexer for converting the VPI to change a transmission route of the monitor cell; The switch unit is operatively connected to the VPI conversion tables for switching the transmission route of the monitor cell based on the VPI; The demultiplexer is operatively connected to the switch unit for demultiplexing the monitor cell and transferring the monitor cell to the transmission port; The loop-back unit is operatively connected to corresponding interface unit for changing the transmission route so as to transfer the monitor cell to the same interface unit which the monitor cell is inserted, and as a result, the apparatus can be monitored by comparing the inserted monitor cell with the extracted monitor cell in the same interface unit

Cross-connection apparatus for b-isdn

A transmission circuit transmits a normal cell data and an idle cell data via a communication line. The idle cell data is transmitted to fill time slots in the communication line at which there is no normal cell data to be transmitted, each of the normal cell data and idle cell data including first data, second data and third data. The first, second and third data of the normal cell data respectively indicating a destination, an error correcting code of the first data and desired information. The first and second data of the idle cell data have predetermined bit patterns and the third data of the idle cell data may have any arbitrary bit pattern. The transmission circuit includes a first output circuit for outputting the normal cell data, an error correcting code generator for generating the second data based on the first data of the normal cell data supplied from first output circuit, a second output circuit for outputting the first and second data of the idle cell data, a scrambler for scrambling the third data of the normal cell data supplied from the first output circuit and a selector for selecting one of the first output circuit, the error correcting code generator, the second output circuit and the scrambler in accordance with a predetermined order, so that the normal cell data and the idle cell data are output from the selector.

Transmission circuit for transmitting fixed-length data

PURPOSE: To lengthen transmission line length for parallel data, and also, to execute a high speed transfer of the parallel data. CONSTITUTION: In the skew cancel system for cancelling a skew of a data signal generated in parallel transmission lines between a transmitting part 1 and a receiving part 2, the receiving part 2 is provided with skew cancel parts 3 0 -3 n for forming one or two or more delay data signals Db, Dc by delaying successively a receiving data signal Da, and also, selecting receiving or delay data signals Da-Dc whose phase is near a reference clock signal Ca by comparing the phases between the receiving and delay data signals Da-Dc and the reference clock signal Ca, or between the receiving data signal Da and the reference clock signal Ca, and one or two or more delay clock signals Cb, Cc formed by delaying them successively, and by transmitting test data from the transmitting part 1, selection in each skew cancel part 3 0 -3 n is locked. COPYRIGHT: (C)1993,JPO&Japio

Skew cancel system

A circuit includes a middle-voltage-detection circuit which detects a substantially middle voltage between a HIGH level and a LOW level of a signal voltage, and supplies the substantially middle voltage as a reference voltage. The circuit further includes a differential amplifier which receives the signal voltage and the reference voltage.

Naito Hidetoshi

Papers

System for monitoring ATM cross-connecting apparatus by inside-apparatus monitoring cell

Cross-connection apparatus for b-isdn

Transmission circuit for transmitting fixed-length data

Skew cancel system

Circuit for comparison of signal voltage with reference voltage