Abstract: A method may include receiving a stream of datagrams, the datagrams having a first bit length. The method may also include selecting a block of bits from consecutively-received datagrams, the block having a second bit length greater than the first bit length. The method may additionally include determining whether a particular data field is present at a particular bit position within the block. The method may further include outputting the block as a valid block in response to determining that the particular data field is present at the particular bit position. The method may additionally include, in response to determining that the particular data field is not present at the particular bit position: discarding a received datagram from the stream of datagrams; and repeating the receiving, selecting, determining, and discarding steps until a determination is made that the particular data field is present at the particular bit position.

Abstract: RPR traffic management concepts are extended to individual client flows while adhering to the station level traffic management functions by using a two tiered shaper approach. The first tier manages the client level SLAs and feeds the second tier which provides the aggregate station level traffic management functions. This approach allows sharing of a single RPR station without the compromises and side affects associated with the other techniques. Apparatus for Resilient Packet Ring traffic management comprises a stage queue selection block operable to hold client and control traffic for transmission, a queue level traffic shaper operable to control an add rate of client data add traffic and to provide queue specific send indications to the stage queue selection block, and a ringlet level traffic shaper operable to control traffic flow for a Resilient Packet Ring ringlet and to provide aggregate send indications to the stage queue selection block.

Abstract: A method and system for communicating traffic on an emulated subnetwork of a telecommunications ring having a plurality of nodes interconnected by a transmission media includes obtaining traffic at a node on the telecommunications ring. The traffic is segmented into a plurality of discrete segments. A set of broadcast cells is generated by adding an address header to each segment. The address header identifies a virtual channel dedicated to the node on the subnetwork in the telecommunications ring. The set of broadcast cells are transmitted in the virtual channel of the subnetwork and within a frame of the telecommunications ring. At each remaining node on the telecommunications ring, in response to receiving the set of broadcast cells in the virtual channel, both retransmitting and processing the broadcast cells.

Abstract: In a usage parameter control device for an asynchronous transfer mode communications system, a determination is made as to whether either of the respective storage elements maintaining values for (1) the time of arrival of a cell (TTA and (2) the time value at which the “bucket” will have drained to an empty condition (TTAT) has wrapped relative to the other. The wrap determination is made prior to the comparison between the TTA and TTAT values which is made in order to determine whether the user is complying with his or her contracted parameters. If one of the storage elements has wrapped relative to the other, the comparison between the TTA and TTAT values is modified accordingly.

Abstract: A method and system for communicating traffic on an emulated subnetwork of a telecommunications ring having a plurality of nodes interconnected by a transmission media includes obtaining traffic at a node on the telecommunications ring. The traffic is segmented into a plurality of discrete segments. A set of broadcast cells is generated by adding an address header to each segment. The address header identifies a virtual channel dedicated to the node on the subnetwork in the telecommunications ring. The set of broadcast cells are transmitted in the virtual channel of the subnetwork and within a frame of the telecommunications ring. At each remaining node on the telecommunications ring, in response to receiving the set of broadcast cells in the virtual channel, both retransmitting and processing the broadcast cells.

Abstract: In a usage parameter control device for an asynchronous transfer mode communications system, a determination is made as to whether either of the respective storage elements maintaining values for (1) the time of arrival of a cell (TTA and (2) the time value at which the “bucket” will have drained to an empty condition (TTAT) has wrapped relative to the other. The wrap determination is made prior to the comparison between the TTA and TTAT values which is made in order to determine whether the user is complying with his or her contracted parameters. If one of the storage elements has wrapped relative to the other, the comparison between the TTA and TTAT values is modified accordingly.

Abstract: In a usage parameter control device for an asynchronous transfer mode communications system, a determination is made as to whether either of the respective storage elements maintaining values for (1) the time of arrival of a cell (TTA) and (2) the time value at which the “bucket” will have drained to an empty condition (TTAT) has wrapped relative to the other. The wrap determination is made prior to the comparison between the TTA and TTAT values which is made in order to determine whether the user is complying with his or her contracted parameters. If one of the storage elements has wrapped relative to the other, the comparison between the TTA and TTAT values is modified accordingly.

Abstract: In a usage parameter control device for an asynchronous transfer mode communications system, a time counter is divided into multiple phases to enable audits of each of the virtual connections being handled by the system to be performed on a staggered group-by-group basis rather than all at once, thereby avoiding excessive delays in cell processing.

Abstract: The integrity of a signal path through a transmission system (12), which processes successive blocks (14) of data during a given time frame, verified by establishing the parity of a selected one of the blocks as it enters and as it leaves the system. A lack of equality between the parities is indicative of a lack of path integrity.

Abstract: Disclosed is a circuit which allows an n-bit time slot interchanger (TSI) to process m-bit wide information, where m is some fraction of n. A packing circuit receives the information from the TSI in the form of a series of n-bit segments. The circuit will choose m bits from each segment and produce an n-bit output which includes the m-bit segments in a desired order. The n-bit output can then be looped back to the TSI for insertion into an appropriate time slot.

Abstract: A remote terminal for a subscriber loop carrier network operates by flow from one to another of units in the terminal of time division multiplexer data streams of binary valued digital bits. Each stream has the format of periodic frames of time slots of which each frame consists of (a) a service time slot containing only service bits, and (b) a plurality of customer slots which contain mostly bits coded with data from customers of the network, but which also include a less number of service bits. Each unit includes encoding means responsive to local synchronizing and clock pulses derived from data incoming to the unit to encode on each frame of the outgoing data stream synchronizing information consisting of (c) a synchronizing pattern comprising a coded sequence of service bits localized in the frame's service slot and (d) a spoiler pattern formed of service bits distributed over customer slots in the frame.