Abstract: Alternate speech and data communication over a single circuit is implemented within a communication network which include first nodes which include both a data source and a speech source. Digital information, comprising either speech parameters or data, is sent in discrete blocks between the first node and a second node connected to the network. An inband signaling bit pattern is included within selected blocks sent by a TX-alternator in the sending node to indicate whether all following digital information is to be interpreted by the receiving node as speech or data and a RX-alternator in the receiving node interprets the digital information in accordance with the last received inband signaling pattern. One exemplary implementation is in a GSM cellular radio network in tandem free operation.

Abstract: The present invention is a signal processing method for use in a CDMA adaptive array antenna system, the method for forming the beam pattern by maximizing a transceiving gain in a direction toward a target mobile station and optimizing the beam pattern in a moving direction depended on a moving direction of each target mobile station during signal transceiving between a base station and the mobile station, the method forming an ideal beam pattern by a simplified computation procedure, and a computer readable recording medium for storing a program for implementing the method. The method comprises determining signature of gradient of output power of the array antenna to the phase of each antenna, updating the phase of each antenna by increasing or decreasing the phase by an adaptive gain depending on the signature of the corresponding gradient, determining weight corresponding to the updated phase, and applying the weight to a signal arrived at each antenna.

Abstract: Adjunct apparatus for increasing network transmission capacity provides a low-cost, efficient solution for increasing the network transmission capacity of the existing telephone circuit switched network, while keeping the current network equipment unchanged. A Local Switch Network (LSN) Adjunct (LSNA) and a Tandem/Toll Switch Network (TSN) Adjunct (TSNA) interface with standard network elements, such as switches and cross connect equipment. These network adjuncts, comprising a set of low-bit rate speech coders, a dynamic timeslot manager and other supporting functions, advantageously transmit to and receive from a T1/T3/0C3/E1 trunk. More than one channel of voice is carried on one 64 Kbps DSO timeslot, while still maintaining the voice at toll quality. A sub-timeslot and sub-timeslot bundling are introduced in the standard T1 or E1 frame where each sub-timeslot is analogous to a single bit of the typical eight bit word to provide more than 24 or 30 voice channels respectively.

Abstract: In transmitting communication signals to a receiver via a transmission channel, the transmitter generates a composite signal including information from which the receiver can determine a channel evaluation signal and other control information. The composite signal is transmitted over the transmission channel. This results in improved channel capacity, reduced power transmission requirements, and reduced interference in the transmission channel.

Abstract: A satellite direct radio broadcast system is provided which assembles bits of broadcast programs into prime rate increments, several of which are assembled into a frame. Frames are divided into symbols which are demultiplexed into alternating ones of a plurality of prime rate channels. The prime rate channels are demultiplexed onto a corresponding number of broadcast frequencies for transmission to a satellite. The satellite payload switches the symbols into time division multiplexed (TDM) data streams. The receivers process the TDM streams using service control headers (SCHs) provided therein by broadcast stations. The SCHs facilitate transmission of different service components within broadcast channel frames, association of a primary broadcast channel with one or more secondary broadcast channels on a frame-to-frame basis, and the transmission of multiframe bit streams, or auxiliary data throughout a broadcast channel that are independent of a service, in contiguous or non-contiguous frames.

Abstract: In traffic processes in a telecommunication system there is internal communication between service controlling entities which may belong to logical nodes in the same or different applications. Such a service controlling entity may be a service process controlling a service for a party of a call. The communication between the service controlling entities is controlled by rules given in a generic protocol. These rules imply lack of messages and use only of protocol parameters in the form of indivisible information transmission elements. Based upon the generic protocol, service protocols are specified, each corresponding to its service, and a protocol managing entity within an application handling the protocol management of a certain service according to the service protocol. The information elements are distributed by a communication service having a parameter distribution function for the protocol parameters, by transferring data between the protocol managing entities.

Abstract: The object of the invention is to provide a transmission method of the digital broadcasting that can be carried out under the digital broadcasting using the terrestrial waves and does not need complicated operations of using GUI screen.

Abstract: A control process controls transmission of digitally encoded messages (DEMs) over a data communications network to allow real-time performance. The control process establishes a communication path which DEMs are sent. The control process can operate according to any data communications protocol, including the protocol native to the communicating device. The control process can establish communication paths based upon least-cost routing determinations. When there is insufficient bandwidth or excessive latency, the control process can choose a secondary path over which to transmit a DEM.

Abstract: The present invention relates to a procedure for ensuring the operation of signalling channels in a V5 interface between a local exchange (LE) and an access node (AN). The interface includes at least two links (L), in conjunction with redefinition of the interface composition. Redefinition generally involves making changes in the V5 interface data, such as the location of signalling channels on the links. According to the invention, the operation of protected channels in conjunction with restarting is ensured by starting the protected channels on the channels defined for them in the new composition and on the channels to which they were transferred in conjunction with the protection switch-over.

Abstract: A communication system includes an interface between two networks, for example the public telephone system and an IP-based network. The system includes a modem bank which receives bearer channel inputs and provides outputs to the second network. A protocol converter interfaces with a signaling network such as a common channel signaling (CCS) network (e.g., an Signaling System 7 network). The protocol converter communicates signaling information to the modem bank. A resource manager is coupled to the protocol converter and includes a memory which stores status information relating to the system.

Abstract: Call queuing is implemented in a telecommunications advanced intelligent network. After a call to a busy subscriber line is queued, information about the queued call is colleted. Utilization statistics based on the collected queue utilization information are then generated and made available to the subscriber.

Abstract: When a sync pattern in a frame of a bit stream is detected to synchronize a data processing apparatus with the bit stream, data patterns containing a pattern identical to the sync pattern are often erroneously detected as the sync pattern. In order to overcome such problem, an apparatus for detecting data in a bit stream is provided. The bit stream contains a sequence of frames, and each frame has a predetermined number of bits and comprises a sync pattern and a data portion. The apparatus contains a detecting circuit, a counting circuit, and a synchronization signal generating circuit. The detecting circuit detects a first data pattern in the bit stream that equals the sync pattern and detects a second data pattern in the bit stream that equals the sync pattern. The counting circuit begins counting bits in the bit stream to generate a count value when the first data pattern is detected by the detection circuit.

Abstract: Scheme for the distinguishing of reachable objects and non-reachable objects used by an object-based application in a system with volatile memory of limited size. The object-based application operates on n objects whereby Z objects thereof are root objects. The following steps are carried out for each root object: (a) traversing from said root object to any other object that can be reached from said root object; (b) marking all objects that were reached from said root object and storing, while marking, in said volatile memory a description of the path from said root object to the currently visited object; if the marking phase reaches an object and the respective path does not fit into said volatile memory, then this object is not marked but identified as an object which has to be processed later; and continuing the marking phase until all root objects identified as objects which have to be processed later are processed.

Abstract: A data service providing method for use a communications system which has a forward traffic channel including a fundamental channel and a supplemental channel. The total transmission power of a base station is detected, and when it is complemental a reference transmission power data is transmitted on a forward link via a predetermined complemental channel. The complemental data is received from the forward link, and processed in a terminal.

Abstract: Call queuing is implemented in a telecommunications advanced intelligent network. After a call to a busy subscriber line in queued, a separate call to the subscriber is placed indicating status of the queued subscriber line access call. Call queuing and status notification may be accomplished with an intelligent peripheral. The subscriber notification may be made by placing a wireline call or by wireless notification, such as through a paging system.

Abstract: In a repeating apparatus of a layer 2 LAN, when a received frame is a destination-unknown frame, a frame for path detection having a shortest data length is generated using a destination address of the above-mentioned received frame and an address of the own apparatus and it is broadcasted; and when a responding frame returned from a repeating apparatus having found the destination for the above-mentioned frame for path detection is received, the above-mentioned received frame is transmitted for a transmission source of the above-mentioned responding frame.

Abstract: A method of communicating packet based digital data over a communications network between a sender and a receiver, includes steps of sending a request, the request having a plurality of packets, to a receiver; receiving an acknowledgement from the receiver for each packet of the request; receiving a reply from the receiver, the reply having a plurality of packets, at least one of the packets including an indication that the packet need not be acknowledged upon receipt; and acknowledging only the packets of the reply that do not contain the indication.

Abstract: A trading communication system. A line control unit includes a channel switch circuit, a number of line trunks connected to the channel switch circuit and adapted to be connected to a line network, and a number of line circuits connected to the channel switch circuit. A number of first terminal adaptors are connected to the line circuits. Some of the first terminal adaptors are adapted to be connected to a commercial switched circuit, while one of the first trading call terminals is connected to one of the first terminal adapters. A number of second trading call terminals are at locations remote from the line control unit. A number of second terminal adaptors are connected to the second trading call terminals and are adapted to be connected to the commercial switched circuit to connect the channel switch circuit to the second trading call terminals.

Abstract: Call queuing is implemented in a telecommunications advanced intelligent network. A determination is made that the call has been queued for a determined amount of time. The caller is requested to perform an action to remain in a queue. If the caller does not perform the requested action, the call is dequeued.

Abstract: A system for intelligent C-plane switching in the digital enhanced cordless telecommunications (DECT) system. The present invention includes a system that enables fast C-plane transmission mode during cordless telephone voice connections within the digital enhanced cordless telecommunications (DECT) system without degrading the voice quality. In order to perform this fast C-plane transmission mode during voice connections, one embodiment of the present invention, located within a cordless telephone handset, utilizes a silence detector circuit to determine the periods of silence within the voice data transmitted through the U-plane. By determining the periods of silence within the U-plane voice data, the present invention is able to direct the control data to be transmitted through the fast C-plane during the periods of silence.

Abstract: A telephony call-waiting system for clients having a computer with a video display unit (PC/VDU) and a public-switched telephony network (PSTN) telephone connected to the PSTN by a single line, keeps a status indication of the client's Internet connection status and, during periods of time the PC/VDU is connected to the Internet, alerts the client by an alert signal over the Internet connection of any waiting PSTN calls. In a preferred embodiment the client's PC/VDU is adapted to provide an audio and/or visual alert event when an alert signal is received, and to provide for a user-initiated response to an alert, accepting or rejecting a call. In the event a call is accepted, provision is made for connecting the accepted call to the client's PC/VDU as an IP call. In some embodiments several calls may be dealt with at the PC/VDU, and features are provided such as caller-ID on the client's VDU. Several ways of accomplishing the call-waiting system are taught.

Abstract: Procedure for subscriber addressing in a cascaded V5 interface in a data communication system comprising a telephone exchange (LE) with a number of subscribers defined in it, and access network (AN) connected to the telephone exchange via a first V5 interface (V5) and comprising a first access node (AN1), a second access node (AN2), which is connected to the telephone exchange, and a subscriber terminal (TE), which is connected to the local exchange via the access network and/or the second access node.

Abstract: A CAS data processing apparatus of an STM-1 interface block which is capable of processing CAS signaling data in real time is disclosed. The CAS data processing apparatus of the STM-1 interface block preferably includes a plurality of framers, which separately read signaling data streams from 21 E1 links, a CPU, which outputs a start signal in the CAS signaling data processing, a CAS signaling processing unit, which reformats the signaling data streams inputted from the plurality of the framers into report data in order of the each link, and a Common Memory, which stores the report data outputted from the CAS signaling processing unit.

Abstract: A billing system for use in a chargeable program broadcasting is capable of reliably billing a subscriber for program reception while preventing unauthorized reception thereof. A receiving terminal includes a primary terminal 100 and a secondary terminal 150. The primary terminal 100 receives a compressed video signal and confirms by an error checker 113 thereof whether there is a transmission error and bills, by a billing device 114 thereof, the receiving subscriber on the basis of an error information and a program information, etc., separated from the video signal by a separation circuit 112. The compressed video data is time-axis multiplexed with a terminal identifying code and a key signal and transmitted to the secondary terminal 150. In the secondary terminal 150, a bill for the subscriber is confirmed by the terminal identifying code and the compressed data is decoded by a decoder circuit 166 thereof.

Abstract: A method of sharing capabilities information between a plurality of nodes in a telecommunications network. The method begins when a new node is installed in the telecommunications network or the capabilities of a node are modified. The new or modified node sends an Exchange Data Directive (EXDATADIR) Invoke message to one or more cooperating nodes in the network. The EXDATADIR message is an intersystem node capabilities declaration message which includes parameters relating to communications capabilities and service support capabilities of the new or modified node. If the node is a new node, this is followed by sending EXDATADIR Return Result messages from each cooperating node to the new node. The EXDATADIR Return Result message is an intersystem node capabilities declaration message which includes parameters relating to services supported by the cooperating nodes.

Abstract: To exchange a digital data input stream, a transmitter sends the digital data input stream to a receiver, and the receiver sequentially divides the stream into different interleaved substreams and later combines the substreams to provide an output including the original digital data input stream. The original digital data input stream includes multiple subgroups of data, such as bytes. Each subgroup is stored in a selected buffer of the receiver. Buffers are selected in a predetermined order of rotation to store sequentially received subgroups. Thus, each buffer receives subgroups in a defined order. Later, each buffer outputs its stored subgroups in the same order as received. A data assembler assembles the subgroups output by the various buffers, reconstructing the original digital input stream.

Abstract: A method for communicating between users which employ a plurality of communication devices over a packet switched network. The method includes the steps of receiving a precommunication request for a communication device or devices of said recipient to which said communication should be sent, determining in accordance with a communication receipt preferences of the recipient which communication device or devices should receive said communication and transmitting an indication to the requester to which communication device or devices said communication should be transmitted. The communication itself may be a single media or a multimedia communication.

Abstract: A network (10) includes a broadband customer service module (B-CSM) (20). The B-CSM (20) includes a plurality of feeder interface cards (FICs) (36) and optical line cards (OLCs) (38) which are coupled together through a midplane assembly (34) so that each FIC (36) couples to all OLCs (38) and each OLC (38) couples to all FICs (36) through junctor groups (68). Within the B-CSM (20) circuit switching is performed electrically at an STS-1 rate. A reference clock which oscillates at a frequency slower than the data rate is routed with payload data so that it receives delays similar to those imposed on the payload data due to processing. At second stage switching fabrics (50) where data need to be extracted from signals flowing within the B-CSM (20), a clock regeneration circuit (32) generates a master clock signal oscillating at twice the data rate and phase synchronized to a delayed reference clock.

Abstract: An applications programming interface implements and manages isochronous and asynchronous data transfer operations between an application and a bus structure. During an asyncronous transfer the API includes the ability to transfer any amount of data between one or more local data buffers within the application and a range of addresses over the bus structure using one or more asynchronous transactions. An automatic transaction generator may be used to automatically generate the transactions necessary to complete the data transfer. The API also includes the ability to transfer data between the application and another node on the bus structure isochronously over a dedicated channel. During an isochronous data transfer, a buffer management scheme is used to manage a linked list of data buffer descriptors. This linked descriptor list can form a circular list of buffers and include a forward pointer to the next buffer in the list and a backward pointer to the previous buffer in the list for each buffer.

Abstract: A method and apparatus for setting up and executing trigger detection points that implement a previously unimplemented ETSI intelligent network capability set 1. Thus, the requirements of this ETSI intelligently networking standard are realized in a fast and innovative way in hardware and software.

Abstract: Methods and apparatus for enabling simultaneous transmission of voice and data signals over a single subscriber line. Signals are time division multiplexed preferably using an ISDN access format such as the Basic Access or Primary Rate formats, but are treated separately at the exchange. Subscriber equipment combines signals from local computer and telephone devices for separation at corresponding exchange equipment. Similarly the exchange equipment combines signals from one or more packet networks and the public telephone network for separation at the subscriber equipment. Data signals are therefore passed by the exchange directly to or from a packet switched network while voice signals are passed directly to or from a telephone switched network. Channels available over the subscriber line are dynamically allocated with telephone signals generally taking preference over data signals.

Abstract: A telephone network provided with an Internet connection and a call routing and control data base connected to the Internet is further provided with multiple geographically separated voice messaging systems connected to the Internet. Calls through the telephone network may be directed to such voice messaging systems or may be forwarded to such systems. Messages may be deposited in mailboxes in such voice messaging systems and then retrieved from telephone stations located sufficiently near the voice messaging systems as to entail no long distance or time toll charges. Return call service may be provided in a manner to avoid long distance or time telephone tolls through use of the Internet connected data base which routes calls which would incur a toll charge through the Internet.

Abstract: A universal digital communication device includes a first digital communications interface for a first type of digital communication signals (such as basic rate 2B1Q ISDN signals), and a second digital communications interface for a second type of digital communication signals (such as extended range 3B1O ISDN signals) having a digital transport range over a telecommunications network greater than that of the first type of digital communication signals. A processor-controlled multiplexer unit determines which of the two types of digital communication signals is required for providing digital communication connectivity between local and remote communications equipment. It then couples the terminal equipment to the telecommunications network by way the digital communications interface that is capable of interfacing the required digital communication signals with the telecommunication network.

Abstract: A device and process to allow remote receipt and placement of Internet Telephony connections (calls) using emulation of traditional POTS telephone service through a combination of software and a specialized cordless handset appliance. The system allows ringing and answering of inbound calls, dialing of outbound numbers, and signaling of handset status, as well as traditional telephony capabilities such as memory dialing, redial and radio channel controls. Voice control of dialing may also be implemented under software control. This system is easily adapted for operation with most PC based Internet Telephony software systems.

Abstract: A first sector cell is set as the object for measurement (S101). Reception levels in each time slot in the number of TDMA-TDD frames corresponding to the number of sector cells within the base station is measured for the object cell (S102). This measurement is performed for all the cells (S103 and S105). The results of the measurement of the reception levels of a specific sector cell are added to the results of the measurement of the reception levels of a sector cell opposite the specific sector cell, and time slots in which control channels can be placed are extracted for each sector cell (S106 to S108). TDMA-TDD frames are then allocated such that the control channels of each sector cell coincide with time slots in which control channels can be placed (S109). As a result, a control channel placement method is provided in which a TDMA-TDD mode is employed and in which control channels are placed in time slots such that a base station having a sector cell structure avoids interference from the same frequency.

Abstract: A method and protocol for creating R2 data connections over a telecommunications connection is presented. The protocol includes a small set of signals used to create a data connection over a telecommunications using R2-MFC signaling for voice connections. The method includes a first set of methods for R2-MFC short cycling and a second set of methods for R2-MFC spoofing. R2-MFC short cycling uses the R2 data connection protocol and a tone detection apparatus to create a data connection. R2-MFC spoofing uses the R2 data connection protocol to create a data connection without a tone detection apparatus to detect a forward register signal. The method and protocol allow a data connection to be quickly and economically completed using R2-MFC signaling. The method and protocol are suitable for data services such as Internet or intranet access and teleconferencing.

Abstract: In a synchronous multiplex network including a plurality of multiplex transmission apparatuses, an overhead is passed through intervening multiplex transmission apparatuses such that administration and maintenance operation information is transmitted and received through the overhead between arbitrary multiplex transmission apparatuses. The multiplex transmission apparatus receives a multiplexed signal comprising a payload having a plurality of main signals multiplexed therein and overhead bytes including a plurality of administration and maintenance operation information, performs termination processing for the administration and maintenance operation information and transmission processing for the payload, thereafter converts the multiplexed signal into a different multiplexed signal comprising a payload which has been processed for transmission and a plurality of administration and maintenance operation information, and transmits the different multiplexed signal.

Abstract: An open Services architecture for inter working narrow band services with equivalent broad band services delivers services on both the existing narrow band network and a future broad band network based on flexible signalling connections. The architecture incorporates an adaptive grooming router providing a fully interconnected backbone network function providing connectivity between a plurality of multimedia access routers and a narrow band network. The multimedia access routers provide hub points where access units terminating ISDN basic access and primary rate access lines used for multimedia services are terminated.

Abstract: A method of providing a control channel between first and second access terminals in a digital loop carrier, includes forming a pool of channels coupling the first and second terminals wherein each member of the pool can be assigned either to serve as the control channel or as a data channel. A member of the pool is dynamically assigned as the control channel. The control channel can be used to convey information regarding assignment of data channels to handle an incoming or outgoing call.

Abstract: Prior to communication over the Internet and using a different line, a first terminal transmits to a second terminal a set of information including at least an IP address of the first terminal on the Internet. Based on the IP address thus transmitted separately, the party at the second terminal initiates communication over the Internet. This establishes direct end-to-end communication between the two terminals over the Internet. In a communication setup such as an Internet-based telephone call wherein address information about a desired party on the network is not previously known to a calling party, the inventive method allows the two parties to communicate directly with each other over the network on an end-to-end communication basis without recourse to a rendezvous server or like services.

Abstract: A method and apparatus for processing digital audio data comprises remapping channel status information in an input digital audio bit stream into a uniform format. The channel status information in the uniform format contains a super-set of data included in the channel status block of the original data and comprises a “higher level” form of presentation than the original status information, thereby reducing the amount of processing required by the application program in interpreting the audio data. The translation of audio data between different formats is performed in an interface unit. The interface unit strips the channel status information from the incoming digital audio data, translates the channel status information into a desired form, and then presents the audio data and the translated channel status information to a host computer for further processing or storage. The translation and routing functions performed by the interface unit are controlled by data stored in one or more registers.

Abstract: A method for the common transmission of digital source and control data between data sources and sinks connected through data lines, includes transmitting the source and control data in a format prescribing a clocked sequence of individual bit groups of equal length. In each bit group, at least one bit position is reserved for the transmission of unformatted data. The unformatted data are allocated bitwise to the reserved bit positions of successive bit groups and are associated with a certain data source/data sink as a function of the control data.

Abstract: A method and apparatus for the efficient management of electronic communications in a ring topology network. Each Send packet and Echo packet includes a mechanism used to request to share bandwidth. In one implementation a single bit is used, while in another the mechanism includes a traffic control field providing a hierarchy of request to share bits accompanied by priority information, thereby enabling a multi-level system. When a Send packet reaches the target node the information is returned to the source node via the echo packet's request to share bit or the traffic control field, depending upon the implementation. The source node then alters its rate of packet transmission as a function of the number of requests to share it receives and, in the second implementation, as a function of the priority of the requesting nodes in relation to the priority of the source node. In one embodiment, each node conditionally gives output packets preference over passing through packets.

Abstract: A satellite direct radio broadcast system is provided which assembles bits of broadcast programs into prime rate increments, several of which are assembled into a frame. Frames are divided into symbols which are demultiplexed into alternating ones of a plurality of prime rate channels. The prime rate channels are demultiplexed onto a corresponding number of broadcast frequencies for transmission to a satellite. The satellite payload switches the symbols into time division multiplexed (TDM) data streams. The receivers process the TDM streams using service control headers (SCHs) provided therein by broadcast stations. The SCHs facilitate transmission of different service components within broadcast channel frames, association of a primary broadcast channel with one or more secondary broadcast channels on a frame-to-frame basis, and the transmission of multiframe bit streams, or auxiliary data throughout a broadcast channel that are independent of a service, in contiguous or non-contiguous frames.

Abstract: A system linking a serial interface with a processor that is parallel in nature is described. A system memory having a receive buffer stores data from a UART destined for processing by a central processing unit. A control state machine interrupts the central processing unit to initiate processing of the data in the receive buffer when the receive buffer reaches a certain state, such as storing a full frame of data. Command characters indicative of control conditions in the data stream are detected by discrete hardware in a receive command processor, and the memory address in the receive buffer is forwarded to the central processing unit. The resulting system substantially improves the speed and efficiency of the transfer of data between the UART and the central processing unit.

Abstract: The present invention includes a method, system, and apparatus for providing communication control. The invention includes a method in which signaling is processed externally to a switch before it is applied by the network elements. The processor is able to select network characteristics and signal the network elements based the selections. A network employing the processing method is also included, as well as a signaling system that employs the processing method.

Abstract: In a digital cable television system or a Hybrid-Fiber-Cable (HFC) system at least two control channels (104) of the out-of-band type are arranged to control the same upstream data transmission channel (107), whereby their capacity can be combined in order realize downstream data transmission in parallel with downstream high capacity data transmission. Applied in the DAVIC system the overhead bits (110a, 110b) of the SL-ESF frames (108a, 108b) of the co-ordinated control channels, and the R-bytes (R1a to R8c) of the SL-ESF payload indicating to which channel the control is directed, are made identical.

Abstract: A hub port in a hub of a loop network which automatically bypasses a node port which is generating a particular loop failure initialization sequence. The hub port contains a detection circuit which enables the hub port to detect loop failure initialization data received from its attached node port. Upon detecting such data from an attached node port, the hub port replaces such data with buffer data to be passed to the next hub port. Upon detecting the completion of a loop failure initialization sequence from an attached node port, the hub port enters a bypass mode. The hub port no longer passes on output from its attached node port and instead forwards along the internal hub link data received from the previous hub port in the hub loop. The bypass is maintained until the hub port receives a primitive sequence indicating the recovery of the attached node port. The hub port periodically sends at least one recovery sequence to the node port.

Abstract: According to the teachings of the present invention, a data path interface (16) for receiving an incoming signal (14) and facilitating an interface to a digital signal processor (18) includes a synchronizer (62) for determining a signaling frame in a processed signal received from the digital signal processor (18). The data path interface (16) also includes an idle code detector (76) operable to detect an idle code in the incoming signal (14) by comparing the incoming signal (14) to at least one user-programmable idle code pattern. The data path interface (16) further including a least significant bit detector (78) operable to detect a loss of information in the incoming signal (14) by monitoring the status of the least significant bit of each channel to determine whether that bit is stuck at a particular value.

Abstract: A method and system for processing a High level Data Link Control (HDLC) message despite the occurrence of a frame slip event in an Asynchronous Transfer Mode (ATM) receiver avoiding re-transmission of an HDLC message when a frame slip event occurs during reception of an HDLC message. In one embodiment, an ATM receiver receives an ATM cell, where the ATM cell carries one or more T1 payloads. Each T1 payload contains a plurality of timeslots, including an HDLC timeslot. The HDLC timeslot is read for each T1 payload prior to unloading each T1 payload from the ATM cell. The plurality of timeslots within each T1 payload are sent to a switch matrix, where the timeslots are de-multiplexed. The HDLC message is carried in the HDLC timeslot over a plurality of ATM cells and the HDLC message is processed despite the occurrence of a frame slip event.