Abstract: A state machine that allows an audible alarm for a given fault condition to be extinguished while allowing subsequent audible alarms for different fault conditions.

Abstract: A line card circuit using a pair of comparators such that the output of the first comparator is coupled to an input of the second comparator through an RC circuit. The RC circuit is tuned such that short transients, such as false pulses and false off hook indications passed by the first comparator are not passed by the RC circuit to the second comparator. The input of the first comparator is coupled to the subscriber line and the output of the second comparator is coupled to the switch's hook status detection circuitry.

Abstract: A PCB scrap edge removal tool comprising scrap removal jaws formed of two matching opposing pieces of metal having cut-outs in a castellated fashion. The jaws have a gap between them for receiving a PCB work piece to be finished. Metal dowels for PCB positioning span the gap. A PCB is positioned in the gap and rocked back and forth to break off the scrap edge pieces. The cut-outs in the scrap removal jaws correspond to portions of the PCB edge that are not to be removed. These portions move freely in the cut-outs as the PCB is rocked back and forth.

Abstract: In processing of VoIP calls, a called facility, prior to the cut through of ringing that would alert personnel to the presence of an incoming call, transmits previously stored information that identifies the persons at the called facility that are authorized to handle particular types of calls. In response to the receipt of caller-ID information, the called facility queries a database to determine whether (a) the caller is known and, if so, whether there are particular call handling instructions stored for this caller; and (b) whether the called facility is classified as blocked from participating in called party identification service. If the database response indicates that the called facility participates in called party identification service, the data base sends to the caller, before the call is answered, a list of persons at the called facility who are authorized to answer the call and, advantageously, some indication of what that persons area of responsibility may be.

Abstract: A connector protection bracket that mounts to the rear of an electronic assembly, having a flange extending away from the electronic assembly to protect the connector such that should the rear of the assembly drop upon removal from a shelf, the flange, rather than the connector, will strike the shelf.

Abstract: A system for cooling an electrical chassis in which two separate zones are formed within the chassis by horizontal separators forming an internal floor and a ceiling, and a mid-located backplane acting as a vertical separator, spanning from floor to ceiling. Air flow volume through the zones is controlled separately through the use of separate air intake filters that may have different filter densities and sizes, and appropriate fan pack size.

Abstract: An addition to AIN that allows SSP triggers to jump to internal SSP addresses for feature processing without a return. There is no query sent to an SCP nor the associated response message, call processing is not suspended, and there is no need for fault handling associated with the trigger.

Abstract: A system and method for capturing and modifying roaming mobile subscriber information such as Serving MSCID, cell and sector location information, original dialed digits, subscriber profile and return address point code in support of service applications, such as wireless prepaid service for roaming subscribers. A network platform is inserted into the signaling path between a roaming subscriber's HLR and all Serving MSCs. The network platform intercepts messages exchanged between the roaming subscriber's Serving MSC and HLR, and extracts and stores information such as Serving MSCID, cell and sector data. The network platform may also modify the exchanged messages in support of service applications.

Abstract: A system in which centralized announcement platforms are connected to host switches over dedicated trunks, and remote switches needing announcement services send a signaling message to a host switch requesting a connection to the announcement platform. A connection is then established between the host switch and the remote switch over a regular trunk, and the full connection is completed over a dedicated circuit between the host switch and the announcement platform. Announcement message ID and other information required by the announcement platform is coded in the available parameter fields of a signaling message. Less total circuits are required and redundancy is provided.

Abstract: A system for programming field programmable devices (FPDs) of different types across different boards. An in-system programmable master (ISPM) communicates over a bus to in-system programmable slaves (ISPSs) on one or more boards. FPDs on each board are connected into chains of the same type, and each chain is connected to an ISPS located on the board. The ISPM uses a packet protocol to communicate with all ISPSs in a system. Each packet comprises an ISPS address field, a chain select field, and a command field. Each ISPS reads packets addressed to it, and decodes and transmits the commands to the selected FPD chain in a protocol appropriate to the chain.

Abstract: A backplane support bracket comprising a flange with opposing engaging tabs extending downward, and a flange extension arm with a connecting tab also extending downward. The opposing engaging tabs and flange fit over a frame module support cross-member in close fit, and the connecting tab is secured to a cable connector of a connector bank using a cable connector mounting screw located along a backplane edge strip of a cutout. With one or more backplane support brackets so installed, the bracket greatly reduces flexing of the cutout edge strip when cables are inserted and removed from the cable connector bank and circuit cards are inserted into the backplane.

Abstract: A backplane slot configuration and a bridge card for expanding the expansion slots of one system to include the expansion slots of an adjacent electrically separate system within the same cabinet, and bridging the expansion buses with minimal change of electrical characteristics, particularly impedance, across the bridge. Adjacent end slots are spaced apart according to the relevant specification, and each slot set is configured so that the backplane expansion buses span contiguous slots and the expansion buses include the adjacent end slot.

Abstract: A method and system in an ISDN network for exchanging call control information between a switch and an IP, and for call set-up and call clearing for intermediate access to an IP. The invention utilizes the User-User Information (UUI) element of the Q.931 messages to exchange call information between a switch and an IP. A subscriber call results in a connection being established to an IP. A request to the IP is encoded in the UUI element of a SETUP message, and call routing information is encoded in the UUI element of a returned DISCONNECT message. The DISCONNECT message causes a partial call release of only the circuit segments from the IP back to the switch. The circuit segments from the calling party to the switch are maintained. The switch then routes the user call to a final destination based on information contained in the UUI element of the DISCONNECT message.

Abstract: A line card circuit to prevent false off-hook signals resulting from the permanent loss of battery voltage at a line card. In the battery present condition, the 5V operating voltage is connected to the collector lead of an NPN transistor, which also supplies the output signal of the system. The emitter lead of the transistor is connected to ground. The -48V battery voltage is connected to the transistor base lead and biases the base negative with respect to the emitter, maintaining the 5V logic "1" output signal on the collector lead. There is a resistor and capacitor in series, forming an RC circuit, across the 5V collector lead and the -48V base lead. In the battery present condition, there is a significant charge across the capacitor. In the battery absent condition, the -48V battery voltage is lost and the voltage on the base lead rises to a positive voltage in a time interval governed by the discharge time of the RC circuit, thus causing the system output signal to drop to logic "0".

Abstract: A SCP connected to a switch through an ISUP loop-back trunk redirects a dialed call to an intermediate destination. After the intermediate destination releases the call, all circuit segments from the intermediate destination back through and including the inbound (to the MSC) side of the loop-back trunk are cleared. The SCP then establishes a connection through the inbound leg of the loop-back trunk to the dialed destination. The SCP remains in the circuit for the duration, including all intermediate call completions as well as the call to the dialed destination. When the call to the dialed destination is complete, the entire connection is released per standard ISUP procedures.

Abstract: A computer integrated telephony system embodied in a PC that includes a telephony interface connected to the local loop that detects whether one or more extension phones are off-hook by using the signal generating and detection capabilities found on a typical telephony interface card. In the preferred embodiment, the telephony interface is based on a programmable DSP that generates and injects onto the local loop a subsonic signal having a known shape and amplitude. If one or more extensions are off-hook, the amplitude of the subsonic signal detected on the line will be significantly attenuated. The amplitude of the detected signal is compared against a threshold value and an indication is made if the detected signal amplitude is below the threshold value.

Abstract: A tone detector for detecting a multi-tone input signal in the presence of speech and noise, comprising first signal processors that generate output signals indicating the energy level of the input signal with the frequency of one of the component tones being amplified and the frequencies of all other of the component tones being attenuated, a last signal processor that generates an output signal indicating the energy level multiplied by negative one of the input signal with the frequencies of all component tones being attenuated, summing junctions that generate output signals indicating the energy levels of the sum of one of the first signal processor output signals and the last signal processor output signal, and tone validation logic receiving the summing junction output signals that generates a tone detect signal when the summing junction output signals indicate that the component tones satisfy a signaling standard.