Abstract: A method for data security policy enforcement including inspecting incoming and outgoing data packets from a server computing device for attributes in accordance with a data security policy, processing the data packets in accordance with the security policy based on the inspected attributes, and routing the data packets in accordance with the security policy based on the inspected attributes, wherein incoming and outgoing data from the server computing device composed of the data packets is processed and routed in accordance with the security policy on a per-packet basis. A system and computer program product is also provided.

Abstract: A base station, for use in a wireless communication system, includes a report receiving unit operable to receive from a user equipment of the system a report of a downlink received signal quality produced by the user equipment. The report receiving unit includes a unit operable to receive a report of a measuring received signal quality or a report of a selected modulation and coding scheme to the transmitter.

Abstract: A network switch configures a static forwarding to a packet processor by suppressing packet switching and forwards all traffic received on a group of ports a trunk port for aggregation. A trunk header is overloaded with message classification information for use at the downstream packet processor. Routing logic retrieves the packet classification information and stores the information in control fields that are ignored due to the static forwarding and local switching disablement. The static forwarding forwards the packet, with the appended classification information, to a packet processor via the aggregation port. Packet classification information is indicative of the type of the message traffic and is performed upon packet arrival at the switching device.

Abstract: A distributed switching fabric system includes multiple network switches coupled to a cell-based switching fabric by cell-fabric ports. A virtual machine runs on a server connected to a network port of one or more of the network switches that are members of a given switching domain. The virtual machine manages a control plane for the given switching domain. The server receives a protocol control packet from one of the network switches and forwards the received protocol control packet to the virtual machine for processing.

Abstract: According to one example of the present invention, there is provided a method of routing data packets to a plurality of packet processors in a computer network. The method comprising obtaining workload data from the packet processors, determining a workload distribution across the packet processors, and updating a balancing table used by a switching element in the network based on the determined workload.

Abstract: A reduced size multiplexer and, in particular, a reduced size optical signal multiplexer module is provided for use in a reduced size enclosure. The optical signal multiplexer module has electrical and optical connectors on its faceplate to provide ease in access without having to remove the optical signal multiplexer from the enclosure. The optical signal multiplexer circuit is configured in a standard Type 400 mechanics circuit board arrangement. The optical signal multiplexer module therefore can be inserted into an enclosure in a direction opposite to that in which the DS1 or DS3 connector projects from the face plate, so that the DS1 or DS3 connector remains freely accessible outside of the enclosure when the optical signal multiplexer module is fully loaded into the enclosure. DS1 and DS3 cables and optical fibers can thus be easily coupled to the DS1 and DS3 and optical connectors, respectively, when the SONET multiplexer circuit is fully loaded into the enclosure.

Abstract: An audio network system that performs transport of audio signals between nodes by cascading a plurality of nodes each including two sets of transmission I/Fs and reception I/Fs, and circulating among the nodes in each fixed period an audio transport frame generated by a master node, the audio transport frame including a plurality of storage regions for audio signals, is configured such that when the configuration of the system is changed, loopback of the audio transport frame in each node and release thereof are automatically controlled to automatically loop back the transport of the audio transport frame at nodes at both ends and not loop back it at the other nodes to thereby form a loop transmission route among the nodes.

Abstract: A backbone network, comprising a first switch comprising a first port configured to communicate a data stream via an Ethernet interface, and a second port configured to communicate the data stream via a SONET/SDH interface, and a second switch comprising a third port configured to receive the data stream from the first switch via the Ethernet interface, wherein the first switch and the second switch are synchronized.

Abstract: Embodiments of the present invention disclose a method for binding transmission lines and the method includes the following steps: first decide a transmission speed supported by all the transmission lines to be bound, activate all the transmission lines to be bound at the transmission speed supported by all the transmission lines and then bind all the transmission lines. Apparatus for binding transmission lines is also disclosed in the embodiments, which includes a speed reselecting module, a reactivating module and a binding module. According to the embodiments of the present invention, transmission lines with different transmission speeds are bound together in such a way that transmission lines with different transmission speeds could be activated at one transmission speed. Therefore, the bound transmission line may provide wider bandwidth for the user because all the bound transmission lines have the same transmission speed.

Abstract: A system and method are provided for more effectively utilizing modems in a WiMAX environment, so as to improve network connectivity while providing access for both fixed as well as portable computing devices. The apparatus connects one or more computing devices to a network-based information system through at least a first WiMAX modem that is located within the apparatus. A second WiMAX modem can be removably coupled to the apparatus so as to improve network connectivity and operability. In the event, the second WiMAX modem is removed and coupled to a portable computing device, network connectivity provided by the first WiMAX modem is maintained.

Abstract: A voice over internet protocol telephone system is described in which services for handling calls invoking account codes are distributed to voicemail servers in the system. If the voicemail server associated with a particular user does not have services for handling account code calls, then the request is forwarded to another voicemail server in accordance with a predefined procedure.

Abstract: A one-dimensional circulating switch may be defined by connections between several switch modules and one or more temporal cyclic rotators. Where a switch module that is part of a first one-dimensional circulating switch is also connected one or more temporal cyclic rotators that define a second one-dimensional circulating switch, a two-dimensional circulating switch is formed. A two-dimensional circulating switch is flexible and may scale to capacities ranging from a few gigabits per second to multiple Petabits per second.

Abstract: A system, method and node for rate policing of bearers in a network. The method includes the steps of associating individual bearers from a first plurality of bearers with a first bit rate limit and a maximum bit rate, MBR, setting a load level for the first plurality of bearers in the communication network, determining an actual load in the communication network, wherein the actual load depends on the first plurality of bearers, and determining if the actual load is below the set load level. If the actual load is below the set load level the individual bearers from said first plurality of bearers are policed based on the associated MBR for the individual bearers. Else policing of the individual bearers is based on the first limit for the bit rate associated with the individual bearers.

Abstract: A multi-port memory, comprising: a memory array made of a plurality of memory cells arranged at intersection points between a plurality of bit lines and a plurality of word lines, the memory array being divided into n (an integer of 2 or greater) memory banks; m (an integer of 2 or greater) input/output ports, each independently performing input and output of a command, an address, data to and from each of the memory banks; and a route switching circuit that sets signal for the command, address, and data between the memory banks and the input/output ports, the route switching circuit controlling a connection state of signal lines between the plurality of input/output ports and the plurality of memory banks.

Abstract: Methods, systems, apparatus including computer program products having instructions for porting numbers are provided. In one example system and method, a vPBX system can receive a request from a user to port an existing phone number to the vPBX system. The vPBX server can identify a porting authentication template, based on the requirements of an existing service provider. The vPBX server generate a fax document on the retrieved template. The vPBX server can populate the generated fax document with user information. The vPBX server can receive a user's hand signature from a touch-screen interface of a mobile device. The vPBX server can authenticate the fax document with the received signature, and transmit the authenticated fax document to the existing service provider. The vPBX server can provide the user with a temporary line number with forwarding functions until porting is completed.

Abstract: Described is a system comprising a first wireless device and a second wireless device. The first device has access to a packet routing table which includes data indicative of a packet transmission path in a wireless mesh communications network. The second wireless device is communicatively coupled to the first device and has access to the routing table. Upon receipt of a packet by the first device which is addressed to the second device, the first device determines, as a function of at least one of (i) the routing table and (ii) a first identifier of the second device, a second identifier of a third wireless device to receive the packet directly from the first device. At least one of the first, second and third devices updates the routing table.

Abstract: The present invention provides the capability to manage NEs with a large number of units of equipment and facilities, by providing functions such profiling, auto-creation, link aggregation and scoping. This makes it easier for to manage GPON data, voice and video services and to support traffic protection. A method for managing an optical network comprises automatically provisioning a unit of the optical network, automatically creating a unit of the optical network, and arranging link aggregation in a unit of the optical network.

Abstract: A system for the end-to-end delivery of digital television signals. In a preferred embodiment a digital television signal is: received from production equipment, typically in HD format at approximately 1.4 gigabits per second (Gbps); the received signal is transmitted to a venue point-of-presence; converted for transmission via a 270 Mbps local loop; transmitted to a fiber network point of presence/video service edge; packetized into TCP/IP packets in a video gateway; and routed to one or more destination addresses via the fiber network; received at one or more video service edge destinations; converted to a digital television format, typically SDI; and either transmitted via a second 270 Mbps local loop for delivery to a customer site and subsequent conversion to a 1.4 Gbps HD signal, or converted directly to a 1.4 Gbs HD signal at the receiving video service edge.

Abstract: Aspects of a method and system for duty cycling a network port based on duty cycling of a link communicatively coupled to the port are provided. In this regard, in a network node communicatively coupled to a network link which operates at a plurality of data rates, one or more components of said network node may be cycled through a series of configurations, where a processing capacity and/or a duration of each configuration may be based on the plurality of data rates on the network link. Exemplary components of the node may comprise one or more hybrids, transmitters, receivers, processors, and/or memory elements. The components may be cycled through the series of configurations during each of a series of time intervals. The series of configurations may be based on one or more of a type of data communicated over said network link and an application running on said network node.

Abstract: One object of the present invention is a method for the support of high bit rate services in a mobile communication system, said method comprising a step wherein a network entity signals to a Mobile Station, according to signalling procedures used in case of access via a broadband Access Network, at least one bit rate higher than the maximum bit rate specified in case of access via a non broadband Access Network, based on bit rates as defined according to signalling procedures used in case of access via said non broadband Access Network.

Abstract: The present invention provides the capability to manage NEs with a large number of units of equipment and facilities, by providing functions such profiling, auto-creation, link aggregation and scoping. This makes it easier for to manage GPON data, voice and video services and to support traffic protection. A method for managing an optical network comprises automatically provisioning a unit of the optical network, automatically creating a unit of the optical network, and arranging link aggregation in a unit of the optical network.

Abstract: A network device and a method for its operation are disclosed. The network device has a first interface to a client device to allow reception of client device signals and a second interface to a packet network to allow transmission and reception of modem relay signals. A processor translates between modem relay signals received or transmitted on the second interface and client device signals received or transmitted on the first interface. In one implementation the modem relay originator and the client device are collapsed into one device and the first interface is implemented as a virtual interface.

Abstract: A method of scheduling time division duplex frames at a base station in a time division duplex system is provided. The method includes determining if the round-trip propagation delay between the base station and a communicatively coupled subscriber station is greater than the difference between the base station turn-around time and the minimum allowed subscriber station turn-around time, and modifying time slots in a time division duplex frame being sent to the subscriber station over a communication link to extend the range of signals sent from the base station.

Abstract: Methods, systems, and computer program products for firewall policy optimization are disclosed. According to one method, a firewall policy including an ordered list of firewall rules is defined. For each rule, a probability indicating a likelihood of receiving a packet matching the rule is determined. The rules are sorted in order of non-increasing probability in a manner that preserves the firewall policy.

Abstract: A reduced size multiplexer and, in particular, a reduced size SONET multiplexer module is provided for use in a reduced size enclosure. The SONET multiplexer module has electrical and optical connectors on its faceplate to provide ease in access without having to remove the SONET multiplexer from the enclosure. The SONET multiplexer circuit is configured in a standard Type 400 mechanics circuit board arrangement. The SONET multiplexer module therefore can be inserted into an enclosure in a direction opposite to that in which the DS1 or DS3 connector projects from the face plate, so that the DS1 or DS3 connector remains freely accessible outside of the enclosure when the SONET multiplexer module is fully loaded into the enclosure. DS1 and DS3 cables and optical fibers can thus be easily coupled to the DS1 and DS3 and optical connectors, respectively, when the SONET multiplexer circuit is fully loaded into the enclosure.

Abstract: A system and method of automating the validation and control of peripheral director hardware in a switched fabric network. A system is provided that includes a script language processor for interpreting high-level statements and generating command functions understood by an application programming interface (API) associated with the switched fabric network, wherein the command functions include a query switch command, a query interface switch command, a write switch command, and a display result command; and a system for generating an output in response to a set of command functions submitted to the switched fabric network.

Abstract: A network control apparatus and network control method is provided. The network control apparatus including: a content addressable memory receiving to store a plurality of addresses which are generated by at least one master intellectual property, determining whether data corresponding to each of the plurality of stored addresses is received, and generating a determination signal; and a packet decoder transmitting each of the plurality of stored addresses and the data corresponding to each of the plurality of stored addresses to a slave intellectual property according to the determination signal. Accordingly, a multiple address issue function can be supported.

Abstract: A communications module including an electrical interface for operatively connecting the communications module to an electric device is disclosed. The electric interface enables data communication between the communications module and the electric device in either a serial mode or parallel mode. The communications module includes: one or more electrical connectors arranged in the electric interface, a Dual Port RAM is connected to the electrical interface for providing parallel transfer of data through the electrical interface, and a control unit connected to at least one of the one or more electrical connectors, wherein the control unit is adapted to determine the value of one or more signals applied on the at least one of the one or more electrical connectors and enable either serial or parallel data communication through the electrical interface depending on the value of the one or more signals.

Abstract: A multicast transmission scheme is introduced. A multicast data stream is sent on a default tunnel and switched to a data tunnel during flooding conditions. The default tunnel is a point-to-multipoint tunnel from, for example, a source provider edge router to all other provider edge routers in a virtual private network. The data tunnel is a point-to-multipoint tunnel from, for example, a source provider edge router to other provider edge routers that have recipients. Flooding conditions can occur when sending the multicast data stream on the default tunnel, for example, when a specified bandwidth threshold has been exceeded on a source provider edge router. Additionally, the data tunnel is created by selecting a multicast distribution tunnel group from a configured pool of addresses, advertising the group, receiving data joins from, for example, provider edge routers with recipients, and waiting a specified send time.

Abstract: The present invention discloses a method and Ethernet device for clock synchronization, a method for clock synchronization in an entire Ethernet, and the relevant Ethernet. The method for clock synchronization in an Ethernet device includes: the PHY layer unit of the Ethernet device extracts a clock from the data sent by the receive unit; the MAC layer unit makes adjustments to the extracted clock according to the local clock and takes the adjusted clock as the transmit clock of the Ethernet device. The method for clock synchronization in an entire Ethernet includes: clocks of all Ethernet devices are synchronized to the clock generated by the Ethernet device at the highest level. The invention provides a method for clock synchronization so that sending and receiving of clocks in Ethernet devices can be synchronized and clock synchronization can be realized in the entire Ethernet.

Abstract: A shared memory is described having a plurality of receive ports and a plurality of transmit ports characterized by a first data rate. A memory includes a plurality of memory banks organized in rows and columns. Operation of the memory array is characterized by a second data rate. Non-blocking receive crossbar circuitry is operable to connect any of the receive ports with any of the memory banks. Non-blocking transmit crossbar circuitry is operable to connect any of the memory banks with any of the transmit ports. Buffering is operable to decouple operation of the receive and transmit ports at the first data rate from operation of the memory array at the second data rate. Scheduling circuitry is operable to control interaction of the ports, crossbar circuitry, and memory array to effect storage and retrieval of the data segments in the shared memory.

Abstract: Variable length switch fabric for switching variable length data packets between input and output transmission paths in a communication network. In one embodiment of the invention, apparatus is provided for switching variable length data packets between input and output transmission paths in a communication network. The apparatus includes a plurality of input ports coupled to receive the plurality of variable length data packets from the input transmission paths and a plurality of output ports coupled to transmit the plurality of variable length data packets on the output transmission paths. The apparatus also includes a variable length switch fabric coupled to the plurality of input ports and the plurality of output ports, the variable length switch fabric operates to switch the plurality of variable length data packets from selected input ports to selected output ports in an unsegmented form.

Abstract: A method for configuring a link aggregation module, including configuring the link aggregation module to use an initial network interface card (NIC) selection algorithm, servicing a first plurality of packets using a plurality of NICs in an aggregation group, wherein the initial NIC selection algorithm is used to select the one of the plurality of NICs to service at least one of the first plurality of packets, collecting a plurality of first packet distribution statistics for the aggregation group corresponding to the servicing of the first plurality of packets, and selecting a first alternate NIC selection algorithm based on the plurality of first packet distribution statistics.

Abstract: A network device for handling data and a method for handling data in a network device are disclosed. The network device includes at least one media port and at least one high speed docking station, communicating with the at least one media port. At least one master is provided in the network device, where the at least one master is connected to the at least one high speed docking station. The master is configured to handle and process data received by the at least one media port and passed to the master through the at least one high speed docking station. The network device is configured to handle media ports of different media types. Thus, the device can handle data received through different media ports that have different media types with the same master, making the network device easily configured to meet a customer's needs.

Abstract: An apparatus is provided for allocating a transmission period in a wireless network system. An access point (AP) transmits a PSMP frame indicating a downlink period and an uplink period allocated to each station (STA), and at least one sub PSMP frame indicating an allocated downlink period for at least one of a retransmission of downlink data and a transmission of an ACK indicating successful receipt of uplink data. After exchanging data with the AP in the downlink and uplink periods indicated by the PSMP frame, an STA receives the each sub PSMP frame, and performs at least one of a reception of the retransmitted downlink data and a reception of the ACK in the downlink period indicated by the each sub MAP frame.

Abstract: An integrated circuit device for use in a node of a communication system is provided. The integrated circuit device includes a memory configured to store data written thereto by a receiver associated with the node in accordance with a receiver clock, and to read data therefrom by a transmitter associated with the node in accordance with a transmitter clock. The integrated circuit device also includes a control logic circuit that is in communication with the memory, and is configured to send a control signal to the transmitter to adjust a speed of the transmitter clock responsive to an operating condition of the memory.

Abstract: A method and system are provided for transferring data in a networked system between a local memory in a local system and a remote memory in a remote system. A RDMA request is received and a first buffer region is associated with a first transfer operation. The system determines whether a size of the first buffer region exceeds a maximum transfer size of the networked system. Portions of the second buffer region may be associated with the first transfer operation based on the determination of the size of the first buffer region. The system subsequently performs the first transfer operation.

Abstract: The invention relates to a method for transmitting compression parameters in a mobile communication system, comprising a mobile node, a first and a second packet switching node. In the method the second packet switching node is informed of the entry of the mobile node to an area controlled by the second packet switching node. At least one compression parameter is received from the first packet switching node to the second packet switching node. The second packet switching node informs at least one of the at least one compression parameter to the mobile node by way of layer-3 parameter renegotiation for a logical link connection. The benefits of the invention are related to improved reliability of packet data transmission to and from a mobile node.

Abstract: A system acquires information about communication among wired or wireless nodes [110, 210] in a network [100, 200] by intercepting chunks of data in the network by a wired or wireless tap [120, 220] located among the wired or wireless nodes [110, 210] in the network. Characteristic information [400] about the intercepted chunks of data may be obtained. The characteristic information may include times of arrival [410] of the chunks of data at the wired or wireless tap [120, 220] and identifiers of wired or wireless source nodes [420] that sent the chunks of data. At least one signal may be constructed to represent the characteristic information over time.

Abstract: A method and system provide for using a single broadband SS7 signaling gateway for multiple wireless access gateways. One embodiment may have the steps of: forming a cluster of media gateways, each of the media gateways having a respective transcoder; providing at least one first media gateway of the cluster of media gateways having an integrated broadband SS7 signaling gateway, at least one second media gateway of the cluster of media gateways being without an integrated broadband SS7 signaling gateway; and using the at least one first media gateway for SS7 signaling and using the at least one second gateway for resources other than SS7 signaling.

Abstract: A control unit produces a packet signal composed of a plurality of streams, based on a plurality of inputted data signals. For each of a plurality of data signals, a baseband processing unit multiplies the produced packet signal by a weight vector. The control unit appends a common known signal to a header portion of a plurality of data signals, and appends a dedicated known signal to a front part preceding a data signal by which a dedicated weight vector is to be multiplied, in the plurality of data signals. Of the produced packet signal, the baseband processing unit multiplies the dedicated known signal and a data signal assigned posterior to this dedicated known signal by the dedicated weight vector, and of the produced packet signal it multiplies a part by which no dedicated weight vector is to be multiplied, by a common weight vector.

Abstract: A method of dealing equitably with traffic from multiple VPNs feeding into a single router utilizes the weighted fair queueing (WFQ) technique of the prior art in combination with a “service level” queue comprising a set of tokens defining the class of service (COS) with the next packet to be transmitted and a queue selector that functions to query each queue in a round robin fashion. The service level queue ensures that the higher priority traffic will be transmitted first, while the queue selector ensures that each VPN will receive similar service. The queue selector may be “weighted” in that if a particular VPN generates substantially more traffic than the other VPNS, that VPN will be selected more than once during a round robin cycle to transmit a packet (“weighted round robin” WFQ).

Abstract: An alarm indication translation mechanism in a digital access and cross-connect system monitors all incoming tributary DS1 streams for the presence of an alarm indication. Whenever an alarm indication is detected in a fractional tributary DS1 data stream, all DS0 bytes within the T1 stream containing that tributary DS1 data stream include the detected alarm indication. For a Yellow alarm, this means that for the case of D4 superframe format (SF), the second most significant bit of each of the twenty-four bytes of a T1 frame containing at least one fractional DS1 carrying alarm information is set to a ‘0’, irrespective of whether the bytes are valid DS0s or idle bytes. For extended superframe format (ESF), Yellow alarm is transmitted by sending a repetitive sixteen bit pattern consisting of eight marks or ‘1’s, followed by eight spaces or ‘0’s in the data link.

Abstract: A computer network as described herein includes multiple wireless switches cooperating with wireless access devices. The wireless access devices include intelligent processing that enables them to select a desired wireless switch for adoption. When in need of adoption, a wireless access device sends at least one SWITCH DISCOVER message over the network, the wireless switches reply with SWITCH OFFER messages, and the wireless access device processes the SWITCH OFFER messages to select a desired wireless switch for adoption. The SWITCH OFFER messages contain switch selection information associated with the respective wireless switches, and the wireless access device analyzes the switch selection information during the selection process.

Abstract: A method and apparatus for improved operation of a packet network by controllably providing switched physical alternate links between packet network nodes, at least one of which is a host, and using those switched physical alternate links to supplement the capacity of the packet network. A switched physical alternate link is composed of physical elements, switchable connection devices, and a manager, such that a switched physical alternate link behaves as a single point-to-point physical link between nodes in a packet network. Creating and removing switched physical alternate links as the packet network operates provides supplemental carrying capacity between the packet network nodes connected by switched physical alternate links, while overall packet network congestion is simultaneously reduced.

Abstract: A network device for handling data and a method for handling data in a network device includes at least one media port and at least one high speed docking station, communicating with the at least one media port. At least one master is provided in the network device, where the at least one master is connected to the at least one high speed docking station. The master is configured to handle and process data received by the at least one media port and passed to the master through the at least one high speed docking station. The network device is configured to handle media ports of different media types. Thus, the device can handle data received through different media ports that have different media types with the same master, making the network device easily configured to meet a customer's needs.

Abstract: A normal audio communication terminal can use the VoIP technology in a mobile communications system by using an audio communication circuit for a conventional wireless circuit, and adding an audio communications function to a packet communication device. In a PS (packet switching) network side forming a core network in the mobile communications system, the signaling of a CS (circuit switching) call with an RNC is designed to control a CS-UP (CS side user plane) by communications with the CPU of an SGSN, and the user data relating to a CS call is designed for communications with a PSTN (public switch telephone network) by way of an MGW through the CS-UP. Thus, an audio communication function can be added to a packet communication device, thereby realizing a VoIP function to a wireless circuit using an audio communications circuit.

Abstract: An asynchronous data transmission device includes a data reception terminal receiving data clocked by a sampling signal in synchronization with a local clock signal. A register is connected to the data reception terminal for receiving the data. A clock deviation measuring circuit is connected to the register for determining a number M of periods of the sampling signal appearing during K periods of a synchronization signal received on the data reception terminal, and for comparing the number M to a tolerance margin defined by a lower threshold and an upper threshold.

Abstract: Conditional selection adders include first and second signal generators and a summation circuit. The first signal generator is configured to generate a carry generation signal and a carry propagation signal in response to a pair of operands to be added. The second signal generator is configured to generate a carry input signal and a block carry signal in response to the carry generation signal and the carry propagation signal. This second signal generator includes a plurality of groups of leaf-cells arranged in ascending order from a first group containing the fewest number of leaf-cells to a second group containing a largest number of leaf-cells. The summation circuit is configured to generate a sum of the pair of operands in response to the block carry signal, the carry propagation signal and the carry input signal. The summation circuit may include a group bypass circuit and a summation unit.

Abstract: Disclosed is a circuit and method for reducing control code transmission between a line card and a switching fabric. One embodiment includes a memory receiving (and storing) data transmitted at a second rate during a first period of time. A quantity of data in the memory at time t, q(t), is compared with first, second, third, and fourth quantity values. The memory may receive data transmitted at the first rate if q(t) is less than the second, third and fourth values but greater than the first value. The memory may receive data transmitted at the third rate if q(t) is greater than the first, second, and third values but less than the fourth value. The memory may receive data transmitted at the second rate if q(t) is greater than the first and second values but less than the third and fourth values.