Abstract: A system and method for a handshake protocol for digital subscriber line (DSL) and similar telecommunication systems that makes beneficial use of aliasing to select and decode signaling tones. In particular, the invention carefully selects signaling tones at frequencies such that higher frequency tones would alias down and coincide with specific base tones after sub-sampling. Thus, rather than filtering out higher frequencies to avoid aliasing, aliasing is exploited to use these higher frequencies. This technique would allow a receiver to detect and decode the higher frequency tones at lower frequency tone locations or bands. A related innovation is a band set, which includes one or more tones within a particular frequency band, where typically each tone in a band set corresponds to a different tone set.

Abstract: A system and method for managing resources in a distributed xDSL modem pool arrangement including a first number of front-end modules and a second number of back-end modules. In a preferred embodiment, when a back-end module identifies that its associated call session has entered idle-mode, idle-mode processing is performed in a manner which reduces processing load and electrical power consumption but does not result in a loss of synchronization or require retraining. A repetitively transmitted single modulated symbol transmitted from a user terminal device coupled to the modem pool indicates idle periods in user data. In the preferred embodiment, the modulated symbol to be transmitted is selected such that its spectral properties match those of user data modulated symbols.

Abstract: A system and method for allowing multiple digital subscriber line modems to access a telephone line. The embodiments employ additional signaling protocols to enable equipped modems to distinguish between initiating and responding signals from initiating customer premise modems and telephone company central office devices. The additional signaling can take many forms that can be detected and used to distinguished signals. Preferably, the signal is a stealth signal as to not interfere with existing communication devices. A variety of application and embodiments are disclosed to enable a solution allowing multiple modems to access a telephone line.

Abstract: The roof structure of a work vehicle cab is provided with a roof panel having a top surface exposed to the outside and a bottom surface facing the interior of the cab. A sound insulating foam liner is located under the roof panel and secured thereto by adhesives. The bottom surface of the foam liner is provided with ventilating channels. The ventilating channels have two sidewalls and a top wall extending between the sidewalls. A headliner is located below the foam liner and encloses the ventilating channels formed in the foam liner thereby forming ventilating ducts. A headliner mounting structure is also disclosed in which upstanding flanges around the perimeter of the headliner have slots that receive inward extending tabs on the frame to support the headliner.

Abstract: The operator's cab of a work vehicle is provided with a ROPS on which is mounted a roof structure. The roof structure is provided with a roof having a top surface exposed to the outside and a bottom surface facing the interior of the operator's compartment. A sound insulating foam liner having a top surface and a bottom surface is located under the roof. The top surface of the foam liner is secured to the bottom surface of the roof by adhesives. The bottom surface of the foam liner is provided with ventilating channels. The ventilating channels have two sidewalls and a top wall extending between the sidewalls. A headliner is located below the foam liner. The headliner has a top surface facing the bottom surface of the foam liner and a bottom surface facing the interior of the operator's compartment. The top surface of the headliner encloses the ventilating channels formed in the foam liner thereby forming ventilating ducts.

Abstract: The roof structure of a work vehicle cab is provided with a roof panel having a top surface exposed to the outside and a bottom surface facing the interior of the cab. A sound insulating foam liner is located under the roof panel and secured thereto by adhesives. The bottom surface of the foam liner is provided with ventilating channels. The ventilating channels have two sidewalls and a top wall extending between the sidewalls. A headliner is located below the foam liner and encloses the ventilating channels formed in the foam liner thereby forming ventilating ducts. A headliner mounting structure is also disclosed in which upstanding flanges around the perimeter of the headliner have slots that receive inward extending tabs on the frame to support the headliner.

Abstract: A protected lamp mounting assembly for an operator's cab roof of a work vehicle having a front edge, two side edges and two outwardly angled edges extending between the front edge and the exterior side edges. Two lamp housings are mounted to the side edges of the roof. The lamp housings are provided with a top plate corresponding to the roof and outwardly angled flanges corresponding to the outwardly angled edges of the roof, so that the roof and top plates and the outwardly extending edges and outwardly angled flanges provide a smooth transition between the roof and the lamp housings. The lamp housings are also provided with a mounting flange and a lamp mounting plate that extends downwardly from the top plate. The lamp housing is secured to the vehicle by the mounting flange. The lamp mounting plate in turn is provided with a lamp aperture having a specified perimeter that is smaller than the outer dimension of the lamp. The lamp is provided with a bulb portion and a rubber lamp deflector.

Abstract: A method and system for escaping from a fast retrain sequence in an ADSL system, particularly in a splitterless ADSL system. In one aspect of the invention, in order to minimize the impact of needing to complete nearly all of a fast retrain sequence, particularly when the sequence is unnecessary, the invention allows a responding transceiver unit to reply to a fast retrain request from an initiating transceiver unit with an “initialization” response. This response, not part of any standard ADSL fast retrain protocol, aborts a fast retrain sequence, and permits initialization to commence without the delay caused by waiting for completion of the fast retrain sequence. In another aspect of the invention, a fast retrain sequence is allowed to proceed up to a certain point, and then truncated by sending a command between a responding transceiver unit and an initiating transceiver unit.

Abstract: A system and method for generating and repetitively transmitting a single modulated symbol during idle periods in user data in a digital subscriber line (DSL) communication system. The modulated symbol to be transmitted is selected such that its spectral properties match those of user data modulated symbols. For an asynchronous DSL system, and variants thereof, a preferred idle symbol is the "superframe" synchronization symbol. A separate modulated symbol would indicate the end of the idle state. In the preferred embodiment, the end-of-idle symbol is the idle symbol shifted by a 180.degree. phase shift. In a preferred embodiment, the transmitter in a DSL modem would calculate the idle state modulated symbol once at the start of the idle period and then simply repeat this symbol until the end of the idle period, in which case the transmitter would invert the final idle symbol. At the receiver, an idle state modulated symbol detector and phase detector are implemented.