A more effective discard mechanism for Selective Repeat ARQ is achievable, where the discard mechanism exhibits a sender-initiated discard signaling scheme. The discard mechanism is also more effective where it takes into consideration the segmentation and reassembly of upper layer data packets, if such is being employed, and where it is able to notify the receiver when data units have been discarded at the sender, regardless whether explicit discard signaling from the sender to the receiver is ...

The invention comprises a channel repeat attachment for a tape unit of the type comprising a housing having an opening therethrough for receipt of the channel-change electrodes of a playback device, and a multi-channel tape mounted in the housing for movement past the opening, the tape having a channel-change key portion thereon. The attachment comprises a shield adapted to be disposed in an operative position in alignment with the opening and overlying the tape to separate the tape from the cha...

A step-and-repeat registration system is disclosed for making multiple-image plates for use in flexographic printers or the like. The negative which carries the image to be transferred to a light-sensitive film, is referenced with respect to a fixed frame. An incremental step registration system accurately positions the film at a succession of predetermined stations to bring different portions of the film opposite the negative. At each station the film is brought into contact with the negative a...

Apparatus for moving sheet material, primarily microfiche, into a plurality of X and Y axis positions by means of a gas cushion formed on a plate in which the sheet material is shifted by means of ducted gas jets or sweeps; location of the sheet material is achieved by means of movable stops, sweeps or sensors; the stops are controlled by electromagnets or pneumatic means; a feed device is provided in one example to feed the sheet material onto the gas cushion and to enable removal of the sheet ...

The invention comprises a step and repeat board having an upper surface with oriented peaks and valleys, the valleys intersecting one another to form a texture or finish constituting a level hair-line cell structure wherein the valleys preferably have an average depth on the order of 0.003 to 0.004 inches.

A time switch comprises a scale plate which is rotated at a constant velocity and change-over pawls and a cradle. In the time switch the change-over pawls respectively have each flexible thin body part and are projected outwardly from an annular part and the switch is controlled by deformation of the change-over pawls which can be shifted to two positions for interlocking to or detaching from a lever.

A type action of a single element printer is provided with a repeat mechanism which enables each type key to effect repeated printing of a corresponding type character. The depression of a selected type key initiates the operation of a character selection mechanism which determines the orientation of the print element to print the selected type character and at the same time operates a control means to enable a rotatable coupling means to cyclically drive the print element in an orienting moveme...

A microprocessor that executes a repeat prefetch instruction (REP PREFETCH). The REP PREFETCH prefetches multiple cache lines, wherein the number of cache lines is specifiable in the instruction. The instruction is specified by the Pentium III PREFETCH opcode preceded by the REP string instruction prefix. The programmer specifies the count of cache lines to be prefetched in the ECX register, similarly to the repeat count of a REP string instruction. The effective address of the first cache line ...

In an FDDI token ring network, a repeat filter that treats FDDI Set and Reset symbols occurring in a frame prior to an End Delimiter symbol as a violation and does not repeat these symbols onto the FDDI ring. In addition to the three states described in the FDDI repeat filter standard for a byte-wide implementation, a repeat filter in accordance with the present invention includes a fourth END state. The presence of this END state allows the REPEAT state to be restricted such that it treats byte...

Step and repeat apparatus used for performance operations upon a generally planar component such as a microprocessor wafer comprises a support for a workpiece, the support being attached by means of an arm to a mechanism adapted to move the support in two dimensions, the arm being pivotally secured to said mechanism at a location remote from the support and lifting means arranged to move the support about the pivot in a plane perpendicular to said two dimensions.