Abstract: A videoconferencing network for digital computer workstations that operate on a local area network (LAN) to exchange data. The network includes a signalling local area network (A-LAN), connected to a first port of a plurality of workstations, for transmitting and receiving data signals between selected ones of the workstations and a broadband local area network (B-LAN) connected to a second port of the plurality of workstations, for transmitting and receiving television signals between selected ones of these workstations. Each television signal is transmitted at a selected frequency channel so that no two transmissions interfere. A software program, stored in and operable on the computer of each workstation, generates and receives data messages, transmitted via the A-LAN, to and from the computer of another workstation, respectively.

Abstract: A videoconferencing network for digital computer workstations that operate on a local area network (LAN) to exchange data. The network includes a signalling local area network (A-LAN), connected to a first port of a plurality of workstations, for transmitting and receiving data signals between selected ones of the workstations and a broadband local area network (B-LAN) connected to a second port of the plurality of workstations, for transmitting and receiving television signals between selected ones of these workstations. Each television signal is transmitted at a selected frequency channel so that no two transmissions interfere. A software program, stored in and operable on the computer of each workstation, generates and receives data messages, transmitted via the A-LAN, to and from the computer of another workstation, respectively.

Abstract: In the fabrication of an ink jet nozzle structure for ink jet printing, photoform glass is initially exposed in the general configuration of the ink chambers and nozzles desired to be formed in the glass. Thin transverse lines are left unexposed across the desired transition point between the ink chamber and the nozzle, and across a transition between ink inlet and the chamber. The ink chamber is desired to be of greater depth than either the inlet area or the nozzle, so two-step acid etching is used. The nozzle and the inlet are masked, as by taping, during a portion of the acid etching and unmasked during another portion, so that the chamber (which is never masked) is etched deeper than the inlet and nozzle areas.