CEA-761-B defines minimum specifications for a one-way data path utilizing an 8 VSB trellis or a 16 VSB
remodulator in compliance with ATSC Standard A/53, Annex D, and also defines on-screen display (OSD) capabilities.
The network had room for expansion and the cost of access would be a modem, headend remodulator, and the cost of implementing LANs in the appropriate locations, a necessity in any case.
provided a rapidly modified M8023 modem and HR8023 headend remodulator to accommodate the need for off-channel transmission of medical images.
It provides the ability to expand well beyond the IEEE 802.3 minimum standard transmission coverage area of 3600 meters to 4500 meters, while still using a headend remodulator to minimize interference with adjacent services.
A modified modem and headend remodulator expanded the broadband uses, and implementing the standard options of those devices cost far less than implementing an entire new network of fiber.
The A-B broadband system consists of a Data Gateway connecting the A-B Data Highway to the broadband network; the head-end
remodulator for controlling on-line network operations; a Network Interface Controller (NIC) for interfacing intelligent, high-speed devices to the LAN; and a terminal communication server to interconnect up to eight nonintelligent RS-232 devices to the broadband system.
ProTelevision Technologies supplies modulators and
remodulators for DVB-T (Digital Video Broadcasting - Terrestrial).
Allen-Bradley is now developing specialized components such as modems, head-end
remodulators and switch gearboxes, gateway modules, and terminal-communications servers.