Central Office Switching

Burgess, P.N.; Stickel, J.E.

doi:10.1002/j.1538-7305.1971.tb01870.x

Cited by 9 publications

(1 citation statement)

References 4 publications

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“…Figure 22 shows the conceptual schema used for the switching and transmission of the Picturephone service [30]. Video could be switched on new "crossbar" public telephone exchanges, with analog technology, designed to switch signals up to 1 MHz [31]. To achieve uniform attenuation across the bandwidth, it was necessary to include amplifiers with equalization [32] at different points in the system, as shown in Figure 23.…”

Section: The Analog Electronic Agementioning

confidence: 99%

Video Conferencing Technologies: Past, Present and Future

Joskowicz

2023

Preprint

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<p>This paper describes the historical trajectory of video conferencing systems, spanning from their earlier mechanical and analog origins in the 1920s to the sophisticated IP-based services delivered from the cloud in the 2020s. Each technological age is examined, highlighting the technical and functional aspects that characterized its evolution. Commercial landmarks of each age are presented providing a comprehensive overview of the most prominent offerings at pivotal moments in the timeline. By examining the past and speculating on the future, this paper aims to provide a holistic understanding of the development, current state, and forthcoming trends in video conferencing technology.</p>

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Section: The Analog Electronic Agementioning

confidence: 99%

Video Conferencing Technologies: Past, Present and Future

Joskowicz

2023

Preprint

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Transmission Plan

Brown¹

1971

Bell System Technical Journal

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An important step in preparing for a nationwide, switched, video telephone service is the formulation of a transmission plan for the video and audio portion of the network. The transmission plan described in this paper features digital transmission for the long‐haul portion of the network and analog transmission for the local portion, close to the customer. The performance of each of the components of the network, that is, station equipment, local loops, trunks and switches, is discussed for the network as it is expected to be configured initially and as it might evolve through the 1970s.

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Baseband Video Transmission on Loops and Short-Haul Trunks

Brown¹

1971

Bell System Technical Journal

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Local Picturephone® service will be provided using present telephone cable facilities. Three cable pairs are required for each Picturephone call, one for audio and two for video transmission. Underground cables will be used extensively and aerial facilities to a limited extent. A cable equalizer will provide shaped gain to compensate for cable loss from 5 Hz to 1 MHz. This article discusses the plan for providing baseband video transmission on paired cable facilities, the cable equalizer design features, the important rules for engineering the video transmission system, and the maintenance features.

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Central Office Switching

Cited by 9 publications

References 4 publications

Video Conferencing Technologies: Past, Present and Future

Video Conferencing Technologies: Past, Present and Future

Transmission Plan

Baseband Video Transmission on Loops and Short-Haul Trunks

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