Transmission Plan

Brown, HE

doi:10.1002/j.1538-7305.1971.tb01863.x

Cited by 17 publications

(1 citation statement)

References 15 publications

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“…An image of a hierarchical switching stage for a video network is assumed here to be almost the same as that for a voice network, and digital systems could be applied for switching stages above toll centers (TC) from practical viewpoints [4] .…”

Section: A Practical Codec Arrarzgemerztsmentioning

confidence: 99%

On Construction Methods for Digital Video Networks

Ohtake

Kuroyanagi

1976

IEEE Trans. Commun.

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Construction methods for digital video networks which transmit various kinds of information signals are studied. It is pointed out that, in order to construct the actual video networks, such problems appear as the introductory process or changing process of the networks. Network flexibility, transparency, and cost performance are major requirements to consider, especially for video networks.To resolve these problems, three important items, i.e., codec arrangements, selective control of analog-digital circuits, and multiplexing with group switching, are taken up and examined. Several systems comprising new proposals are analyzed and compared with one another.

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Section: A Practical Codec Arrarzgemerztsmentioning

confidence: 99%

On Construction Methods for Digital Video Networks

Ohtake

Kuroyanagi

1976

IEEE Trans. Commun.

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The Network

Dorros¹

1971

Bell System Technical Journal

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A Picturephone® network will take maximum advantage of existing telephone equipment. To provide service, a new videotelephone set will be added to a Touch‐Tone® telephone installation. Video access lines (loops) to the serving central office will be provided using additional regular wire pairs, appropriately equalized. Arrangements are being provided for extending PBX and key telephone customer switching arrangements to have a Picturephone capability. Central office switching will be accomplished by auxiliary video switches under the control of ordinary switching machines. Short‐haul trunks will be provided on ordinary trunk cables equipped with equalizers as for loops. Long‐haul trunks will make use of existing and planned systems, with additional equipment needed only at the terminals. The network was designed primarily for face‐to‐face communications, but two additional services are being offered at the outset: data communications at 460.8 kb/s and interfacing arrangements for access to a customer's computer. Other new services are in the offing.

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Service Standards

Crater¹

1971

Bell System Technical Journal

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We describe in this paper the fundamental requirements of a visual telephone service. These lead to a basic physical configuration of the station equipment. The picture standards are chosen to provide the visual adjunct at no greater cost than is necessary to secure most of the possible enhancement of direct conversation. Transmission standards are established with the objective of limiting to an acceptable range the difference in quality between the image as viewed at the originating station and as received over the longest connection possible in the network.

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Transmission Plan

Cited by 17 publications

References 15 publications

On Construction Methods for Digital Video Networks

On Construction Methods for Digital Video Networks

The Network

Service Standards

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