Videoconference

The UWA (University of Wales, Aberystwyth) gatekeeper currently has seven H.323 videoconferencing endpoints in its zone. These consist of: four UWA WVN PictureTel 970 CODECs (each with a potential bandwidth of up to 2Mbit/s). two Leadtek BVP 8770 H.323 videophones. These have a maximum bandwidth of 640kbit/s. a Tandberg® 8000, with a maximum bandwidth of 768kbit/s. These are distributed around the University as follows:
Pantone reference samples are normally used by graphics designers/printers and may be borrowed for comparison when purchasing curtains. These reference colours are intended for use on uncoated paper in the printing industry so, while they are a useful guide, it must be borne in mind that the surface texture of curtain material is very different from that of uncoated paper. With this caveat, the light to mid blue colours recommended for background curtains are: 279U 285U 292U 2925U 299U 2995U
Location of Room A quiet, convenient and central location is to be preferred. High levels of structural and airborne noise will be a problem so the room needs to be located away from sources of noise such as traffic, lifts, plumbing, workshops, plant rooms, air conditioning ducts, etc. Sounds that are a minor irritation to the ear can become unbearable when picked up by a microphone. Access should be suitable for persons with a physical disability. A ground floor location is normally preferable.
The Janet Videoconferencing Service (JVCS) provides central videoconferencing resource for both IP (H.323) and ISDN (H.320) endpoints, both point-point and multipoint. All users at Janet primary connected organisations are eligible to register and use the service free of charge (excluding ISDN call charges). Registered users may book guest endpoints in to videoconferences. In order to facilitate videoconferencing over IP JVCS operates a hierarchy of H.323 gatekeepers using the Global Dialling Scheme (GDS) as described on the IP Videoconferencing page.
In order to ensure standardised H.323 videoconferences can take place both within the UK and world wide, an H.323 Global Dialing Scheme (GDS) has been developed. SURFnet in the Netherlands, HEAnet in Ireland and ViDeNet in the US have also implemented this scheme. The GDS has been developed because a standardised H.323 addressing scheme is yet to be created. The GDS uses standards based E.164 addressing.
Data Sharing within Videoconferencing Author: Geoff Constable, University of Wales, Aberystwyth Version: 1 1. INTRODUCTION 2. DATA SHARING STANDARDS 3. INBAND DATA SHARING 3.1 Document Camera 3.2 Scan Conversion 3.3 Inband Data Sharing using T.120 4. OUTOFBAND DATA SHARING 5. MICROSOFT WINDOWS NETMEETING
The JANET Videoconferencing Service (JVCS) provides videoconferencing services to the Janet community within the UK. It consists of centralised equipment, a Service Desk and Booking Service to facilitate videoconferences using both ISDN and IP technologies. The service supports point-to-point (one-to-one) and multipoint videoconferences and provides a bridges to allow conferencing between IP and ISDN systems.
ISDN Videoconferencing ISDN is a service offered by telephone companies over the circuit switched network to support Voice, Telephone and Data Applications. This document will give an overview of H.320 protocols and outline the procedures for using JVCS-ISDN. Understanding ISDN There are two types of ISDN interface: Primary Rate ISDN (PRI) Interface and Basic Rate ISDN (BRI) interface. A BRI is an ISDN interface that provides two 64Kbps B-channels and one D-channel.
Introduction JVCS-Check (the JANET Videoconferencing Service-Check) is an easy to use online tool which provides an instant audio and video assessment facility for IP-based (H.323) videoconferencing endpoints.A typical JVCS-Check assessment session takes just over ten minutes to complete and consists of ten sections, each introduced by a technical summary from a recorded presenter:
Videoconferencing Quality Issues Note: these comments refer to Standard Definition videoconferencing. It is useful to consider some very basic information on how standard definition VC systems operate which will help in understanding the limitations of video quality over a videoconference link. There are two measures of quality in an image:
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