PROOF - 2404
Keywords ISDN, ISDN PABX, X.400, X.500, ISDN gateways, Ethernet, LANs
Start Date: 01-JAN-89 / Duration: 48 months
[ contact / participants ]
Objectives and Approach
The objective of the PROOF project is to provide interconnectivity between workstations and servers in a mixed ISDN and Ethernet LAN environment and to explore how existing applications might be affect by, and new applications could take advantage of, such interconnectivity.
The final demonstration would show applications running over OSI protocol stacks supported on workstations and servers directly attached both to LANs and to a digital PABX. High performance LAN interconnect would be shown with gateways operating between LANs and Primary Rate ISDN (PRI) on the PBX.
As the project evolved further objectives were added including some evaluation of true WAN usage and home working - the original ISDN PBX was replaced by use of switched Public ISDN connections, including Basic Rate (BRI) as well as PRI. New applications included multimedia and high quality video using an "inverse multiplexer" to aggregate sufficient ISDN bandwidth.
The following techniques and capabilities were developed during the project:
A gateway to connect the public PRI to existing Ethernet LANs
- A very efficient "inverse multiplexer" capability conforming to the BONDING standard to aggregate high bandwidth across the ISDN by combining a number of discrete 64 Kbit/s calls and compensating for unequal cross-network propagation delays
- Experiments with home working, using dial-up workstation to LAN connection across the public ISDN. These showed that circumstances exist where, by adopting suitable automatic disconnection and re-connection strategies, near-LAN performance can be achieved across the ISDN at a significant saving over medium-distance commuting costs
- A flexible PRI common channel signalling protocol converter interfacing between the Euro-ISDN 1.421 protocol and others such as the UK DASS 2 standard
- A "channel groomer" capable of sharing a single PRI Access between a number of diverse, concurrently operating, ISDN equipments
- OSI Management MIBs for X.400 Mail and X.500 Directory services
- Integration of security and X.500 directory services, with remote authentication across X.25 and ISDN networks
- Integration of these services within a comprehensive OSI management system.
A number of spin-off products were developed and introduced into the market place:
- System Wizards enhanced their commercial X.500 (DirWiz) and X.400 product offerings, with particular emphasis on OSI management and security capabilities.
- UCL developed both BRI and PRI capabilities and have broadened established commercial relationships as a result.
- 3 NET introduced a number of products incorporating PROOF technology:
- OmniBAND 5050 (BANDMAN), a bandwidth management and conservation system for private PRI networks (with sales of over £3M before the end of the project)
- InterCHANGE PRI common channel signalling converters, with over 1200 conversions in service by mid-1993 and with applications both as CPE and inside PTO networks
- OmniBAND 2010, a multi-protocol PRI inverse multiplexer with PRI and multiple V.11/X.21 interfaces for data/video equipment, and with additional port-sharing capabilities to permit maximum use of the public ISDN access interface.
Mr J. Wratten
3 NET LTD
Ringway House, Bell Road
UK - BASINGSTOKE RG24 0QG
tel: + 44/ 256-843311
fax: + 44/ 256-840429
3 NET LTD - UK - C
SYSTEMS WIZARDS SRL - I - P
UNIVERSITY COLLEGE LONDON - UK - P
PROOF - 2404, December 1993
please address enquiries to the ESPRIT Information Desk
html version of synopsis by Nick Cook