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The VB5 interface

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BT Technology Journal

Abstract

The VB5 interface is an ATM-based broadband interface at the ‘V’ reference point, the interface between a user access and a service node (SN), also known as the SNI (service node interface) within the ITU-T. The B-ISDN architectural model allows for a number of different user accesses, such as straightforward digital sections and simple multiplexers, but it is anticipated that the most frequent implementation, particularly for mass deployment, will be via a broadband access network (AN) with VB5 interfaces.

The VB5 interface is specified in a similar way to its narrowband cousin V5, in two variants – VB5.1, which supports allocation of resources via the management system, and VB5.2, which adds a mechanism for allocating AN resources under the control of the SN, enabling call-by-call concentration in the AN. This paper describes the background to the development of VB5 and explains the two variants VB5.1 and VB5.2.

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References

  1. ETS 300 324–1: ‘signalling protocols and switching (SPS): V interfaces at the digital local exchange (LE); V5.1 interface for the support of access network (AN); Part 1: V5.1 interface specification’, (1995).

  2. ETS 300 347–1: ‘signalling protocols and switching (SPS): V interfaces at the digital local exchange (LE); V5.2 interface for the support of access network (AN); Part 1: V5.2 interface specification’, (1994)

  3. ITU-T Recommendation G.964: ‘V Interfaces at the digital local exchange (LE) – V5.1 interface (based on 2048 kbit/s) for the support of access networks (AN)’, (1994).

  4. ITU-T Recommendation G.965: ‘V Interfaces at the digital local exchange (LE) – V5.2 interface (based on 2 048 kbit/s) for the support of access networks (AN)’, (1995).

  5. EN 301 005–1: ‘V interfaces at the digital service node (SN): interfaces at the VB5.1 reference point for the support of broadband or combined narrowband and broadband access networks (ANs); Part 1: interface specification’, (1997).

  6. Draft DEN/SPS 03047–1: ‘V interfaces at the digital service node (SN); interfaces at the VB5.2 reference point for the support of broadband or combined narrowband and broadband access networks (ANs); Part 1: Interface specification’, (1997).

  7. ITU-T Recommendation G.902: ‘Framework Recommendation on functional access networks – architecture and functions, access types, management and service node aspects’, (1995).

  8. ITU-T Recommendation I.414: ‘Overview of Recommendations on layer 1 for ISDN and B-ISDN customer accesses’, draft revised (1996).

  9. ETR 257: ‘signalling protocols and switching (SPS): V interfaces at the digital service node (SN); identification of the applicability of existing protocol specifications for a VB5 reference point in an access arrangement with access networks’, (1995).

  10. ITU-T Recommendation I.610: ‘B-ISDN operation and maintenance principles and functions’, (1995).

  11. ETS 300 443–1: ‘Broadband integrated services digital network (BISDN); digital subscriber signalling system No 2 (DSS2) protocol; BISDN user-network interface layer 3 specification for basic call/bearer control; Part 1: Protocol specification [ITU-T Recommendation Q.2931 (1995), modified]’, (1996).

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  16. Draft DEN/SPS-03049–1: ‘signalling protocols and switching (SPS) management interfaces associated with the VB5.1 Reference Point Part 1: Interface Specifications’, (1997).

  17. Draft DEN/SPS-03045–1: ‘signalling protocols and switching (SPS) management interfaces associated with the VB5.2 Reference point Part 1: interface specifications’, (1997).

  18. DAVIC Specification Part 02, Revision 3.0: ‘system reference models and scenarios (technical report)’, (see also DAVIC 1.0 part 0.4.) (1997).

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  20. ATM Forum Technical Committee: Residential Broadband Working Group: baseline text document: ‘BTD-RBB-001.02’, Chicago, Illinois, (April 1997).

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Authors and Affiliations

  1. BT Laboratories, Martlesham Heath, Ipswich, Suffolk, England, IP 5 3RE

    M A Hale, A T Gillespie & K A James

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  1. M A Hale
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  2. A T Gillespie
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  3. K A James
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Hale, M.A., Gillespie, A.T. & James, K.A. The VB5 interface. BT Technology Journal 16, 99–111 (1998). https://doi.org/10.1023/A:1009622100015

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  • DOI: https://doi.org/10.1023/A:1009622100015

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