ETSI ETR 257 ed.1 (1996-03)

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 (ANs)

DTR/SPS-03040

Vmesnik V pri digitalnem storitvenem vozlišču (SN) – Identifikacija uporabnosti obstoječih specifikacij protokolov za referenčno točko VB5 v dostopih dostopovnih omrežij (AN)

General Information

• Status: Published
• Publication Date: 27-Mar-1996
• Technical Committee: SPS 3 - IN protocols
• Current Stage: 12 - Completion
• Due Date: 15-Mar-1996
• Completion Date: 28-Mar-1996
• Ref Project: SIST-TP ETSI/ETR 257 E1:2005 - 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 (ANs)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TP ETSI/ETR 257 E1:2005
01-januar-2005
9PHVQLN9SULGLJLWDOQHPVWRULWYHQHPYR]OLãþX61±,GHQWLILNDFLMDXSRUDEQRVWL
REVWRMHþLKVSHFLILNDFLMSURWRNRORY]DUHIHUHQþQRWRþNR9%YGRVWRSLK
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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 (ANs)
Ta slovenski standard je istoveten z: ETR 257 Edition 1
ICS:
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
SIST-TP ETSI/ETR 257 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP ETSI/ETR 257 E1:2005

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SIST-TP ETSI/ETR 257 E1:2005
ETSI ETR 257
TECHNICAL March 1996
REPORT
Source: ETSI TC-SPS Reference: DTR/SPS-03040
ICS: 33.020, 33.080
V interface, VB5 interface, SN, AN
Key words:
V interfaces at the digital Service Node (SN);
Identification of the applicability of existing
protocol specifications for a V reference point
B5
in an access arrangement with Access Networks (ANs)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
*
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1996. All rights reserved.

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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword .7
1 Scope .9
2 References.10
3 Definitions and abbreviations .11
3.1 Definitions .11
3.2 Abbreviations .12
4 Electrical, physical and procedural interface requirements.13
5 Services and architecture aspects and requirements .13
5.1 General discussion on services .13
5.2 General requirements for broadband access networks.15
5.3 General architectural requirements for the V reference point .15
B5
5.4 Applicability of the connection types .21
5.4.1 Connection characteristics .21
6 ATM functionality required over a V reference point.22
B5
6.1 General concepts relating to the V reference point .22
B5
6.2 The V reference point.24
B5.1
6.3 The V reference point.25
B5.2
7 Narrowband accesses: Conclusions for implementations at the V reference point.26
B5
7.1 Conclusions on ATM caused speech path delays for narrowband services.26
7.2 Narrowband services: Speech path delay considerations .26
7.3 AAL1 definition for the support of narrowband services .26
8 Broadband access: The B-ISDN access requirements and V implementation .27
B5
8.1 Discussion - The B-ISDN access.27
8.2 The preferred B-ISDN signalling protocol .27
8.3 The data link layer for the B-ISDN signalling protocol .27
9 Broadband accesses: The LAN interconnect service requirements and V implementation.27
B5
9.1 LAN interface support - Type 1.27
9.2 LAN interface support - Type 2.27
10 Broadband accesses: The broadcast TV service requirements and V implementation .28
B5
10.1 Discussion - The broadcast TV service .28
11 Broadband accesses: Signalling bandwidth allocation.29
11.1 Signalling bandwidth allocation - General discussion .29
11.1.1 Dynamic signalling bandwidth allocation - for ATM bearers.29
12 Broadband accesses: Bearer channel bandwidth allocation and concentration .30
12.1 Bearer channel bandwidth allocation and concentration - General discussion .30
12.2 Establishment of signalling virtual channels .30
13 Implementing dynamic bearer connection allocation on a V reference point .30
B5
13.1 Functionality of a B-BCC protocol for use at a V reference point.31
B5
13.2 The data link protocol for the B-BCC protocol .31
14 Broadband accesses: Control protocol .31
14.1 Control protocol - General discussion.31

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15 Broadband accesses: Link control protocol. 32
15.1 Link control protocol - General discussion . 32
15.1.1 Link control protocol - V . 32
B5.1
15.1.2 Link control protocol - V . 32
B5.2
16 Broadband accesses: Multiplexing cells for individual users onto a common transmission system
- General. 32
17 Broadband accesses: Conclusions for implementations at the V reference point. 33
B5
17.1 Conclusions on ATM caused speech path delays for broadband services:. 33
17.2 Conclusions on the preferred protocol to support narrowband services. 33
17.2.1 The preferred protocol to support a POTS or pseudo POTS service. 33
17.2.2 The preferred protocol to support narrowband ISDN based services . 33
17.3 Conclusions on the preferred B-ISDN signalling protocol . 33
17.4 Conclusions on the preferred B-BCC protocol for bandwidth allocation procedure. 33
17.5 Conclusions on the preferred control protocol . 34
17.6 Conclusions on the preferred link control protocol. 34
17.6.1 Link control protocol - V . 34
B5.1
17.6.2 Link control protocol - V . 34
B5.2
17.7 Conclusions on the preferred method of protection of signalling paths . 34
17.8 Conclusions on resource allocation and policing for a V based system. 34
B5
17.8.1 Conclusions on the use of the GFC field and its implementation in a V
B5
scenario . 34
17.8.2 Conclusion as to the use of the CLP bit of ATM messages at the V
B5
reference point. 35
18 Items for further study. 35
19 Future standardisation requirements for the V reference point. 35
B5
Annex A: Performance parameters associated with an ATM SN . 36
A.1 Introduction. 36
A.2 Measurement experience . 36
A.3 Proposal. 37
Annex B: Delay on the bearer channels associated with PSTN traffic . 38
B.1 Speech path delay considerations when an ATM bearer is used. 38
Annex C: Policing and the UPC/NPC functions . 39
C.1 UPC/NPC definition and description. 39
C.2 UPC/NPC location . 39
C.3 UPC/NPC in an AN-SN configuration. 39
C.3.1 UPC/NPC location. 39
C.4 Consequences. 41
Annex D: Examples of configurations of logical and physical user ports at the UNI. 42
D.1 General principles. 42
D.2 Examples of scenarios at the UNI . 42

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D.3 Requirements for operation and maintenance.44
D.3.1 Grouping of blockable objects .44
D.3.2 Different requirements for AN and SN.44
D.3.3 Possible approaches to meet requirements .44
D.4 Conclusion.44
Annex E: General narrowband services discussion .45
E.1 Discussion - The PSTN service .45
E.1.1 The preferred PSTN signalling protocol.45
E.1.2 The data link layer for the PSTN signalling protocol.45
E.2 Narrowband services: The ISDN-BA requirements and V implementation .45
B5
E.2.1 Discussion - The ISDN-BA service.45
E.2.2 The preferred ISDN-BA layer 3 signalling protocol.45
E.2.3 The data link layer (layer 2) for the ISDN-BA signalling protocol.46
E.3 Narrowband services: The ISDN-PRA requirements and V implementation.46
B5
E.3.1 Discussion - The ISDN-PRA service .46
E.3.2 The preferred ISDN-PRA layer 3 signalling protocol .46
E.3.3 The data link layer (layer 2) for the ISDN-PRA signalling protocol .46
E.4 Narrowband services: Signalling bandwidth allocation.46
E.5 Narrowband services: The control protocol.47
E.5.1 Control protocol for narrowband services .47
E.5.2 The data link layer for the control protocol.47
E.6 Narrowband services: Link control protocol layer 3.47
E.7 Narrowband services: Protection of signalling cells at the V reference point .48
B5
Annex F: General discussion on dimensioning of ATM access networks.49
F.1 The V reference point .49
B5.1
F.1.1 The AN is used for broadband UNIs only .49
F.1.2 The broadband AN is used for 2 Mbit/s emulation only .49
F.1.3 The broadband AN with mixed traffic.50
F.2 The V reference point .50
B5.2
F.3 Conclusion on dimensioning of ATM networks .50
Annex G: Examples for the support of LAN interconnect via V .51
B5
G.1 User plane.51
G.1.1 V based access networks.51
B5.1
G.1.2 V based access networks.51
B5.2
G.2 Control plane .51
G.2.1 V based access networks.51
B5.1
G.2.2 V based access networks.51
B5.2
G.3 Management plane.52
History.53

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Foreword
This ETSI Technical Report (ETR) has been produced by the Signalling Protocols and Switching (SPS)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
ETRs are informative documents resulting from ETSI studies which are not appropriate for European
Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An
ETR may be used to publish material which is either of an informative nature, relating to the use or the
application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or
an I-ETS.

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1 Scope
This ETSI Technical Report (ETR) examines the functional requirements for a broadband reference point
in conjunction with the previously defined V5, Narrowband Integrated Services Digital Network (N-ISDN),
and Broadband Integrated Services Digital Network (B-ISDN) protocols in order to define a useful set of
protocol component parts.
At this stage, the ETR does not attempt to define a unique protocol stack for a V reference point,
B5
because many possible network architectures have been identified, some based on an integrated
narrowband/broadband local exchange and others based on discrete local exchange architectures. All of
these would require different protocol stacks. Within ITU-T Study Group 13 (WP 3) Question 14/13, the
various architectures are being examined and provided in draft new ITU-T Recommendation G.902 [12]. It
might be possible to reduce the options listed in this ETR and come to a definite list of requirements
leading to definitive protocol stacks for the different types of interfaces at V reference points (i.e., V
B5 B5.1
and V ). However, this is left to the development of the individual ETSs.
B5.2
It has been identified that the B-ISDN service will only be provided over an ATM transmission bearer,
although that itself may be provided over a synchronous/plesiochronous data link network (e.g.
Synchronous Digital Hierarchy (SDH)). This somewhat simplifies the possible permutations of options.
New protocols may be identified for the V reference point as required.
B5
Access types so far identified to be supported by the V reference point include:
B5
- analogue telephone access;
- ISDN basic access with a line transmission system conforming to ETS 300 297 [4] for the case with
a NT1 separate from the Access Network (AN);
- ISDN basic access with a user network interface according to ETS 300 012 [2] at the user side of
the AN, (i.e. the interface at the T reference point);
- ISDN primary rate access with a line transmission system conforming to ETS 300 233 [3] for the
case with a NT1 separate from the AN;
- ISDN primary rate access with a user network interface according to ETS 300 011 [1] at the user
side of the AN, (i.e. the interface at the T reference point);
- other analogue or digital accesses for semi-permanent connections without associated out-band
signalling information;
- B-ISDN access;
- Non B-ISDN accesses supporting:
- asymmetric services (i.e. Video on Demand) (if not part of B-ISDN);
- broadcast services (if not part of B-ISDN);
- LAN interconnect functionality (if not part of B-ISDN),
with either:
- flexible (provisioned) Virtual Path Connection (VPC) allocation but without concentration capability
at the Virtual Channel (VC) level within the AN; or
- flexible (provisioned) VPC allocation and flexible Virtual Channel Connection (VCC) allocation on a
connection by connection basis which provides concentration capability at VC level.
This ETR does not specify the implementation of the requirements within the AN and does not constrain
any implementation alternative as long as the functionality at the V reference point as specified in this
B5
ETR is met.
Analysis of network architecture aspects are included. In particular, the relationship between narrowband
and broadband elements (ANs and SNs) are examined.

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2 References
This ETR incorporates by dated and undated reference, provisions from other publications. These
references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this ETR
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] ETS 300 011: "Integrated Services Digital Network (ISDN); Primary rate user-
network interface; Layer 1 specification and test principles".
[2] ETS 300 012: "Integrated Services Digital Network (ISDN); Basic user-network
interface; Layer 1 specification and test principles".
[3] ETS 300 233: "Integrated Services Digital Network (ISDN); Access digital
section for ISDN primary rate".
[4] ETS 300 297: "Integrated Services Digital Network (ISDN); Access digital
section for ISDN basic rate".
[5] 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".
[6] 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".
[7] ETS 300 125: "Integrated Services Digital Network (ISDN); User-network
interface data link layer specification; Application of CCITT Recommendations
Q.920/I.440 and Q.921/I.441".
[8] ETS 300 102-1: "Integrated Services Digital Network (ISDN); User-network
interface layer 3; Specifications for basic call control".
[9] ETS 300 443-1: "Broadband Integrated Services Digital Network (B-ISDN);
Digital Subscriber Signalling System No. two (DSS2) protocol; B-ISDN user-
network interface layer 3 specification for basic call/bearer control; Part 1:
Protocol specification [ITU-T Recommendation Q.2931 (1995), modified]".
[10] ITU-T Recommendation G.804 (1993): "ATM cell mapping into plesiochronous
digital hierarchy (PDH)".
[11] ITU-T Recommendation G.841 (1995): "Types and characteristics of SDH
network protection architectures".
[12] Draft new ITU-T Recommendation G.902: "Framework recommendation on
functional access networks. Access networks; Architecture, services,
management and service node aspects".
[13] ITU-T Recommendation I.356 (1993): "B-ISDN ATM layer cell transfer
performance".
[14] Draft ITU-T Recommendation I.363.1 (July 1995): "B-ISDN ATM adaptation
layer (AAL) specification, Types 1 and 2".
[15] Draft ITU-T Recommendation I.371 (July 1995): "Traffic control and congestion
control in B-ISDN".
[16] Draft ITU-T Recommendation I.432 (Nov 1994): "B-ISDN user-network interface
- Layer 1 specification".

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[17] Draft ITU-T Recommendation I.610 (Nov 1995): "B-ISDN operation and
maintenance principles and functions".
[18] CCITT Recommendation X.731 (1992) | ISO/IEC 10164-2 (1993): "Information
technology - Open systems interconnection - Systems management: State
management function".
[19] ITU-T Recommendation I.361 (1993): "B-ISDN ATM layer specification".
[20] ITU-T Recommendation I.150 (1993): "B-ISDN asynchronous transfer mode
functional characteristics".
[21] Draft new ITU-T Recommendation I.432.1 (July 1995): "B-ISDN user-network
interface - Physical layer specification for 155 520 kbit/s and 622 080 kbit/s".
[22] Draft new ITU-T Recommendation I.432.2 (July 1995): "B-ISDN user-network
interface - Physical layer specification for 1 544 kbit/s and 2 048 kbit/s".
[23] Draft new ITU-T Recommendation I.432.3 (July 1995): "B-ISDN user-network
interface - Physical layer specification for 51 840 kbit/s".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETR, the following definitions apply, in addition to those given in the referenced
standards:
Access Network (AN): An implementation comprising those entities (such as cable plant, transmission
facilities, etc.) which provide the required transport bearer capabilities for the provision of
telecommunications services between a Service Node Interface (SNI) and each of the associated User
Network Interfaces (UNIs). An AN can be configured and managed through a Q3 interface. In principle
there is no restriction on the types and the number of UNIs and SNIs which an AN may implement. The
AN does not interpret (user) signalling (see ITU-T Recommendation G.902 [12]).
asymmetric services: Services requiring different bandwidths in each direction at the same point in time.
complete user port: The sum of the physical links at an ATM UNI.
logical user port: The set of VPs at the UNI carried on one or several physical access links associated
by provisioning to one single VB5 reference point.
(semi)permanent connection: This is a connection which is set up via management (i.e. triggered via
Q3 and/or Q3 ).
AN SN
NOTE: There may be connections through the AN which are established via management
(Q3) which bypass the service node and which are routed e.g. to a dedicated "leased
line service network". These connections shall have no impact on the V specification
B5
and are out of scope of the ETR and the future V ETSs.
B5
Service Node (SN): A network element that provides access to various switched and/or permanent
telecommunication services. In case of switched services the SN is providing access call and connection
control signalling, and access connection and resource handling.
switched connection: This is a connection which is set up in response to user-to-network signalling.
user port function: This function adapts the specific UNI requirements into the core and system
management functions (see ITU-T Recommendation G.902 [12]).

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V : The VB5 reference point.
B5
V : The VB5 reference point with flexible (provisioned) VPC allocation but without concentration
B5.1
capability at VC level within the AN.
V : The VB5 reference point with flexible (provisioned) VPC allocation and flexible VCC allocation on a
B5.2
connection by connection basis which provides concentration capability at VC level.
3.2 Abbreviations
For the purposes of this ETR, the following abbreviations apply:
AAL ATM Adaptation Layer
AN Access Network
ATM Asynchronous Transfer Mode
BA Basic Access
BCC Bearer Channel Connection
B-AN Broadband Access Network
B-BCC Broadband BCC
B-ISDN Broadband ISDN
CBR Constant Bit Rate
CLP Cell Loss Priority (bit)
ET Exchange Termination
GFC Generic Flow Control
HDLC High level Data Link Controller
ILMI Interim LMI
ISDN Integrated Services Digital Network
LAN Local Area Network
LAPD Link Access Protocol for the D-channel
LE Local Exchange
NB Narrowband
N-ISDN Narrowband ISDN
NNI Network Node Interface
NPC Network Parameter Control
NT Network Termination
PDH Plesiochronous Digital Hierarchy
PNOs Public Network Operators
POTS Plain Old Telephony Service
PRA Primary Rate Access
PSTN Public Switched Telephone Network
QOS Quality Of Service
SAAL Signalling ATM Adaptation Layer
SDH Synchronous Digital Hierarchy
SN Service Node
SNI Service Node Interface
TE Terminal Equipment
TMN Telecommunications Management Network
TV Television
UNI User Network Interface
UPC Usage Parameter Control
VC Virtual Channel
VCC Virtual Channel Connection
VCI Virtual Channel Identifier
VC Sw Virtual Channel Switching function
VP Virtual Path
VPC Virtual Path Connection
VPCI Virtual Path Connection Identifier
VPI Virtual Path Identifier
VP XC Virtual Path Cross Connect function
XC Cross Connect

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4 Electrical, physical and procedural interface requirements
It is outside the scope of this ETR to specify the electrical and physical interfaces for the V reference
B5
point. The physical interface shall however be
...