ETSI ETS 300 299 ed.1 (1995-02)

Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access; Physical layer interfaces for B-ISDN applications

DE/NA-052511

Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) – Dostop do celičnega uporabniškega omrežja – Vmesniki fizične plasti za aplikacije v B-ISDN

General Information

• Status: Published
• Publication Date: 21-Feb-1995
• Technical Committee: NA 5 - Broadband Networks
• Current Stage: 12 - Completion
• Due Date: 01-Mar-1995
• Completion Date: 22-Feb-1995
• Ref Project: SIST ETS 300 299 E1:2003 - Broadband Integrated Services Digital Network (B-ISDN); Cell based user network access; Physical layer interfaces for B-ISDN applications

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 299 E1:2003
01-december-2003
âLURNRSDVRYQRGLJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL%,6'1±'RVWRSGR
FHOLþQHJDXSRUDEQLãNHJDRPUHåMD±9PHVQLNLIL]LþQHSODVWL]DDSOLNDFLMHY%,6'1
Broadband Integrated Services Digital Network (B-ISDN); Cell based user network
access; Physical layer interfaces for B-ISDN applications
Ta slovenski standard je istoveten z: ETS 300 299 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 299 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 299 E1:2003

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SIST ETS 300 299 E1:2003
EUROPEAN ETS 300 299
TELECOMMUNICATION February 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-052511
ICS: 33.080
ISDN, interface, access
Key words:
Broadband Integrated Services Digital Network (B-ISDN);
Cell based user network access
Physical layer interfaces for B-ISDN applications
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 1995. All rights reserved.
New presentation - see History box

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ETS 300 299: February 1995
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 Normative references.9
3 Definitions and abbreviations .10
3.1 Definitions 10
..........................................................................................................................
3.2 Abbreviations .10
4 Reference configuration at the user-network interface .11
4.1 Functional groups and reference points .11
4.2 Examples of physical realizations.11
4.3 Basic characteristics of the interfaces at T and S reference points 15
..............................
B B
4.3.1 Characteristics of the interfaces at 155 520 kbit/s .15
4.3.1.1 Interface at the T reference point 15
......................................
B
4.3.1.2 Interface at the S reference point.15
B
4.3.1.3 Relationship between interfaces at S and T .15
B B
4.3.2 Characteristics of the interfaces at 622 080 kbit/s 15
........................................
4.3.2.1 Interface at T reference point .15
B
4.4 Relationship between ISDN interfaces 15
..............................................................................
4.5 Functional groups characteristics .15
4.5.1 Network termination 1 for B-ISDN.15
4.5.2 Network termination 2 for B-ISDN 16
.................................................................
4.5.3 Terminal equipment for B-ISDN.16
4.5.3.1 Terminal equipment type 1 for B-ISDN 16
................................
4.5.3.2 Terminal equipment type 2 for B-ISDN.17
4.5.4 Terminal adapter for B-ISDN.17
5 User network interface specifications 17
................................................................................................
5.1 Interface location with respect to reference configuration .17
5.2 Interface location with respect to the wiring configuration 17
.................................................
6 Service and layering aspects of the physical layer.18
6.1 Services provided to the ATM-layer.18
6.2 Service primitives exchanged with the ATM layer 18
.............................................................
6.3 Sublayering of the physical layer .18
7 Physical medium characteristics of the user network interface at 155 520 kbit/s 18
.............................
7.1 Characteristics of the interface at the T reference point .18
B
7.1.1 Bit rate and interface symmetry.18
7.1.2 Physical characteristics 18
.................................................................................
7.1.2.1 Electrical interface .18
7.1.2.1.1 Interface range 18
......................................
7.1.2.1.2 Transmission medium .18
7.1.2.1.3 Electrical parameters at interface
points I and I 19
.....................................
a b
7.1.2.1.4 Electrical connectors.19
7.1.2.1.5 Line coding 19
............................................
7.1.2.1.6 EMC/EMI requirements .19
7.1.2.2 Optical interface.21
7.1.2.2.1 Attenuation range 21
..................................
7.1.2.2.2 Transmission medium .21
7.1.2.2.3 Optical parameters 21
...............................
7.1.2.2.3.1 Line coding.21
7.1.2.2.3.2 Operating wavelength.21
7.1.2.2.3.3 Input and output port characteristics 22
.....

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7.1.2.2.4 Optical connectors . 22
7.1.2.2.5 Safety requirements. 22
7.2 Characteristics of the interface at the S reference point 22
.................................................
B
8 Physical medium characteristics of the UNI at 622 080 kbit/s. 22
8.1 Characteristics of the interface at the T reference point 22
.................................................
B
8.1.1 Bit rate and interface symmetry. 22
8.1.2 Physical characteristics . 22
8.1.2.1 Attenuation range 22
................................................................
8.1.2.2 Transmission medium. 23
8.1.2.3 Optical parameters 23
..............................................................
8.1.2.3.1 Line coding. 23
8.1.2.3.2 Operating wavelength . 23
8.1.2.3.3 Input and output port characteristics 23
....
8.1.2.4 Optical connectors . 23
8.1.2.5 Safety requirements 23
............................................................
8.2 Characteristics of the interface at the S reference point. 23
B
9 Power feeding. 24
9.1 Provision of power 24
.............................................................................................................
9.2 Power available at B-NT1. 24
9.3 Feeding voltage 24
.................................................................................................................
9.4 Safety requirements . 24
10 Functions provided by the transmission convergence sublayer. 24
10.1 Transfer capability 24
.............................................................................................................
10.1.1 Interface at 155 520 kbit/s . 24
10.1.2 Interface at 622 080 kbit/s 25
............................................................................
10.2 Physical layer aspects. 25
10.2.1 Timing . 25
10.2.2 Interface structure for 155 520 kbit/s and 622 080 kbit/s 25
.............................
10.3 Header error control . 25
10.3.1 Header error control functions 25
......................................................................
10.3.2 Header Error Control (HEC) sequence generation. 28
10.4 Idle cells . 28
10.5 Cell delineation and scrambling 29
........................................................................................
10.5.1 Cell delineation and scrambling objectives. 29
10.5.1.1 Cell delineation algorithm 29
....................................................
10.5.2 Cell delineation performance . 30
10.5.3 Scrambler operation . 30
10.5.3.1 Distributed sample scrambler (31st order). 30
10.5.3.2 Transmitter operation. 30
10.5.3.3 Receiver operation 31
..............................................................
10.5.3.4 State transition diagram and mechanism . 32
10.6 Cell availability performance . 33
11 UNI related OAM functions. 33
11.1 Transmission overhead allocation. 33
11.2 OAM cell identification 34
.......................................................................................................
11.3 Allocation of OAM functions in information field . 35
11.4 Maintenance signals 37
..........................................................................................................
11.5 Transmission performance monitoring. 38
11.6 Control communication . 38
12 Operational functions 38
........................................................................................................................
12.1 Definition of signals at the interface . 38
12.2 Definitions of state tables at network and user sides 38
........................................................
12.2.1 Layer 1 states on the user side of the interface. 39
12.2.2 Layer 1 states at the network side of the interface. 40
12.2.3 Definition of primitives 42
...................................................................................
12.2.4 State tables. 42
Annex A (informative): Impact of random bit errors on HEC performance 46
............................................

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Annex B (informative): Impact of random bit errors on cell delineation performance .47
Annex C (informative): Distributed sample scrambler descrambler implementation example .48
History 50
..........................................................................................................................................................

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS defines the cell based user network access physical layer interfaces to be applied to the T , S
B B
reference points of the reference configurations of the Broadband Integrated Services Digital Network
(B-ISDN) User-Network Interface (UNI), for B-ISDN applications. It addresses the transmission system
structure that may be used at these interfaces as well as the implementation of the UNI related Operation
And Maintenance (OAM) functions at the cell based physical layer.
The production of this ETS has taken into account the recommendations given in CCITT
Recommendations I.413 [7] and I.432 [8].
Transposition dates
Date of latest announcement of this ETS (doa): 31 May 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1995
Date of withdrawal of any conflicting National Standard (dow): 30 November 1995

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1 Scope
This European Telecommunication Standard (ETS) defines the physical layer interface to be applied to
the S and T reference points of the reference configurations of the Broadband Integrated Services
B B
Digital Network (B-ISDN) cell based User-Network Interface (UNI) at 155 520 kbit/s and 622 080 kbit/s. It
addresses separately the physical media and the transmission system used at these interfaces and
addresses also the implementation of UNI related Operation And Maintenance (OAM) functions.
The selection of the physical medium for the interfaces at the S and T reference points should take into
B B
account that optical fibre is agreed as the preferred medium to be used to cable customer equipment.
However, in order to accommodate existing cabling of customer equipment, other transmission media
(e.g. coaxial cables) should not be precluded. Also, implementations should allow terminal
interchangeability.
This ETS reflects in its structure and content the desire to take care of such early configurations and
introduces a degree of freedom when choosing a physical medium at the physical layer.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative 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 ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ITU-T Recommendation G.652: "Characteristics of a single-mode optical fibre
cable".
[2] CCITT Recommendation G.703: "Physical/electrical characteristics of
hierarchical digital interfaces".
[3] ITU-T Recommendation G.957: "Optical interfaces for equipments and systems
relating to the synchronous digital hierarchy".
[4] ITU-T Recommendation I.113: "Vocabulary of terms for broadband aspects of
ISDN".
[5] CCITT Recommendation I.321: "B-ISDN protocol reference model and its
application".
[6] ITU-T Recommendation I.361: "B-ISDN ATM layer specification".
[7] CCITT Recommendation I.413 (1992): "B-ISDN user-network interface".
[8] CCITT Recommendation I.432 (1992): "B-ISDN user-network interface -
Physical layer specification".
[9] CCITT Recommendation I.610 (1992): "B-ISDN operation and maintenance
principles and functions".
[10] CCITT Recommendation X.200: "Reference model of Open System
Interconnection for CCITT Applications".
[11] I-ETS 300 404: "Broadband Integrated Services Digital Network (B-ISDN);
B-ISDN Operation And Maintenance (OAM) principles and functions".
[12] IEC Publication 825: "Radiation safety of laser products equipment classification
requirements and user's guide".
[13] IEC Publication 950: "Safety of information technology equipment, including
electrical business equipment".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the definitions given in ITU-T Recommendation I.113 [4] apply, in particular
for the definitions of idle cell, valid cell and invalid cell. In addition, the following definition applies:
to be defined: These items or values are not yet specified.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AIS Alarm Indication Signal
ATM Asynchronous Transfer Mode
BER Bit Error Rate
B-ISDN Broadband Integrated Services Digital Network
B-NT B-ISDN Network Termination
B-TA B-ISDN Terminal Adaptor
B-TE B-ISDN Terminal Equipment
BIP Bit Interleaved Parity
CLP Cell Loss Priority
CMI Coded Mark Inversion
CRC Cyclic Redundancy Check
FERF Far End Receive Failure
HEC Header Error Control
LAN Local Area Network
NNI Network Node Interface
MA Medium Adaptor
MPH Management Physical Header
NRZ Non Return to Zero
OAM Operation and Maintenance
OSI Open System Interconnection
PH Physical Header
PM Physical Medium
p.p.m part per million
PRBS Pseudo Random Binary Sequence
STI Surface Transfer Impedance
TC Transmission Convergence
TFV Terminal Failure Voltage
UNA User Network Access
UNI User Network Interface
TFV Terminal Failure Voltage

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4 Reference configuration at the user-network interface
4.1 Functional groups and reference points
The reference configurations defined for ISDN basic access and primary access are considered general
enough to be applicable to all aspects of the B-ISDN accesses.
Figure 1 shows the B-ISDN reference configurations which contain the following:
- functional groups: B-NT1, B-NT2, B-TE1, TE2, B-TE2, and B-TA;
- reference points: T , S and R.
B B
S
T
B B
B-TE1 B-NT2 B-NT1
S
R
B
TE2
or B-TA
B-TE2
Reference point
B-TA  Broadband terminal adaptor
B-TE  Broadband terminal equipment
B-NT  Broadband network termination
Functional group
Figure 1: B-ISDN reference configurations
In order to clearly illustrate the broadband aspects, the notations for reference points and for functional
groups with broadband capabilities are appended with the letter B (e.g. B-NT1, T ). The broadband
B
functional groups are equivalent to the functional groups defined in ISDN. Interfaces at the R reference
point may or may not have broadband capabilities.
Interfaces at reference points S and T will be standardized. These interfaces will support all ISDN
B B
services.
4.2 Examples of physical realizations
Figure 2 gives examples of physical configurations illustrating combinations of physical interfaces at
various reference points. The examples cover configurations that could be supported by standardized
interfaces at reference points S and T . Other configurations may also exist. For example, physical
B B
configurations of B-NT2 may be distributed, or use shared medium, to support Local Area Network (LAN)
emulation and other applications.
Figure 3 illustrates possible physical configurations, but does not preclude alternative configurations.
Whether a single interface at the S reference point can cover different configurations, as illustrated in
B
figure 3, is for further study.
Figure 2 is subdivided into separate items as follows:
- figures 2a) and 2b) show separate interfaces at the S and T reference points;
B B
- figures 2c) and 2d) show an interface at S but not at T ;
B B
- figures 2e) and 2f) show an interface at T but not at S ;
B B
- figures 2g) and 2h) show separate interfaces at S, S and T ;
B B
- figures 2i) and 2j) show interfaces at S and T which are coincident.
B B

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Additionally, figures 2b), 2d), 2f), 2h) and 2j) show an interface at reference point R.
B-TE1 B-NT2 B-NT1
a)
S T
BB
TE2 or
B-TA
B-NT2 B-NT1
b)
B-TE2
R S T
BB
Configurations where B-ISDN physical interfaces occur at reference points S and T .
B B
B-TE1
c)
B-NT2 + B-NT1
S
B
TE2 or
B-TA
d)
B-NT2 + B-NT1
B-TE2
S
R
B
Configurations where B-ISDN physical interfaces occur at reference point S only.
B
B-TE B-NT2 B-NT1
e) +
T
B
TE2 or
B-TA B-NT2 B-NT1
+
f)
B-TE2
R T
B
Configurations where B-ISDN physical interfaces occur at reference point T only.
B
TE1
g)
S
B-NT2 B-NT1
T
B
B-TE1
S
B
TE2
h) TA
R S
B-NT2
B-NT1
T
B
B-TE1
S
B
Configurations where B-ISDN and ISDN physical interfaces occur at reference points S, S and T .
B B
B-TE1 B-NT1
i)
S  and T
B B
coincident
TE2 or
B-TA
B-NT1
j)
B-TE2
R
S  and T
B B
coincident
Configurations where a single B-ISDN physical interface occurs at a location where both reference
points S and T coincide.
B B
Physical interface at the Equipm ent im plem enting
designated reference point functional groups
Figure 2: Examples of physical configurations for broadband user applications

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a) centralised B-NT2 configuration:
B - TE1
S
B
T
B
S
B
B - TE1
B - N T2 B - NT1
S
B
B - TE1
b) distributed B-NT2 configurations:
b1) generic configuration
B - NT2
(note 5)
T
WW W
B
MA MA MA MA
B - NT1
(note 1)
S S
B B
B - TA
B - TA
R R
TE2 TE2
or or
B - TE1
B - TE2 B - TE2
b2) physical configurations
WW
T
B
MA MA MA
B - NT1
S S
B B
B - TE1 B - TE1
B - TE1
S
B
WW
MA
S T
B B
B - TE1
B - NT1
MA MA
W W
MA
S
B
B - TE1
Figure 3: Examples of physical configurations for multipoint applications (continued)

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c) multi-access B-TE configurations:
c1) generic configurations (note 7)
(note 3)
S
T
SS
SS
B B
B B
B - NT2 B - NT1
B - TE B - TE B - TE
* * *
c2) physical configurations
SS SS
B B
B - TE B - TE B - TE
S
* * *
B
T
SS SS S
B
B B B
B - NT2 B - NT1
B - TE B - TE B - TE
* * *
S
B
SS SS
B B
B - TE B - TE B - TE
* * *
(note 4)
(note 5)
SS SS
S T
B B B B
B - N T2 B - NT1
B - TE B - TE B - TE
* * *
(note 4)
(note 5)
(note 6)
S
B
SS SS S
T
B B B B
B - TE B - TE B - TE
B - N T2 B - NT1
* * *
NOTE 1: Medium Adaptor (MA): accommodates the specific topology of the distributed B-NT2.
The interface at W may include topology dependant elements and may be a non-
standardized interface.
NOTE 2: There will be a physical link between these two MAs in the case of ring configurations.
NOTE 3: There will be a physical link between B-TE and B-NT2 in the case of ring
configurations.
NOTE 4: The B-TE* includes shared medium access functions.
NOTE 5: The measurable physical characteristics of the SS interface are identical to those of
B
the S interface. The functional characteristics of the interface, however, may be a
B
superset of those at the S interface.
B
NOTE 6: The B-NT2 may be null in the case of commonality between S and T .
B B
NOTE 7: Additional termination functions (e.g. for loopback in bus configuration) and OAM
functions may be necessary for multi-access B-TE configurations. Requirements and
implementations of these functions are for further study.
Figure 3 (concluded): Examples of physical configurations for multipoint applications

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4.3 Basic characteristics of the interfaces at T and S reference points
B B
4.3.1 Characteristics of the interfaces at 155 520 kbit/s
4.3.1.1 Interface at the T reference point
B
There is only one interface per B-NT1 at the T reference point. The operation of the physical medium is
B
point-to-point in the sense that there is only one sink (receiver) in front of one source (transmitter).
Point-to-multipoint configurations at T at ATM and higher layers are for further study.
B
4.3.1.2 Interface at the S reference point
B
One or more S interfaces per B-NT2 are present. The interface at the S reference point is point-to-point
B B
at the physical layer in the sense that there is only one sink (receiver) in front of one source (transmitter)
and may be point to multipoint at the other layers.
4.3.1.3 Relationship between interfaces at S and T
B B
Configurations described in figures 2i) and 2j) require that the interface specifications at T and S should
B B
have a high degree of commonality, in order to ensure that a simple broadband terminal may be
connected directly to the T interface.
B
The feasibility of achieving the needed commonality is for further study.
4.3.2 Characteristics of the interfaces at 622 080 kbit/s
4.3.2.1 Interface at T reference point
B
There is only one interface per B-NT1 at the T reference point. The operation of the physical medium is
B
point-to-point in the sense that there is only one sink (receiver) in front of one source (transmitter).
Point-to-multipoint configurations at T at ATM and higher layers are for further study.
B
4.4 Relationship between ISDN interfaces
Figures 2g) and 2h) show configurations where B-ISDN and ISDN interfaces may occur at S and S
B
respectively. In this case, B-NT2 functionalities have to ensure the interface capabilities for both S and S .
B
Other configurations for supporting terminals at the interface at the S reference point may exist.
4.5 Functional groups characteristics
Lists of functions for each functional group are given below. Each particular function is not necessarily
restricted to a single functional group. For example, "interface termination" functions are included in the
function lists of B-NT1, B-NT2 and B-TE. The function lists for B-NT1, B-NT2, B-TE and B-TA are not
exhaustive. Not all specific functions in a functional group need to be present in all implementations.
4.5.1 Network termination 1 for B-ISDN
This functional group includes functions broadly equivalent to layer 1 of the Open System Interconnection
(OSI) reference model. Examples of B-NT1 functions are:
- line transmission termination;
- transmission interface handling;
- cell delineation;
- OAM functions.

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4.5.2 Network termination 2 for B-ISDN
This functional group includes functions broadly equivalent to layer 1 and higher layers of the CCITT
Recommendation X.200 [10] reference model. B-NT2 can be null in the case of commonality between T
B
and S
B.
Examples of B-NT2 functions are:
- adaptation functions for different media and topologies (MA functions);
- functions of a distributed B-NT2;
- cell delineation;
- concentration;
- buffering;
- multiplexing/demultiplexing;
- resource allocation;
- usage parameter control;
- adaptation layer functions for signalling (for internal traffic);
- interface handling (for the T and S interfaces);
B B
- OAM functions;
- signalling protocol handling;
- switching of internal connections.
B-NT2 implementations may be concentrated or distributed. In a specific access arrangement, the B-NT2
may consist only of physical connections. When present, implementations of the B-NT2 are loc
...