SIST ETS 300 080 E1:2003

SLOVENSKI STANDARD
SIST ETS 300 080 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Protokoli za nižje ravni
sistema ISDN za telematske terminale
Integrated Services Digital Network (ISDN); ISDN lower layer protocols for telematic
terminals
Ta slovenski standard je istoveten z: ETS 300 080 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 080 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 080 E1:2003

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SIST ETS 300 080 E1:2003
EUROPEAN ETS 300 080
TELECOMMUNICATION September 1992
STANDARD
Source: ETSI TC-TE Reference: T/TE 12-04
ICS: 33.080
ISDN, Terminal Equipment
Key words:
Integrated Services Digital Network (ISDN);
ISDN lower layer protocols for telematic terminals
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 - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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 1992. All rights reserved.
New presentation - see History box

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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.9
1 Scope . 11
2 Normative references . 11
3 Abbreviations. 13
4 Model description. 14
4.1 Protocol pillars. 14
4.2 Co-ordination between B-channel and D-channel . 15
4.2.1 Multiple B-channels. 15
4.2.2 Active B-channel connection. 15
4.2.3 Established B-channel. 15
4.2.4 B-channel disconnection by the network . 16
4.3 Mapping of ETS 300 102-1 causes to OSI CONS reasons. 16
5 Layer 1 protocols. 18
5.1 Basic access . 18
5.2 Primary rate access. 18
6 D-channel layer 2 . 18
7 D-channel layer 3 . 18
7.1 The access protocol. 18
7.2 Terminal selection and compatibility checking . 18
7.2.1 Compatibility information provided by the calling terminal. 18
7.2.1.1 Bearer capability . 19
7.2.1.2 Low layer compatibility. 19
7.2.1.3 High layer compatibility. 20
7.2.2 Compatibility checking by the called terminal . 21
7.2.3 Call acceptance conditions. 21
7.3 Service specific use of supplementary services . 22
7.3.1 Supplementary services for addressing. 22
7.3.2 Supplementary services for identification. 22
7.3.3 Other supplementary services . 22
8 B-channel protocols. 22
8.1 B-channel Layer 2 . 22
8.1.1 Base protocols. 22
8.1.2 General rules for base protocol CCITT Recommendation X.75 . 23
8.1.2.1 STE - DTE. 23
8.1.2.2 Single link procedure. 23
8.1.2.3 Data link layer address procedure. 23
8.1.2.4 Mode of operation . 23
8.1.3 Specific rules for base protocol CCITT Recommendation X.75 . 24
8.1.4 Application rules for base protocol ISO 7776. 26
8.1.5 Synchronisation. 28
8.2 B-channel layer 3 . 28
8.2.1 DTE/DCE role. 28
8.2.2 Logical channels to be used . 29
8.2.3 Packet sizes . 29
8.2.4 Default packet level window size . 29
8.2.5 Default throughput class. 29

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8.2.6 D-bit.29
8.2.7 Q-bit.30
8.2.8 Protocol identifier .30
8.2.9 INTERRUPT packet.30
8.2.10 Packet Data Units (PDUs).30
8.2.11 Encoding of Network Service Access Point (NSAP) addresses .31
8.2.12 Optional user facilities and CCITT specified DTE facilities.31
8.2.12.1 Facilities that shall be implemented .32
8.2.12.1.1 On-line facility registration .32
8.2.12.1.2 Fast select facility. 32
8.2.12.1.3 Expedited data negotiation facility .33
8.2.12.2 Facilities that shall not be used .33
8.2.12.3 Allowed Facilities which are not recommended.33
9 Layer 4 transport protocol.33
9.1 Additional application rules for the transport protocol in CCITT Recommendation T.70
(layer 4) .33
9.1.1 Transport Protocol Data Unit (TPDU) size negotiation.33
9.1.2 Timer values .33
9.1.3 Handling of Transport Service Access Point Identifier (TSAP-ID) as
initiator of a transport connection establishment.34
9.1.4 Handling of TSAP-ID responding to a transport connection establishment
attempt.34
9.1.5 Use of N-CONNECT primitives for transport protocol identification.34
9.2 Specification of the additional application rules for the transport protocol in ISO/IEC
8073 and CCITT Recommendation X.224 (layer 4) .34
9.2.1 Protocol classes. 34
9.2.2 Timer supervision .34
9.2.3 Timer values .34
9.2.4 Basic length indicator value .34
9.2.5 Handling of TSAP-ID as initiator of a transport connection establishment .35
9.2.6 Handling of TSAP-ID responding to a transport connection establishment
attempt.35
9.2.7 Use of N-CONNECT primitives for transport protocol identification.35
Annex A (informative): Comparison between ISO 7776 and CCITT Recommendation X.75 Layer 2 .36
A.1 Referenced documents .36
A.1.1 ISO 7776.36
A.1.2 ISO/IEC JTC 1/SC 6 N 5571.36
A.1.3 CCITT Recommendation X.75 (1988) .36
A.1.4 CCITT Recommendation X.75.36
A.2 Introduction.36
A.3 Table of differences.37
A.4 Details of the differences .38
A.4.1 Unnumbered frames modulo 128 (CCITT Recommendation X.75, table 2).38
A.4.2 Invalid frame (ISO 7776, subclause 3.8 - CCITT Recommendation X.75, § 2.3.5.3) .38
A.4.3 SABM control byte encoding (ISO 7776, table 6).38
A.4.4 DM as mode set request (ISO 7776, subclause 4.3.8).38
A.4.5 Conditions to send FRMR (ISO 7776, subclause 4.3.9 - CCITT Recommendation X.75,
§ 2.3.4.9) .38
A.4.6 Busy condition/Receiving a RNR.39
A.4.7 N(S) sequence error recovery .39
A.4.8 Start T1 after transmitted REJ (ISO 7776, subclause 4.4.2.2 - CCITT
Recommendation X.75, § 2.3.5.2.1) .40
A.4.9 Answer to received REJ (ISO 7776, subclause 4.4.2.2 - CCITT Recommendation X.75,
§ 2.3.5.2.1).40

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A.4.10 Receiving frames in FRMR condition (ISO 7776, subclause 4.4.4/5.6.2 - CCITT
Recommendation X.75, § 2.3.5.4/2.4.7.3). 40
A.4.11 Excessive idle channel state (ISO 7776, subclause 3.11.2 - CCITT Recommendation
X.75, § 2.3.5.5) . 40
A.4.12 SABM with P=1 (ISO 7776, subclause 5.3.1, 3rd paragraph) . 41
A.4.13 Information phase/T4 (ISO 7776, subclause 5.3.2, 2nd paragraph). 41
A.4.14 DISC with P=1 (ISO 7776, subclause 5.3.3, 2nd paragraph). 41
A.4.15 Transmitted DISC (ISO 7776, subclause 5.3.3 - CCITT Recommendation X.75, §
2.4.4.3) . 41
A.4.16 Collision of unnumbered commands (ISO 7776, subclause 5.3.5 - CCITT
Recommendation X.75, § 2.4.4.5). 41
A.4.17 Retransmission using k (ISO 7776, subclause 5.4.1 - CCITT Recommendation
max
X.75, § 2.4.5.1) . 42
A.4.18 Waiting for I-frame acknowledgement (ISO 7776, subclause 5.4.9 - CCITT
Recommendation X.75, § 2.4.5.9). 42
A.4.19 Conditions for link reset (ISO 7776, subclause 5.5 - CCITT Recommendation X.75,
§ 2.4.6). 42
A.4.20 Request for link reset by FRMR (ISO 7776, subclause 5.6.2 - CCITT Recommendation
X.75, § 2.4.7.3) . 42
A.4.21 Timer T1 (ISO 7776, subclause 5.7.1.1 - CCITT Recommendation X.75, § 2.4.8.1). 43
A.4.22 Timer T2 (ISO 7776, subclause 5.7.1.2 - CCITT Recommendation X.75, § 2.4.8.2). 43
A.4.23 Timer T3 (ISO 7776, subclause 5.7.1.3 - CCITT Recommendation X.75, § 4.8.3). 43
A.4.24 Timer T4 (ISO 7776, subclause 5.7.1.4). 43
A.4.25 N1 (ISO 7776, subclause 5.7.3 - CCITT Recommendation X.75, § 2.4.8.5). 43
A.4.26 Window size k (ISO 7776, subclause 5.7.4 - CCITT Recommendation X.75, § 2.4.8.6). 43
Annex B (informative): Comparison of the Red Book (1984) and Blue Book (1988) version of CCITT
Recommendation X.75, Layer 2. 44
B.1 Introduction. 44
B.2 Receiving acknowledgement (§ 2.4.5.5). 44
B.3 Receiving an RNR frame (§ 2.4.5.7) . 44
Annex C (informative): Valuation of the application rules for the layer 2 protocols . 45
C.1 Introduction. 45
C.1.1 Referenced documents. 45
C.1.2 Procedure . 45
C.2 Table of application rules . 46
C.3 Evaluation of the application rules. 48
C.3.1 Link layer address procedure. 48
C.3.2 Recommendation version. 48
C.3.3 STE/DTE. 48
C.3.4 Parameter negotiation . 48
C.3.5 Mode of operation. 48
C.3.6 Single link procedure . 49
C.3.7 Length of information field. 49
C.3.8 FRMR causes. 49
C.3.9 Bits X, Y, Z, W . 49
C.3.10 Invalid frame condition . 49
C.3.11 Expiration of T3. 50
C.3.12 "Corresponding response" . 50
C.3.13 Active channel state . 50
C.3.14 SABM with P=1 . 50
C.3.15 Condition for entering the disconnected phase. 50
C.3.16 Initiator of link setup . 50

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C.3.17 Timer recovery after received RNR.51
C.3.18 Sending I-frames after received RNR.51
C.3.19 N2 unsuccessful transmission attempts .51
C.3.20 Check commands in FRMR condition.52
C.3.21 Clearing of FRMR condition. 52
C.3.22 Originator of reset in FRMR condition .52
C.3.23 N2 unsuccessful transmissions of FRMR.52
C.3.24 Timer T1. 52
C.3.25 Timer T2. 53
C.3.26 Timer T3.53
C.3.27 Timer T4. 53
C.3.28 Maximum transmission number N2.53
C.3.29 Maximum frame length N1.53
C.3.30 Window size k. 54
C.3.31 Independent LAPB protocol on each channel.54
C.3.32 Use of unsolicited DM as mode setting command .54
C.3.33 Disconnecting the B-channel.55
C.3.34 Synchronising the activation of the B-channel.55
C.3.35 Acknowledging I-frames.56
C.4 Overall valuation of the interworking.56
C.4.1 Qualification table.57
C.4.2 Statement of interworking .59
Annex D (informative): Differences between the CCITT Recommendation X.224 and the International
Standard ISO/IEC 8073.60
D.1 General . 60
D.2 Additional items in CCITT Recommendation X.224.60
D.2.1 Additional annexes and appendices.60
D.2.2 Additional notes and paragraphs.60
D.3 Other differences .61
D.3.1 Protocol identifier .61
D.3.2 Sending a DC TPDU.61
D.3.3 Conformance statements. 61
D.3.3.1 Class 0/Class 2. 61
D.3.3.2 Class 0/Class 1. 61
D.3.3.3 Explicit indication of alternative class.61
D.3.4 Tables in Annex A.62
D.3.4.1 Table 17 (ISO/IEC) - table A-8 (CCITT).62
D.3.4.2 Table 19 (ISO/IEC) - table A-10 (CCITT) .62
D.3.5 Annex B (ISO/IEC 8073) - Appendix I (CCITT Recommendation X.224) .63
D.4 Conclusion for Class 0 .63
Annex E (informative): Differences between the CCITT Recommendation T.70 and ISO/IEC 8073 .64
E.1 Referenced documents .64
E.2 Introduction.64
E.3 Structure and terminology of the documents .64
E.4 Differences in the contents of CCITT Recommendation T.70 and ISO/IEC 8073.65
E.4.1 Invalid TPDUs and protocol errors .65
E.4.1.1 Invalid TPDUs .65
E.4.1.2 Protocol errors.65
E.4.2 Description of transport protocol by state tables and state transition diagrams.66

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E.4.3 Handling of Timers . 66
E.4.4 Correspondence of transport layer states in CCITT Recommendation T.70 and
ISO/IEC 8073. 66
Annex F (informative): Bibliography. 68
History. 69

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies a common set of protocols up to layer 4 of the Open Systems Interconnection (OSI)
model to be used by telematic terminals attached to the pan-European Integrated Services Digital Network
(ISDN). It bears a close relationship to CCITT Recommendation T.90 [8] and the Functional Standard
T/1112 (ENV 41 112) [20]. Full details of these and other normative references are given in Clause 2 of
this ETS.
A number of the references given in Clause 2 also involves work currently being carried out within ETSI. All
of the ETSI drafts listed should be available from your ETSI agreed National Standards Organisation
(NSO).
Reference to this ETS will be made by specifying attachment approval requirements and type approval
test suites in the terminal NETs.

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1 Scope
This ETS specifies the usage of all protocols and supplementary services up to and including layer 4 for
telematic terminals in the ISDN. The scope of this ETS is limited to demand circuit-switched calls using the
64 kbit/s unrestricted digital information bearer capability and the DTE/DTE case of the Network Layer
peer entities in B-channel connection. This ETS is based on other ETSs, International Standards or
CCITT Recommendations and, where necessary, it adds new or other requirements as application rules.
The telematic services considered are:
a) teletex;
b) facsimile group 4; and
c) ISDN syntax-based Videotex.
The ETS is applicable to terminals using either basic access or primary rate access to the ISDN. Basic
access and primary rate access refer to different ETSs for layer 1.
NOTE: In the context of this ETS, and in the case of Videotex, a terminal is either a real
terminal equipment, a Videotex service centre, a Videotex access point or a Videotex
host.
Conformance testing to verify to which extent a terminal conforms with this ETS is to be specified in a
separate ETS which will cover both the Protocol Implementation Conformance Statement (PICS)
proformas and the Abstract Test Suites (ATS).
Interworking capabilities and limitations with implementations following similar Standards such as
Functional Standards are described in informative annexes.
2 Normative references
This ETS incorporates by dated or 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] CCITT Recommendation F.184 (1988): "Operational provision for the
international public facsimile service between subscriber stations with group 4
facsimile machines (telefax 4)".
[2] CCITT Recommendation F.200 (1988): "Teletex service".
[3] CCITT Recommendation F.220 (1988): "Service requirements unique to the
processable mode number 1 (PM1) used within the teletex service".
[4] CCITT Recommendation F.230 (1988): "Service requirements unique to the
mixed mode (MM) used within the teletex service".
[5] CCITT Recommendation I.333 (1988): "Terminal selection in ISDN".
[6] CCITT Recommendation Q.931 (1988): "ISDN user-network interface layer 3
specification for basic call control".
[7] CCITT Recommendation T.70 (1988): "Network-inde
...