SIST ETS 300 822:2001

• Abstract:

  To specify how ISDN services can be provided over a DECT link. This document describes the DECT intermediate system reference configuration which is used where the DECT Fixed-System (DFS) and DECT Portable-System (DPS) together form an intermediate system to a separate ISDN-TE at the portable side.

• Status: Published
• Publication Date: 31-Aug-2001
• ICS: 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT)
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2001
• Due Date: 01-Sep-2001
• Completion Date: 01-Sep-2001
• Ref Project: ETSI ETS 300 822 ed.1 (1998-04) - Digital Enhanced Cordless Telecommunications (DECT); Integrated Services Digital Network (ISDN); DECT/ISDN interworking for intermediate system configuration; Interworking and profile specification

SIST ETS 300 822:2001 is the Slovenian adoption of ETS 300 822 Edition 1 from ETSI. It specifies how Integrated Services Digital Network (ISDN) services are carried over a Digital Enhanced Cordless Telecommunications (DECT) link in the intermediate system configuration, so that ISDN terminals can get cordless access to an ISDN infrastructure. The standard is aimed at DECT/ISDN interworking between the DIFS and DIPS on the fixed and portable sides.

What does SIST ETS 300 822:2001 specify?

SIST ETS 300 822:2001 specifies the DECT/ISDN interworking profile for the intermediate system configuration. It is based on the DECT Common Interface (CI) parts 1 to 8 and is intended to give transparent access to ISDN services over a DECT air interface.

The scope covers both public ISDN and private ISDN. It supports bearer services for speech, 3,1 kHz audio, unrestricted 64 kbit/s data, packet data and user signalling bearer service, so the reader can see which ISDN service types are intended to work over DECT.

The document is organized into scope, normative references, definitions and abbreviations, interworking requirements, protocol architecture, interworking procedures, physical layer procedures, MAC layer procedures, DLC layer procedures, network layer procedures, IWU procedures, dynamic switching procedures, maintenance, coding, and annexes.

Annex	What it covers
A	Modifications to the DECT MAC, DLC and NWK layers for DECT/ISDN intermediate system operation, including LU7 and LU8 related changes.
B	C-plane switching procedures and collision scenarios, plus LU service switch collision cases.
D	LU 7 service establishment and synchronization example.

What are the key requirements of SIST ETS 300 822:2001?

SIST ETS 300 822:2001 defines how the ISDN side and the DECT side are tied together, how calls are set up and released, and how radio and data-link behavior must support that interworking. The most important practical point is that implementers have to keep the ISDN call control visible across the DECT link while choosing the right DECT bearer and channel behavior for each service.

Interworking architecture and service mapping

Clause 5 states that the protocol architecture model is based on ECMA TR/44 and that ISDN layer 1 and layer 2 are terminated in the DIFS and DIPS. ISDN layer 3 messages are relayed across the DECT C-plane using the {IWU-INFO} message and the <> information element, so the DECT side carries the ISDN call control without changing its meaning.

Clause 6 explains the mapping principles for signalling, B-channel and U-plane handling. In practice, the DIFS analyses the <> information element in a {SETUP} message, decides whether a U-plane is needed, and asks the DIPS to create the required DECT connection.

The bearer mapping in Table 2 is a core implementation guide. It links ISDN bearer services to DECT U-plane services such as LU1, LU7 and LU8, which tells the reader what DECT bearer to expect for speech, audio, unrestricted data or packet-mode traffic.

Radio, MAC and DLC behavior

Clause 7 sets the radio-side requirements that matter for usable cordless access. The physical layer shall support full-slot and double-slot packets, the nominal Minimum Normal Transmit Power (NTP) shall be greater than 80 mW per simultaneously active transmitter, and radio receiver sensitivity shall be -86 dBm or better.

Clause 7 also requires Z-field transmission, sliding collision detection and a synchronization window of at least ±4 bits for some bearers and ±10 bits for others. These points matter because they govern whether the equipment can maintain timing and detect corrupted packets in real traffic.

Clause 8 defines the MAC behavior for signalling, paging, bearer setup, release and dynamic C-plane switching. A useful operational rule is that the bearer is released if the correct RFPI with a correct CRC is not received within T201, so a bearer that loses its identification has to be torn down.

Clause 9 covers Class B link establishment, acknowledged information transfer, segmentation, link suspension and resumption, plus the LU7 and LU8 U-plane services. For a designer or tester, this is where retransmission behavior, frame formats and user-data transport are specified.

Network, IWU and management behavior

Clause 10 covers Network layer signalling channel establishment, D-channel data transfer, U-plane establishment and switching to B-channels, release procedures, and B-channel switching. It also lists mobility and security features and ties them to the procedures of EN 300 444, so implementers have a clear place to look for authentication, location registration and encryption-related behavior.

Clause 11 defines the IWU procedures, including Layer 3 monitoring, call-state handling, supervision and the reactions when DECT resources are missing. It also includes call hold, fall back procedure and terminal portability, which matters when the system has to survive limited radio resources or changing attachment conditions.

Clause 13 requires the DIFS and DIPS to exchange operation and maintenance information with an <> IE using the operation and maintenance protocol discriminator. Clause 14 defines the coding rules for IWU-INFOrmation and IWU-TO-IWU messages, including segmentation when the information field does not fit into one information element.

What terms does SIST ETS 300 822:2001 define?

SIST ETS 300 822:2001 defines the terms it uses so that the DECT and ISDN roles are not ambiguous during implementation or testing.

• Bearer service - a telecommunication service that provides a defined capability for transmitting signals between user-network interfaces.
• C-plane - the DECT control plane that carries internal protocol control and may also carry some external user information.
• U-plane - the DECT user plane that carries end-to-end user information and user control.
• DECT intermediate fixed system (DIFS) - the logical group of functions between the DI reference point and the fixed-side ISDN reference point.
• DECT intermediate portable system (DIPS) - the logical group of functions between the DI reference point and the portable-side ISDN S reference point.
• Interworking Unit (IWU) - the unit that interconnects subnetworks and contains the functions needed for that interworking.
• Portable radio Termination (PT) - the logical DECT functions on the portable side of the air interface.

Who uses SIST ETS 300 822:2001?

SIST ETS 300 822:2001 is used by DECT and ISDN equipment designers, especially engineers working on Fixed Part, Portable Part and Interworking Unit implementations. It is also used by network operators, enterprise telecom teams, and test laboratories that need cordless access to public ISDN or private ISDN infrastructure.

Quality managers and buyers use it to check whether equipment claims about interoperability, bearer support, signalling behavior and radio performance match the DECT/ISDN profile. It is most relevant where a DECT installation has to preserve ISDN call control and bearer services across a cordless link.

What changed in SIST ETS 300 822:2001 from the previous edition?

SIST ETS 300 822:2001 is identical to ETS 300 822 Edition 1.

Which standards are used with SIST ETS 300 822:2001?

SIST ETS 300 822:2001 is built on the DECT Common Interface and on ISDN layer and service references.

• EN 300 175-1 to EN 300 175-8 - provide the DECT Common Interface baseline for overview, physical layer, MAC, DLC, NWK, identities and addressing, security features, and speech coding.
• ETS 300 012 - supplies the ISDN layer 1 specification and test principles used by the intermediate system.
• ETS 300 402-2 - supplies the ISDN DSS1 data link layer used for ISDN layer 2 behavior.
• EN 300 403-1 - supplies the DSS1 network layer for circuit-mode basic call control.
• EN 300 196-1 - supplies the generic functional protocol for supplementary services.
• EN 300 444 - supplies the DECT Generic Access Profile used for the mobility and security procedures referenced by this standard.
• ETS 300 108, ETS 300 109 and ETS 300 110 - describe the ISDN bearer services for unrestricted 64 kbit/s, speech and 3,1 kHz audio that the mapping in this standard relies on.
• CCITT G.711, CCITT G.726 and CCITT G.821 - provide speech coding, ADPCM coding and error performance references used in the U-plane discussion.
• ITU-T I.411 - gives ISDN user-network interface reference configurations.
• EN 300 434-1 - gives the related DECT/ISDN interworking specification for the end system configuration.

What does the SIST ETS 300 822:2001 document contain?

SIST ETS 300 822:2001 contains the reference configurations, service requirements, protocol architecture model, and detailed procedures that make ISDN over DECT work in the intermediate system configuration. It includes tables for bearer-service mapping and for mobility and security feature status, plus figures that show the C-plane and U-plane models, setup and release flows, and the FU8 frame structure for LU8.

The document also contains the message and information element coding needed for IWU-INFO and IWU-TO-IWU exchange, including separate coding for C-plane, U-plane and operation and maintenance use. Annex A describes the required modifications to the DECT layers, Annex B analyzes switching collision scenarios, and Annex D illustrates LU 7 service establishment.

SLOVENSKI STANDARD
01-september-2001
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH'(&7'LJLWDOQRRPUHåMH]
LQWHJULUDQLPLVWRULWYDPL,6'10HGVHERMQRGHORYDQMH'(&7,6'1]DYPHVQH
VLVWHPH0HGVHERMQRGHORYDQMHLQSURILOVSHFLILNDFLM
Digital Enhanced Cordless Telecommunications (DECT); Integrated Services Digital
Network (ISDN); DECT/ISDN interworking for intermediate system configuration;
Interworking and profile specification
Ta slovenski standard je istoveten z: ETS 300 822 Edition 1
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 822
TELECOMMUNICATION April 1998
STANDARD
Source: DECT Reference: DE/DECT-030039
ICS: 33.020
Key words: DECT, ISDN, interworking, profile, radio
Digital Enhanced Cordless Telecommunications (DECT);
Integrated Services Digital Network (ISDN);
DECT/ISDN interworking for intermediate system configuration;
Interworking and profile specification
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.fr - http://www.etsi.org
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 1998. All rights reserved.

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ETS 300 822: April 1998
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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ETS 300 822: April 1998
Contents
Foreword .9
Introduction.9
1 Scope .11
2 Normative references.11
3 Definitions and abbreviations .13
3.1 Definitions .13
3.2 Abbreviations .15
3.3 Symbols .16
4 Interworking requirements.17
4.1 Reference configurations and interfaces .17
4.1.1 Reference configurations .17
4.1.2 ISDN interfaces .17
4.2 Service requirements.18
4.2.1 Bearer service requirements .18
4.2.2 Teleservice requirements.18
4.2.3 General aspects on error performance .18
4.2.4 Supplementary service requirements.19
5 Protocol architecture .20
5.1 General .20
6 Interworking procedures.21
6.1 Procedural overview .21
6.2 DECT signalling link management.22
6.2.1 General description .22
6.2.2 Activation from the ISDN network .22
6.2.3 Activation from the ISDN terminal .23
6.2.4 Release of the signalling link.24
6.3 U-plane and B-channel management.24
6.3.1 U-plane management.24
6.3.2 B-channel management .27
6.4 L2 address management.28
6.5 Outgoing call procedures.28
6.6 Incoming call procedures.30
6.6.1 Point to multipoint configuration .30
6.6.2 Point to point configuration.32
6.7 Release procedures.34
6.7.1 Release from the ISDN network.34
6.7.2 L2 disconnection from the ISDN network (point to point only) .35
6.7.3 Release from the ISDN terminal .36
6.7.4 L2 disconnection from the ISDN terminal.37
7 Physical layer procedures .37
7.1 General requirement.37
7.2 Minimum Normal Transmit Power (NTP).37
7.3 Radio receiver sensitivity .37
7.4 Z-field requirement.37
7.5 Sliding collision detection.38
7.6 Synchronization window.38
8 MAC layer procedures.38

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ETS 300 822: April 1998
8.1 MAC layer signalling procedures. 38
8.1.1 Downlink broadcast . 38
8.1.1.1 NT message. 38
8.1.1.2 QT- static system information . 39
8.1.1.3 QT - FP capabilities . 39
8.1.1.4 QT Extended FP capabilities . 40
8.1.1.5 QT - SARI list contents . 40
8.1.1.6 Paging broadcast: short page . 41
8.1.1.7 Paging broadcast: zero page . 42
8.1.2 Activation of the signalling connection. 42
8.1.2.1 General requirement . 42
8.1.2.2 Activation from the ISDN network. 42
8.1.2.3 Activation from the ISDN terminal. 44
8.1.2.4 MBn advanced connection control messages . 46
8.1.2.5 Associated procedures . 46
8.1.2.5.1 Timer T200 management. 46
8.1.2.5.2 Counter N200 management. 46
8.1.2.6 Exceptional case. 47
8.1.2.6.1 Bearer setup fails or timer T200 expiry 47
8.1.3 Release of signalling link . 48
8.1.3.1 MBn release message . 50
8.1.4 Dynamic C-plane switching: MAC layer procedures. 50
8.1.4.1 Dynamic switching CF to CS: only DIFS initiated. 50
8.1.4.2 Dynamic switching CS to CF: DIPS initiated. 53
8.1.4.3 Dynamic switching CS to C : DIFS initiated. 54
F
8.1.4.4 Dynamic switching CS x to CS y: only DIFS initiated. 57
8.1.4.5 Dynamic switching CS x double to CS x full: only DIFS
initiated. 58
8.1.4.6 Associated procedures . 60
8.1.4.6.1 Associated procedures: DIFS side. 60
8.1.4.6.2 Associated procedures: DIPS side. 60
8.2 MAC Layer U-plane procedures. 60
8.2.1 U-plane connection setup procedure. 60
8.2.1.1 MBn messages advanced connection control . 62
8.2.2 U-plane connection release procedure. 62
8.2.2.1 MBn release message . 63
8.3 Signalling and U-plane connections: Timer T201 management . 64
8.3.1 Timer T201 . 64
8.3.2 Timer T201 expiry. 64
9 DLC layer procedures. 64
9.1 DLC layer signalling procedures . 64
9.1.1 Class B link establishment. 64
9.1.2 Associated procedure. 66
9.1.2.1 Timer management. 66
9.1.2.2 Re-transmission counter management. 66
9.1.2.3 Multiple frame operation variables . 66
9.1.3 Class B acknowledged information transfer . 67
9.1.3.1 Acknowledgement with an I_frame. 67
9.1.3.2 Acknowledgement with a RR_frame. 68
9.1.3.3 Acknowledgement with an RNR_frame . 70
9.1.3.4 Acknowledgement with an REJ_frame . 71
9.1.4 Segmentation of NWK layer message. 71
9.1.5 Associated procedure(s). 71
9.1.5.1 Timer management. 71
9.1.5.2 Timer expiry. 72
9.1.6 Link suspension and resumption . 72
9.1.7 Link release . 72
9.2 DLC Layer U-plane procedures. 73
9.2.1 FU1 frame operation. 73
9.2.2 LU7 data bearer service . 73
9.2.3 LU8 service. 74
9.2.3.1 Physical layer service. 74

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ETS 300 822: April 1998
9.2.3.2 MAC layer service.74
9.2.3.3 DLC layer service .74
10 Network layer procedures .74
10.1 Network layer C-plane procedures .74
10.1.1 General overview.74
10.1.2 Establishment of the signalling channel .75
10.1.2.1 Indirect DIFS initiated link establishment.75
10.1.2.2 Direct DIPS initiated link establishment.76
10.1.3 Transmitting of D-channel data .77
10.2 Network Layer U-plane procedures .78
10.2.1 Establishment of DECT-U-planes and their switching to B-channels .78
10.2.1.1 Establishment of the DECT-U-planes.79
10.2.1.2 Switching of U-plane to B-channel.80
10.2.2 Release procedures .82
10.2.3 Switching of the B-channel.82
10.3 Mobility and security features.83
10.3.1 Mobility and security features: additional requirements.84
11 IWU procedures .84
11.1 Link association entity.84
11.1.1 General.84
11.1.2 Normal procedures.84
11.1.2.1 Transfer of broadcast L3 messages.84
11.1.2.2 Transfer of L 3 messages on a point-to-point L 2 link .84
11.1.2.2.1 LA-establishment .84
11.1.2.2.2 LA data transfer .85
11.1.2.2.3 LA release.85
11.1.3 Exceptional handling and supervision .85
11.1.3.1 Rejection of ISDN-L2 establishment.85
11.1.3.2 Rejection of a transfer request at the C-plane-channel.85
11.1.3.3 CEI-problems.86
11.1.3.4 L2-command coding problems .86
11.1.4 Supervisory.86
11.1.4.1 Monitoring of ISDN-L2 links by the DIPS.86
11.1.5 LAE parameters .86
11.2 Layer 3 monitoring .86
11.3 State machine.87
11.3.1 General overview.87
11.3.2 IWU call states .87
11.3.3 State transitions.87
11.3.4 Parameters.88
11.4 Actions upon missing DECT resources .89
11.4.1 General.89
11.4.2 Actions of the DIFS .89
11.4.2.1 The signalling link cannot be established .89
11.4.2.1.1 Point-to-point configuration.89
11.4.2.1.2 Point-to-multipoint configuration .89
11.4.2.2 The signalling link is lost.89
11.4.2.3 An U-plane-channel cannot be established.89
11.4.2.3.1 Point-to-point configuration.89
11.4.2.3.2 Point-to-multipoint configuration .89
11.4.2.4 An U-plane-channel is lost.89
11.4.2.4.1 Point-to-point configuration and
outgoing call in a point-to-multipoint
configuration .89
11.4.2.4.2 Point-to-multipoint configuration,
incoming call .90
11.4.3 Actions of the DIPS .90
11.4.3.1 The signalling link cannot be established or is lost.90
11.4.3.2 An U-plane-channel cannot been established.90
11.4.3.3 An U-plane-channel is lost.90
11.5 Other interworking functions .90

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ETS 300 822: April 1998
11.5.1 Call hold. 90
11.5.2 Fall back procedure . 90
11.5.3 Terminal portability . 90
12 Dynamic switching procedures. 91
12.1 Dynamic switching procedures between DECT signalling channels. 91
12.1.1 First establishment of signalling bearer (CF). 92
12.1.2 General description of the C-plane switching procedure. 93
12.1.3 Switching from CF to CS channel, only DIFS initiated. 93
12.1.4 Switching between CS and CS channel, only DIFS initiated . 94
12.1.5 Switching from CS to CF, DIFS initiated. 95
12.1.6 Switching from CS to CF, DIPS initiated. 96
12.1.7 LCN - management . 97
12.1.8 Conditions for dynamic signalling channel switching. 98
12.2 Dynamic switching procedures between DECT U-planes. 98
12.2.1 Dynamic switching procedures from LU1 to LU7 . 98
12.2.2 Dynamic switching procedures from LU7 to LU1 . 101
12.2.2.1 Procedure description . 101
12.2.2.1.1 Associated procedures. 105
12.2.3 Dynamic switching procedures from LU1 to LU8 . 105
12.2.4 Dynamic switching procedures from U-plane LU8 to LU1. 106
12.2.5 Dynamic switching procedures from LU7 to LU8 . 107
12.2.5.1 Procedure description . 108
12.2.6 Dynamic switching procedures from LU8 to LU7 . 109
12.2.6.1 Procedure description . 110
13 Maintenance . 111
13.1 Exchange of operation and maintenance information. 111
14 Coding . 112
14.1 IWU-INFOrmation for DECT/ISDN intermediate system . 112
14.2 IWU to IWU for DECT/ISDN intermediate system. 112
14.2.1 C-plane specific . 113
14.2.1.1 Coding for "release required". 113
14.2.2 U-plane specific . 114
14.2.3 Operation and maintenance specific . 114
Annex A (informative): Modifications to EN 300 175. 116
A.1 Modifications to the MAC layer (EN 300 175-3 [3]) . 116
A.1.1 Specific for U-plane switching procedures. 116
A.1.2 Specific for C-plane switching procedure. 116
A.1.3 General. 117
A.2 Modifications to the DLC layer (EN 300 175-4) . 117
A.2.1 General. 117
A.2.1.1 LU7 64 kbit/s data bearer service. 117
A.2.1.2 LU8 bearer service . 118
A.2.1.2.1 Physical layer service. 118
A.2.1.2.2 MAC layer service . 118
A.2.1.2.3 DLC layer service. 119
A.3 Modifications to the NWK layer (EN 300 175-5). 119
A.3.1 General. 119
A.3.3 Amendment to basic service IE. 120
Annex B (informative): Handover and collision scenarios . 121
B.1 C-plane switching procedures . 121
B.1.1 C-plane switching: handover collision scenarios. 121
B.1.1.1 CF to CS switching procedure: concurrent handover scenario . 121
B.1.1.2 CS to CF switching procedure: concurrent handover scenario . 122
B.1.1.3 Dynamic switching CF to CS bearer handover collision . 123

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ETS 300 822: April 1998
B.1.1.4 Conclusions.124
B.1.2 C-plane switching: ciphering procedure collision scenarios .124
B.1.2.1 Dynamic switching CF to CS ciphering procedure collision .124
B.2 LU service switch .126
B.2.1 General .126
B.2.2 Switching from LU1 to LU7: bearer handover collision.126
Annex C (informative): Examples for segmentation of ISDN messages.127
Annex D (Informative): LU 7 service establishment .128
History.129

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ETS 300 822: April 1998
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ETS 300 822: April 1998
Foreword
This European Telecommunication Standard (ETS) has been produced by the Digital Enhanced Cordless
Telecommunications (DECT) Project of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption of this ETS: 20 March 1998
Date of latest announcement of this ETS (doa): 31 July 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1999
Date of withdrawal of any conflicting National Standard (dow): 31 January 1999
Introduction
For interworking between an Integrated Services Digital Network (ISDN) and a DECT system, two profiles
have been defined. The first profile is the DECT/ISDN profile for end system configuration. The second
profile is the DECT/ISDN profile for intermediate system configuration. The first profile is also called the
"ISDN Access Profile (IAP)". The second profile is also called the "Intermediate ISDN access Profile (IIP)".
The IAP applies when a Fixed Part (FP) and a Portable Part (PP) together constitute an ISDN terminal.
The ISDN applications and any supplementary services are located in the PP (no Interworking Unit (IWU)
in the PP). The FP maps the received layer 3 messages at the ISDN interface to the DECT layer 3
messages and vice-versa.
The IIP applies when a FP and a PP together constitute a gateway between an ISDN network and an
ISDN terminal. The FP and the PP have an IWU, which maps the messages between the ISDN interface
and the DECT air interface.
This ETS specifies the DECT/ISDN profile for intermediate system configuration only. For details on
DECT/ISDN profile for end system configuration, see EN 300 434-1 [28].
This ETS specifies how ISDN services are provided over the DECT air interface.
One of the main objectives is to describe how the ISDN services are mapped across the DECT air
interface in a formal way, so that equipment interoperability of different manufacturers' equipment can be
achieved.
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ETS 300 822: April 1998
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ETS 300 822: April 1998
1 Scope
This European Telecommunication Standard (ETS) specifies how Integrated Services Digital Network
(ISDN) services can be provided over Digital Enhanced Cordless Telecommunications (DECT). It is based
on DECT Common Interface (CI) specification EN 300 175, parts 1 to 8 [1] to [8], to enable ISDN
terminals to have cordless access to an ISDN infrastructure. Both public ISDN and private ISDN are within
the scope of this ETS.
The user has transparent access to the ISDN services and functions. In respect to bearer services, the
following are supported: speech, 3,1 kHz audio, unrestricted 64 kbit/s data, packet data and user
signalling bearer service.
The DECT intermediate system configuration differs from the DECT end system configuration as follows.
The intermediate system is used to enable ISDN terminals to have cordless access to an ISDN
infrastructure via a DECT air interface. The end system is used where the DECT Fixed Part (FP) and the
DECT Portable Part (PP) together form an end system with the behaviour of an ISDN Terminal Equipment
(TE).
2 Normative references
This ETS 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 ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] EN 300 175-1: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 1: Overview".
[2] EN 300 175-2: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 2: Physical Layer (PHL)".
[3] EN 300 175-3: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 3: Medium Access Control (MAC) layer".
[4] EN 300 175-4: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 4: Data Link Control (DLC) layer".
[5] EN 300 175-5: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 5: Network (NWK) layer".
[6] EN 300 175-6: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 6: Identities and addressing".
[7] EN 300 175-7: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 7: Security features".
[8] EN 300 175-8: "Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI); Part 8: Speech coding and transmission".
[9] ETS 300 108: "Integrated Services Digital Network (ISDN); Circuit-mode
64 kbit/s unrestricted 8 kHz structured bearer service category; Service
description".
[10] ETS 300 109: "Integrated Services Digital Network (ISDN); Circuit-mode
64 kbit/s 8 kHz structured bearer service category usable for speech information
transfer Service description".
[11] ETS 300 110: "Integrated Services Digital Network (ISDN); Circuit-mode
64 kbit/s 8 kHz structured bearer service category usable for 3,1 kHz audio
information transfer Service description".

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ETS 300 822: April 1998
[12] ETS 300 475-1: "Private Telecommunication Network (PTN); Reference
configuration; Part 1: Reference configuration for PTN eXchanges
(PTNX) [ISO/IEC 11579-1 (1994), modified]".
[13] ETS 300 012: "Integrated Services Digital Network (ISDN); Basic user-network
interface; Layer 1 specification and test principles".
[14] EN 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-
mode basic call control; Part 1: Protocol specification [ITU-T Recommendation
Q.931 (1993), modified]".
[15] EN 300 444: "Digital Enhanced Cordless Telecommunications (DECT); Generic
Access Profile (GAP)".
[16] ETS 300 192: "Private Telecommunication Network (PTN); Signalling protocol at
the S-reference point; Circuit mode basic services".
[17] EN 300 171: "Private Integrated Services Network (PISN); Specification,
functional models and information flows; Control aspects of circuit mode basic
services".
[18] CCITT Recommendation I.232.1 (1988): "Virtual call and permanent virtual
circuit bearer service category".
[19] ETS 300 049: "Integrated Services Digital Network (ISDN); ISDN Packet Mode
Bearer Service (PMBS); ISDN Virtual Call (VC) and Permanent Virtual Circuit
(PVC) bearer services provided by the D-channel of the user access - basic and
primary rate".
[20] ETS 300 048: "Integrated Services Digital Network (ISDN); ISDN Packet Mode
Bearer Services (PMBS); ISDN Virtual Call (VC) and Permanent Virtual Circuit
(PVC) bearer services provided by the B-channel of the user access - basic and
primary rate".
[21] EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional
protocol for the support of supplementary services; Digital Subscriber Signalling
System No. one (DSS1) protocol; Part 1: Protocol specification".
[22] ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Data link layer; Part 2: General
protocol specification [ITU-T Recommendation Q.921 (1993), modified]".
[23] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[24] CCITT Recommendation G.726 (1991): "40, 32, 24, 16 kbit/s adaptive
differential pulse code modulation (ADPCM)".
[25] ECMA TR/44 (1989): "An architectural framework for private networks".
[26] CCITT Recommendation G.821 (1988): "Error performance of an international
digital connection operating at a bit rate below the primary rate and forming part
of an integrated services digital network".
[27] ITU-T Recommendation I.411: (1993): "ISDN user-network interfaces -
Reference configurations".
[28] EN 300 434-1: "Digital Enhanced Cordless Telecommunications (DECT);
Integrated Services Digital Network (ISDN); DECT/ISDN interworking for end
system configuration; Part 1: Interworking specification".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
bearer service: A type of telecommunication service that provides a defined capability for the
transmission of signals between user-network interfaces.
NOTE 1: The DECT user-network interface corresponds to the top of the network layer (layer 3).
broadcast: A simplex point-to-multipoint mode of transmission.
C-plane: The control plane of the DECT protocol stacks, which contains all of the internal DECT protocol
control, but may also include some external user information.
NOTE 2: The C-plane stack always contains protocol entities up to and including the network
layer.
call: All of the Network (NWK) layer processes involved in one network layer peer-to-peer association.
NOTE 3: Call may sometimes be used to refer to processes of all layers, since lower layer
processes are implicitly required.
DECT intermediate fixed system: A logical grouping that contains all the functions between the DECT DI
reference point and the reference point on the fixed side of the DECT air interface.
NOTE 4: The DECT Intermediate Fixed System (DIFS) = FT + (local network up to the fixed
side ISDN reference point (including fixed side IWU));
DECT intermediate portable system: A logical grouping that contains all the functions between the
DECT DI reference point and the ISDN S reference point on the portable side of the DECT air interface.
NOTE 5: The DECT Intermediate Portable System (DIPS) = PT + (PA (Portable Application) up
to the portable side ISDN S reference point (including portable side IWU)).
DECT network: A network that uses the DECT air interface to interconnect a local network to one or
more portable applications. The logical boundaries of the DECT network are defined to be at the top of the
DECT network layer.
NOTE 6: A DECT Network (DNW) is a logical grouping that contains one or more fixed radio
terminations plus their associated portable radio termination. The boundaries of the
DECT network are not physical boundaries.
end system: A logical grouping that contains application processes and supports telecommunication
services.
NOTE 7: From the Open Systems Interconnection (OSI) point of view, end systems are
considered as sources and sinks of information.
equipment interoperability: The capability of fixed and PPs supplied by different manufacturers to
interoperate in a multivendor environment.
Fixed Part (DECT Fixed Part) (FP): A physical grouping that contains all of the elements in the DECT
network between the local network and the DECT air interface.
NOTE 8: A DECT FP contains the logical elements of at least one fixed radio termination, plus
additional implementation specific elements.
Fixed radio Termination (FT): A logical group of functions that contains all of the DECT processes and
procedures on the fixed side of the DECT air interface.

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NOTE 9: A fixed radio termination only includes elements that are defined in the DECT CI
standard. This includes radio transmission elements together with a selection of layer
2 and layer 3 elements.
Generic Access Profile (GAP): The profile applicable to all DECT Portable radio Terminations (PTs) and
Fixed radio Terminations (FTs) which are subject to CTR 10 (i.e. 3,1 kHz telephony teleservice). The GAP
ensures air interface interoperability of DECT equipment capable of 3,1 kHz telephony applications, in
such a way that any DECT Portable radio Termination (PT) conforming to the GAP is interoperable with
any DECT FT conforming to the GAP.
incoming call: A call received at a PP.
Interworking Unit (IWU): A unit that is used to interconnect subnetworks.
NOTE 10: The IWU will contain the interworking functions necessary to support the required
subnetwork interworking.
ISDN access profile: A defined part of the DECT/ISDN interworking standard that ensures interoperability
between FPs and PPs for the access of ISDN services.
local network: A telecommunication network capable of offering local telecommunication services.
NOTE 11: The term does not include legal or regulatory aspects, nor does it indicate if the
network is a public network or a private network.
MAC Connection (CONNECTION): An association between one source Medium Access Control (MAC)
Multi-Bearer Control (MBC) entity and one destination MAC MBC entity. This provides a set of related
MAC services (a set of logical channels), and it can involve one or more underlying MAC bearers.
outgoing call: A call originating from a PP.
paging: The process of broadcasting a message from a DECT FP to one or more DECT PPs.
NOTE 12: Different types of paging message are possible. For example, the {LCE_REQUEST-
PAGE} message orders the recipient to respond with a call setup attempt.
portable application: A logical grouping that contains all the elements that lie beyond the DECT network
boundary on the portable side.
NOTE 13: The functions contained in the portable application may be physically distributed, but
any such distribution is invisible to the DECT network.
Portable Part (DECT Portable Part) (PP): A physical grouping that contains all elements between the
user and the DECT air interface. PP is a generic term that may describe one or several physical pieces.
NOTE 14: A DECT PP is logically divided into one PT plus one or more portable applications.
Portable radio Termination (PT): A logical group of functions that contains all of the DECT processes
and procedures on the portable side of the DECT air interface.
NOTE 15: A portable radio termination only includes elements that are defined in the DECT CI
standard. This includes radio transmission elements (layer 1) together with a selection
of layer 2 and layer 3 elements.
Radio Fixed Part (RFP): One physical sub-group of a FP that contains all the (REP)radio end points (one
or more) that are connected to a single system of antennas.
segment: One of the pieces of data that is produced by the process of segmentation.
NOTE 16: In general, one segment only represents a portion of a complete message.

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ETS 300 822: April 1998
segmentation: The process of partitioning one service data unit from a higher layer into more than one
protocol data unit. The reverse process is assembly.
supplementary service: A service that modifies or supplements a basic telecommunication service.
teleservice: A type of telecommunication service that provides the complete capability, including terminal
equipment functions, for communication between users, according to protocols that are established by
agreement.
U-plane: The user plane of the DECT protocol stacks. This plane contains most of the end-to-end
(external) user information and user control.
NOTE 17: The U-plane protocols do not include any internal DECT protocol control, and it may be
null at the network layer and at the Data Link Control DLC layers for some services.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
BA Basic Access
C C reference point
C/L Connectionless mode
C/O Connection Oriented mode
CC Call Control
CEI Connection Endpoint Identifier
CI Common Interface
CLMS Connectionless Message Service
COMS Connection Oriented Message Service
CRSS Call Related Supplementary Services
DECT Digital Enhanced Cordless Telecommunications
DI DECT reference point for Intermediate system
DIFS DECT Intermediate Fixed System
DIPS DECT Intermediate Portable System
DLC Data Link Control
DNW DECT Network
DTMF Dual Tone Multi-Frequency
ECN Exchange Connection Number
ES End System
FEC Forward Error Control
FP Fixed Part
FT Fixed radio Termination
GAP Generic Access Profile
IA Interface Adapter
IE Information Element
IFS Intermediate Fixed System
IPS Intermediate Portable System
ISDN Integrated Services Digital Network
IWU Interworking Unit
LA Link Association
LAE Link Association Entity
LCE Link Control Entity
LCN Logical Connection Number
LLME Lower Layer Management Entity
LNW Local Network
LSb Least Significant bit
MAC Medium Access Control
MBC Multi-Bearer Control
MCEI MAC Connection Endpoint Identifier
MM Mobility Management
MoU Memorandum of Understanding
MSB Most Significant Bit
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ETS 300 822: April 1998
MUX MUltipleXer
NT1 Network Termination 1
NT2 Network Termination 2
NTP Normal Transmit Power
NWK Network
OSI Open Systems Interconnection
P P reference point
PA Portable Application
PABX Private Automatic Branch Exchange
PARI Primary Access Rights Identity
PBX Private Branch Exchan
...