SIST ETS 300 719-2:1998

SLOVENSKI STANDARD
3SIST ETS 300 719-2:1998
01-oktober-1998
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Radio Equipment and Systems (RES); Private wide area paging service; Part 2:
Functional characteristics and access protocol for private wide-area paging systems on
shared channels
Ta slovenski standard je istoveten z: ETS 300 719-2 Edition 1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
3SIST ETS 300 719-2:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 719-2:1998

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SIST ETS 300 719-2:1998
EUROPEAN ETS 300 719-2
TELECOMMUNICATION July 1997
STANDARD
Source: ETSI TC-RES Reference: DE/RES-04005-2
ICS: 33.020
Key words: Paging, private, radio
Radio Equipment and Systems (RES);
Private wide area paging service;
Part 2: Functional characteristics and access protocol
for private wide-area paging systems
on shared channels
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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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 1997. All rights reserved.

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ETS 300 719-2: July 1997
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 300 719-2: July 1997
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions, abbreviations and symbols.7
3.1 Definitions .7
3.1.1 General definitions .7
3.1.2 Functional definitions.7
3.2 Abbreviations .8
3.3 Symbols .8
4 Functional characteristics.8
4.1 General .8
4.2 Correlation of system parameters.8
5 Access protocol.8
5.1 General .8
5.2 Principles .9
5.3 Procedure .9
5.3.1 Carrier sense delay .9
5.3.1.1 Definition.9
5.3.1.2 Method of measurement.9
5.3.1.3 Limit .9
5.3.2 Observation time .10
5.3.3 Initiation of the transmitter.10
5.3.4 Duration of the RF channel occupancy .10
5.4 System Identification Code (SIC).10
5.4.1 Format of the identification signal.10
5.4.2 Contents of the SIC message words.11
5.4.3 Modulation scheme for the SIC.11
Annex A (informative): Examples of sharing situations.12
Annex B (informative): System implementation information .13
B.1 Correlation of system parameters.13
B.2 System roll-out .14
B.3 Timing diagram .14
Annex C (informative): Bibliography.15
History.16

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ETS 300 719-2: July 1997
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS consists of two parts as follows:
Part 1: "Technical characteristics for private wide-area paging systems";
Part 2: "Functional characteristics and access protocol for private wide-area paging systems
on shared channels".
Provisions for ElectroMagnetic Compatibility (EMC) are defined in ETS 300 719-1 [1] and ETS 300 741.
Transposition dates
Date of adoption: 20 June 1997
Date of latest announcement of this ETS (doa): 31 October 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 April 1998
Date of withdrawal of any conflicting National Standard (dow): 30 April 1998
Introduction
Private Wide-Area Paging (PWAP) systems are basically On-Site Paging (OSP) systems with an
extended range achieved by using a higher transmitter power (for guidance 25W could be a suitable
value) and antenna location, as well as a specified receiver sensitivity. Private Wide-Area Paging systems
can operate as a set of two or more paging systems working independently from each other and having
overlapping coverage areas and sharing the same channel. Potential applications include emergency
services, hospitals and manufacturing industry that may be located at various sites within the covered
area.
These systems may use time sharing in order to increase the number of virtual available channels. The
time sharing specified in this ETS is based on a free-running system with dynamic channel access, that
requires minimum overhead and provides for maximum available net-air time.
This access protocol applies to single frequency simplex operation where the carrier sense mechanism is
available for use according to this protocol. It features dynamic channel access by applying CSMA/CA
techniques. This access protocol is applicable for:
- multiple users who do not share a common central control facility but do share a common single
radio channel, for the independent transmission of paging-messages;
- multiple users who do not share a common central control facility but do share a common single
radio channel, for the independent transmission of analogue speech and / or paging messages, and
where speech-transmissions do not have any priority over the transmission of (non-speech) paging-
messages.
This ETS does not include performance characteristics that may be required by the user or requirements
for interfacing equipment.
The conditions for licensing as well as conditions for interfacing to Public Switched Telephone Network
(PSTN) are determined by the appropriate authorities.

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1 Scope
This European Telecommunication Standard (ETS) specifies the access protocol and functional
characteristics for Private Wide-Area Paging (PWAP) systems. Such systems are characterized by one-
way data and speech transmissions on radio channels shared by different users. This ETS gives freedom
for the use of any bit rate, any type of modulation or any type of protocol which fulfils the requirements of
this ETS in order to access a shared radio channel.
In this ETS the operational aspects of the private wide-area paging service have been included.
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 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] ETS 300 719-1 (1996): "Radio Equipment and Systems (RES); Private wide-
area paging system; Part 1: Air interface specification".
[2] ITU-R Recommendation 584: "Standard codes and formats for international
radio paging".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purpose of this ETS, the following definitions apply:
3.1.1 General definitions
base station receiver: A receiver fitted with an antenna socket and intended for use in a fixed location.
This can be a stand-alone device or part of a transceiver.
bit: Binary digit.
block: The smallest quantity of information that is sent over the radio channel. A constant number of
useful bits are always sent together with the corresponding redundancy bits.
packet: One block or a contiguous stream of blocks sent by one transmitter to one particular receiver or
one particular group of receivers.
3.1.2 Functional definitions
access: To gain occupancy of the Radio Frequency (RF) channel.
cycle time (t ): The length of time between subsequent transmissions of the same system at full load.
c
transmission time slot interval (t): The duration of channel occupancy of a paging system
t
(subclause 5.3.4).
ordinal number: An integer assigned to each system to establish a sequence.
system: A service provider of private wide area paging.

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3.2 Abbreviations
For the purpose of this ETS, the following abbreviations apply:
CSMA/CA Carrier Sense Multiple Access/Collision Avoidance
EMC ElectroMagnetic Compatibility
emf electromotive force
PSTN Public Switched Telephone Network
PWAP Private Wide-Area Paging
RF Radio Frequency
RPC1 Radio Paging Code 1
RSSI Received Signal Strength Indication
SIC System Identification Code
3.3 Symbols
n number of systems
t cycle time
c
t observation interval
i
t observation time
o
t maximum observation time
o max
t transmission time slot interval
t
4 Functional characteristics
4.1 General
The private wide-area paging system is a privately owned and operated paging system to serve an area
within and beyond the boundary of the site. The intended free field range of a system is approximately
10 km (to comprise a city and its near surroundings). The radio channel may be either shared by several
systems or dedicated to a single system.
The radio part of a private wide-area paging system as defined in this ETS is made up exclusively from
equipment that conforms with ETS
...