PHS MoU Document
B-IW0.01-01-TS
Title: Public Personal Handy-Phone System : Definitions and General
Principles for Public PHS Network
Version: 01
Date: December 19, 1997
PHS MoU Classification: Unrestricted
List of contents:
1.
2.
3.
4.
5.
6.
7.

Introduction
Scope
Definitions
Telecommunication services to be supported by public PHS network
interworking configurations
Public PHS network interworking configurations
Interworking functional requirements – General aspects
General aspects of selection mechanisms for interworking functions

Annex A Glossary and Abbreviations

Number of pages: 14

PHS MoU Group
c/o Association of Radio Industries and Businesses (ARIB)
14F, Nittochi Bldg., 4-1, Kasumigaseki 1-choume, Chiyoda-ku, Tokyo 100, Japan
TEL +81-3-5510-8599 FAX +81-3-3592-1103© PHS MoU Group1997

PHS MoU Document
B-IW0.01-01-TS
Version01

History of Revised Versions
Date
OutlineDec 19, 1997

EstablishedB-IW-0.01-01-TS
Public Personal Handy-Phone System:
Definitions And General Principles For Public PHS Network
Interworking/Internetworking< Summary >1. Relationship with International Standards
This specification specifies definitions and general principles for public PHS network
interworking/internetworking based on ITU-T Recommendation I.510 which specifies definitions andgeneral principles for ISDN interworking/internetworking.
2. Differences to /from International Recommendations(1) Network model and terminology
ITU-T Recommendation I.510 specifies general principle for interworking between ISDNs, between
ISDNs and other networks, and internal to an ISDN. This specification changes this model such that
one of the interworking networks is a public PHS network and the other network is a public PHS
network or an ISDN or an PSTN. The differences of model and terminology from ITU-T
Recommendation I.510 are summarized in Table Summary-1/B-IW0.01.
(2) Specifications
The differences of specifications form ITU-T Recommendation I.510 are summarized in Table
Summary -2/B-IW0.01.
The following specifications have been deleted from ITU-T Recommendation I.510.
- Packet mode bearer services;- Telex and Teletex teleservices;- Multi-use bearer services.
3. References
ITU-T Recommendation
PHS MoU Documents

I.5xx series
B-IF2.xx, B-IF3.xx, B-IWx.xx series

4. Items for Further Study
None.

B-IW-0.01-01-TS(1)

Table Summary-1/B-IW0.01

Item
Interworking
network

Differences of model and Terminology from ITU-T
Recommendation I.510

I.510

This specification

Both side are ISDNs, ISDN and other One of the interworking networks is a public
network, internal to an ISDNPHS network, and the other one is othernetwork ( ISDN or PSTN ).

model
Network

ISDN and ISDN/other network.

Public PHS network
network/other network.

ISDN - in a context of service

public PHS networkTEpublic PS

Kx, NxIF3(Kx), IF3(Nx)

ITU-T Recommendations

PHS MoU Documents

I.510

B-IW0.01

I.520

B-IW2.00

configuration

andPublicPHSfigureTerminology

Reference

Table Summary-2/B-IW0.01

Differences of specifications from ITU-T
Recommendation I.510

Section
5. Network support of telecommunication service

Differences
Interworking to CSPDN and PSPDN is deleted in table 5-1

6.2.2 Connection types for interworking between public Items relating to packet mode are deleted.
PHS networks
6.3.2 Connection types for interworking between public Items for interworking to CSPDN, PSPDN, telex and
PHS network and other network
private networks are deleted.
Items for interworking between public PHS network and
PSTN is added.
6.5.3 Connection types for interworking in network
concatenation configurations(2)

B-IW-0.01-01-TS

Items for interworking to CSPDN, PSPDN and telex are
deleted.

B-IW-0.01-01-TS
Public Personal Handy-Phone System:
Definitions And General Principles For Public PHS Network
Interworking/Internetworking
CONTENTS
Page
1 Introduction ................................................................................................................................... 1
2 Scope ............................................................................................................................................. 1
3 Definitions ..................................................................................................................................... 2
3.1 Definitions related to services and network capabilities .......................................................

2

3.2 Definitions related to general public PHS network interworking configurations ................
4 Telecommunication services to be supported by public PHS network interworking
configurations ................................................................................................................................
5 Public PHS network interworking configurations.........................................................................

2
3
5

5.1 Reference points for network interconnections.....................................................................

5

5.2 Public PHS network to public PHS network interconnection ...............................................

7

5.3 Interworking between public PHS networks and other networks .........................................

8

5.4 Public PHS network internal interworking ...........................................................................

9

5.5 Network concatenation configurations.................................................................................. 9
6 Interworking functional requirements – General aspects .............................................................. 10
6.1 Categories of interworking functions .................................................................................... 10
6.2 Mapping principles................................................................................................................ 11
6.3 Guidelines on the description of mapping functions............................................................. 11
6.4 Functional requirements for lower layer service interworking ............................................. 11
6.5 Functional requirements for higher layer service interworking ............................................ 11
7 General aspects of selection mechanisms for interworking functions........................................... 11
Annex A Glossary and Abbreviations ............................................................................................... 13

B-IW0.01-01-TSi

B-IW0.01-01-TS
Definitions And General Principles For Public PHS Network
Interworking/Internetworking
1 Introduction
This document sets forth the general principles for interworking between public PHS networks,
between public PHS networks and other networks, and internal to a public PHS network. The need forinterworking stems from the coexistence of existing dedicated networks with public PHS networks
and from the use of different, yet compatible, bearer services or teleservices for the provision of an
end-to-end telecommunication service. When public PHS networks are introduced, it is to be expectedthat most users will need to interwork with the users of other networks, especially public switched
telephone networks (PSTNs), and public land mobile networks (PLMNs) and dedicated data networks.
Normally, each instance of communication within a public PHS network will take place between theusers of services with identical attribute values. However, communication may also take place
between users of services with non-identical attribute values. In these cases interworking functions(IWFs) will be required. In general, when an public PHS network user communicates with the user ofanother network, if the service perceived by the user of that other network were to be defined by theattribute method, the values would not be identical to those of the public PHS network user.
The purpose of interworking is to enable the users of “different” services on an public PHS network toestablish a useful communication or for an public PHS network user to establish a usefulcommunication with a user of another network and vice-versa. The term “service” in this document
implies a telecommunication service as defined in Recommendation I.210.
To permit interworking, interworking capabilities, making use of IWFs, may be required in one ormore of the following:– the public PHS network;– any other network involved;– customer equipment.
2 ScopeThis document contains the definitions and general principles to be applied in instances of ISDN
interworking, which include interworking between public PHS networks, between public PHS
network and other networks, and internal to a public PHS network.
The public PHS network interworking configurations to be considered within the scope of thisdocument include the interconnection of two networks where at least one network is a public PHS
network, the concatenation of more than two networks where a public PHS network interconnects
other networks (as a transit network), or the interconnection of two public PHS network by one ormore other networks.
Public PHS network interworking, as defined in this document, is considered to take place wheneverend-to-end communication has to be provideda) between different networks where at least one network is a public PHS network; or

B-IW0.01-01-TS1b) between telecommunication services with different lower or higher layer attributes orboth, where at least one of the interworking telecommunication service is supported by
the public PHS network; orc) between different networks and between telecommunication services with different
lower or higher layer service attributes, or both.
Public PHS network interworking, as defined in this document, is intended to cover both voice andnon-voice applications.
NOTE – Interworking at layers above layer 3 of the OSI model is not generally specified
within this and is for further study.
3 Definitions
3.1 Definitions related to services and network capabilities
The definitions which follow are related to services and to network capabilities. In those instanceswhere terms already are defined in other PHS MoU documents and ITU-T Recommendations,appropriate references are made to such documents and Recommendations.
The following definitions apply to public PHS network interworking:–Telecommunication service, as defined in Recommendation I.210.

–

Bearer service in the ISDN, as defined in Recommendation I.210 and in the I.230-Series
Recommendations.

–

Teleservice, as defined in Recommendation I.210 and in the I.240-Series
Recommendations, provides the full capacity for communication through terminal andnetwork lower and higher layer functions.

–bearer service in dedicated networks – The term bearer service in dedicated networks
is characterized by a set of lower layer attributes (e.g. data transmission services, as
defined in Recommendation X.1, for use in public data networks) and corresponds to theterm bearer service in an ISDN. Examples of bearer services in dedicated networks aredata transmission over a data network and data transmission over the telephone network.

–

Supplementary service, as defined in Recommendation I.210 and in the I.250 Series
Recommendations.

–

Bearer capability, as defined in Recommendation I.210, specifies the technical featuresof a bearer service in an ISDN as these appear to a user at the access point (S- or Treference point). The term bearer capability also may be used with respect to dedicatednetworks. A bearer capability does not include any terminal functions.

3.2 Definitions related to general public PHS network interworking configurations
This subclause provides concepts and definitions of terms relevant to the general public PHS network2

B-IW0.01-01-TS

interworking configuration. Figure 3-1/B-IW0.01 depicts the scope of application of several key
terms.
PublicPS

Public PHS network
Accesspoint

Public PHS networkor other network

Point ofnetwork interconnection‚s‚ d (Note)
Accesspoint

Resulting scope ofa bearer service ina Public PHS network interworking situation
Resulting scope ofa teleservice ina Public PHS network interworking situation•@•@

NO TE• |The TE is used to refer to either a TE1 or a TE2 plus a term inaladaptor when the network towhich it is connected is an ISDN.
Figure 3-1 / B-IW 0.01
Scope of a bearer service and a teleservice
in a Public PHS Network

In accordance with Figure 3-1/B-IW0.01, the following terms are defined:
interworking: Within the scope the I.500-Series of Recommendations, the term interworking is used
to express interactions between networks, between end systems, or between parts thereof, with the aimof providing a functional entity capable of supporting an end-to-end communication. The interactions
required to provide a functional entity rely on functions and on the means to select these functions.
interworking functions (IWFs): These functions are referred to in the Interworking definition above,
which include the conversion of physical and electrical states and the mapping of protocols. An IWF
may be implemented in the public PHS network, in the other network(s), at the user’s premises,
through a third-party service provider, or in some combination of these.
The IWFs needed as a result of a service requirement for interworking are categorized as connectiondependent IWFs or communication-dependent IWFs. The relationships among these terms anddefinitions for connection-dependent IWFs and for communication-dependent IWFs are contained in
Figure 4-1/B-IW0.01.
4 Telecommunication services to be supported by public PHS network interworking
configurations
This clause contains a list of telecommunication services that are supported by interconnections
between public PHS network and between public PHS network and other networks and defines thetypes of interworking functions required. The concept of 5 take into account:a)the definitions as outlined in 4;b) existing networks to be interconnected with public PHS network (public PHS networks,
ISDNs, PSTNs, others);

B-IW0.01-01-TS3

c)services to be offered with the public PHS network and through interworking with public
PHS network.

End-to-end communication may require:i)interworking at lower layers;ii) interworking at higher layers;iii) interworking at both lower and higher layers.

Service interworking
requirement a)

Requirement for interworking
functions b)

Connectiondependentinterworking
functions c)a)Communicationdependentinterworking
functions d)

Service interworking requirements arise from the service definitions specified in the I.200-Series
Recommendations.

b) IWFs are needed as a result of any service requirement for interworking.
c) Connection-dependent IWFs are those functions needed in order to interconnect ISDNs or ISDN andother networks.
d) Communication-dependent IWFs are those functions in addition to connection-dependent IWFs

needed in order to establish a specific end-to-end communication and which may differ fromapplication to application.

FIGURE 4-1 / B-IW0.01
Telecommunication services to be supported by ISDN
interworking configurations

Table 4-1/B-IW0.01 displays the networks that support telecommunication services which are also
supported by an public PHS network and which are candidates, therefore, for interworking with an
public PHS network in the provision of one of those telecommunication services. Furthermore, Table
4-1/B-IW0.01 depicts the type of interworking functions that may be required for each interworking
configuration. Note that the table does not indicate the possibility for interworking between different
telecommunication services.

4

B-IW0.01-01-TS

TABLE 4-1/B-IW0.01 Network support of telecommunication services
Telecommunication services
supported by the public PHS network

public PHS network interconnected withpublic PHS
network

PSTN

ISDN

Other dedicatednetworks

Telephony

0

N

N

N

Data transmission (Note 2)

(L)

N, L

N,L

N, (L)

Facsimile

0

N, L

N,L

N, L

0

No interworking functions foreseen

N

Connection-dependent interworking needed

L

Lower layer communication-dependent interworking needed

H

Higher layer communication-dependent interworking needed( ) N/L/H may be needed
NOTES
1 The list of services in Table 4-1/B-IW0.01 is not exhaustive and is therefore for further study. In particular, bearer
services must be included.
2

See Recommendation X.1 for a description of data transmission services.

3 It is assumed for Table 4-1/B-IW0.01 that, for the cases of public PHS network to public PHS network
interworking, the telecommunication services listed above are supported in both public PHS networks by the samebearer, no interworking functions are therefore required. public PHS network to public PHS network interworking
situations that involve different bearers, as an extension of Table 4-1/B-IW0.01, are for further study.

5 Public PHS network interworking configurations
This section contains the general interworking reference configurations that form the basis of all
possible public PHS network interworking configurations covered by the PHS MoU documents BIWx.xx series .
The configurations are entirely functional and do not serve any aspect of the interworking function(s)needed in any specific instance of interworking. The complexities of specific cases are considered in
the that deal at a scenario level of detail with the individual types of networks with which a public
PHS network may be interconnected, i.e. PHS MoU documents B-IW2.00, B-IW3.00 etc.
The network interworking reference point is the IF3(Kx) or IF3(Nx) reference point when the network
directly interconnected to the public PHS network is a non-ISDN or an ISDN, respectively.
5.1 Reference points for network interconnections
The protocol reference model for public PHS network interworking is outlined in 5 ofRecommendation I.320.

ITU-T

The reference points IF3(Kx) and IF3(Nx) for network interconnections are defined in this clause .
According to Note 1 to Figure 5-1/B-IW0.01 the value x = 1 signifies that interworking functions exist
in the public PHS network. The value x = 2 signifies that no interworking functions are required in the
public PHS network. No assumption is made regarding interworking functions outside the public PHS
network. Regardless of the value of x, the possibility of interworking functions in the other networks,
between the networks, or of some combination of these situations, is kept open. The case of IF3(N1)

B-IW0.01-01-TS

5

covers the situation when interworking functions are split between the two public PHS networks
involved.
5.1.1 Interworking using one-stage selection (one-stage interworking)Interworking using one-stage selection is possible when the interconnection of networks takes place
by interconnecting trunk lines. It is also possible when the networks are physically inseparable [forexample, see b) of Figure 5-4/B-IW0.01, and associated text]. In this type of interworking, each of theterminals involved in a communication has assigned to it a directory number from the numbering planof the network to which it is connected. For call establishment, one-stage selection is assumed.
For interworking by one-stage selection, the interconnection of networks takes place at reference
points IF3(Kx) or IF3(Nx) (see Figure 5-1/B-IW0.01).
The application of existing interfaces and the specification of new interfaces at the IF3(Kx) andIF3(Nx) reference points for interworking by one-stage selection needs further study.
NOTE – In Recommendation X.300 this category of interworking is defined as “interworking
by call control mapping” (see 6.2.1/X.300).
PublicPS

X-Series Recs.
S or T V-Series Recs.

IF3(Kx)or IF3(Nx)Public PHS networkg ygPublic PHS networkor other network

‚s
‚d

p

( x) .

( x)/I.510...[D03]=55.1.2 Interworking using two-stage selection (two-stage interworking)Interworking using two-stage selection is sometimes required, e.g. access to a ISDN through a public
PHS network. In this example, each of the terminals involved in a communication has assigned to it adirectory number from the numbering plan of the ISDN. For call establishment, two-stage selection isassumed: first, a connection is established through the public PHS network to the appropriate ISDN
port; second, a connection is established through the ISDN to the called terminal.
The logical appearance of interworking by two-stage selection at reference point IF3(K2) (see Note 1)
may be that of a customer access (see Figure 5-2/B-IW0.01).
The application of existing interfaces and the specification of new interfaces at the IF3(K2) reference
point for interworking by two-stage selection is for further study.
NOTES1Since, in the case of interworking using two-stage selection depicted in Figure
5-2/B-IW0.01, no IWFs are required in the public PHS network, only reference point IF3(K2) isrelevant.

6

B-IW0.01-01-TS

Public
PS

IF3(K2)other networks(e.g.internet)

Public PHS Network

PS port‚s‚d

TE portFIGURE 5- 2/ B- IW0.01
Interworking by two- stage selection at reference point IF3(K2)

5.2 Public PHS network to public PHS network interconnection
5.2.1 Reference configuration
With regard to public PHS network to public PHS network interworking in the context of the I.500Series Recommendations, the functionality required for bearer service interworking is contained inpublic PHS network to public PHS network internetwork interfaces.
Figure 5-3/B-IW0.01 shows a reference configuration for public PHS network to public PHS network
interworking. The services offered at the endpoints may be different.
public PHS network to public PHS network interworking may involve the functionality required forinterworking to take place between public PHS networks operated by, for instance, different
Administrations.
5.2.2 Connection types
Applicable PHS MoU document: B-IW2.00
ISDN circuit mode – ISDN circuit mode (both public PHS network supporting a circuitswitched bearer service)
CTx

PublicPS

Public PHS network
CEx

Public PHS network
CEy

PublicPS

CT
Connection typeCE
Connection elem ent
CEx CEy Connection elem ents
ofdifferent types•psee 4.2/I.324
FIGURE 5- 3 / B- IW0.01

Reference configuration where Public PHS Network to Public PHS Network interworking is required

5.3 Interworking between public PHS networks and other networks

B-IW0.01-01-TS7

5.3.1 Reference configurations
Network interworking is required whenever a public PHS network and other networks areinterconnected to provide an end-to-end connection.
Network interworking functions typically would contain the functionality needed for conversion ofphysical and electrical interface characteristics and for mapping of layer 2 and layer 3 network
protocols. Examples of such network interworking functions are: signalling conversions, informationtransfer, protocol conversions, analogue-to-digital (and vice versa) conversions, and interworking
between different numbering and charging plans.
Two reference configurations for network interworking are shown in Figure 5-4/B-IW0.01. The
services offered at the endpoints may be different.
The separation between a public PHS network and an other network may not always be obvious. A
local exchange may, for example, support both traditional telephony service and ISDN services. The
physical network components supporting these services may be inseparable. From a functional
perspective, such a case might be covered by a) of Figure 5-4/B-IW0.01, while b) of this Figure might
be more appropriate from an implementation point of view.
Public PHS Network
PublicPS

O ther network(s)

‚s
‚d

a)
Public PHS Network
and ISDN/PSTN‚s‚dPublicPSb)
NOTE- Case b) illustrates thesituation when no clear division exists between physicalcomponents supporting Public PHS Network and physical components supporting other network

FIGURE 5- 4 / B- IW0.01
Some examples of reference configurations where network interworking is required

5.3.2 Connection types
5.3.2.1 Public PHS network-PSTN
Applicable PHS MoU document: B-IW3.00
ISDN circuit mode-PSTN– speech;– 3.1 kHz;– 64 kbit/s unrestricted

8

B-IW0.01-01-TS

5.4 Public PHS network internal interworking
Internal public PHS network interworking involves the capabilities required for interworking between
different connection elements within a public PHS network, as well as the capabilities required tosupport other interworking requirements within a public PHS network.
A reference configuration is given in Figure 5-5/B-IW0.01. The services offered at the endpoints may
be different.
Not all aspects of internal public PHS network interworking may be subject to standardization. The
existence and functionality of such interworking, however, may have an impact on the required
functionality of network interworking or public PHS network to public PHS network interworking.
5.5 Network concatenation configurations
NOTE – The impact of network concatenation configurations (i.e. cascaded networks) on
public PHS network and existing networks and on the mechanisms and functionalities for therealization of these networks is for further study.
5.5.1 Reference configurations
See Figure 5-6/B-IW0.01
CT

Public PHS Network
CEx/CEy/CEz
PublicPS

PublicPS

CT
Connection typeCE
Connection elem ent
CEx,CEy ,CEz Connection elem ents ofdifferent types

FIGURE 5- 5 / B- IW0.01.

Reference configuration where internal/ Public PHS Network
interworking is required

B-IW0.01-01-TS

9

IF3(Kx)

Public PHS Network
PublicPS

IF3(Kx)O ther network(s)IF3(Kx)

Public PHS Network
PublicPSa)(Note)

Public PHS Network

O ther network(s)PublicPS

O ther network(s)

‚s
‚d

b)
NOTE- In the case of cascaded(concatenated) networks other than Public PHS networks,a requirement may exist for interworking functions between pairs of such networks.

FIGURE 5- 6 / B- IW0.01
Network concatenation refernce configurations

5.5.2 Connection types
5.5.2.1 Public PHS network-ISDN-public PHS network
Applicable alternatives at reference points IF3(Nx) are described in 5.3.2.1 and in PHS MoU
document B-IW2.00.
5.5.2.2 Public PHS network-PSTN-public PHS network
Applicable alternatives at reference points IF3(Kx) are described in 5.3.2.2 and in PHS MoU
document B-IW3.00 .
6 Interworking functional requirements – General aspects
6.1 Categories of interworking functions
The following network-related characteristics and protocols depend on the network type (ISDN
circuit-switched, PSTN, etc.) and may be identified at the point of network interworking forconversion or mapping:a) network characteristics related to the connection type, such as interface characteristics,
switching mode, bit rate, transfer mode, etc., and non-protocol conversion-relatedcharacteristics such as numbering plan and special routing;b) network-to-network protocols used for call establishment interexchange signalling, such
as SS No. 7, etc. (e.g. SS No. 7 ISUP to another User Part of SS No. 7, SS No.7 to nonISDN signalling system, D-channel signalling to non-ISDN user access signallingsystems based on national standards);c) protocols used for the support of those supplementary services and service signals whichhave network-to-network relevance, as in the case, for example, of the closed user groupfacility;d) signals due to network operation and maintenance;

10

B-IW0.01-01-TSe)inband protocol conversion IWFs such as rate adaption, modem pools, and generation of
inband tones and announcements.

The definition of the conversion or mapping functions is the subject of specific interworking
Recommendations which address ISDN interworking at a functional level of detail (see PHS MoU
document B-IW0.00).
Interworking functions must take into account the mapping of protocols (protocol elements) dedicatedto the support of OSI network layer service characteristics. These requirements should be formulatedwith the recognition that the networks involved in ISDN interworking may support the OSI network
layer service as defined in Recommendation X.213 in different ways and to different extents (see6/X.300).
6.2 Mapping principles
Interworking implies the transfer of information between two different entities across an interface.
This transfer may imply the need to map different protocols with respect to coding, sequencing, andtiming. Ideally, no information content should be lost in mapping. This objective may not be
achievable in all circumstances. Three different cases are identified:a) one-to-one mapping, where the information is transferred across the interface without
any loss;b) mapping with degraded information transfer, where parts of information are lost whencrossing the interface;c) no meaningful mapping possible, due to the fact that crucial parts of one protocol cannot
be represented in the other protocol.
In these cases, appropriate actions have to be taken at the interworking point with respect to one orboth of the communicating entities.
6.3 Guidelines on the description of mapping functions
For further study.
6.4 Functional requirements for lower layer service interworking(For example, mapping of layer 2 and layer 3 protocols by end systems in support of end-to-end
communication).
For further study.
6.5 Functional requirements for higher layer service interworking
For further study.
7 General aspects of selection mechanisms for interworking functions
Public PHS network interworking will involve sets of different functional elements dedicated to the

B-IW0.01-01-TS

11

various cases of network interworking. For each call where interworking is required, specificinterworking functions have to be selected (see Figure 7-1/B-IW0.01).

Public PHS Network

IF3(N1)

Network‚s‚dPublicPS

IF3(Nx)
S1

IWF
IW F
IF3(N 1)...IF3(Nx)S1...Sy

Sy
Interworking functions
Connection-dependent interworking functions
Com m unication-dependent interworking functions

FIGURE 7- 1 / B- IW0.01
Selection of interworking functions, where a Public PHS Network is interrconnectedwith another network(communication- dependent interworking functions
may or may not be required)

When the IWF is not an addressed entity, the following concept for the selection of interworking
functions is therefore defined:a)Connection-dependent interworking functions are selected by evaluation of user-networkand network-network signalling information. Relevant information includes:– bearer capability;– low layer compatibility;– service indication;– routing information (address information, transit network information);– information on supplementary services (facilities), if applicable.
b) Network-provided communication-dependent interworking functions are selected byevaluation of user-network and network-network signalling information. Relevant
information includes:– service indication;– lower and higher layer compatibility information;– information on supplementary services (facilities), if applicable.
c) End-system-provided communication-dependent interworking functions, if available, areactivated by one of the following approaches:– by evaluation of user-network signalling information during the call establishment
phase (service indication and lower/higher compatibility information);– by evaluation of user-to-user compatibility information during the parameterexchange phase.
NOTE – Examination of these information elements requires further study.

12

B-IW0.01-01-TS

Annex A GLOSSARY and ABBREVLATIONSGLOSSARY***A******B******C******D******E******F******G******H******I***
IF3(Kx)PHS MoU
The network interworking reference point is the IF3(Kx) reference point when the network directlyinterconnected to the public PHS network is a non-ISDN.
IF3(Nx)PHS MoU
The network interworking reference point is the IF3(Nx) reference point when the network directlyinterconnected to the public PHS network is a public PHS network or an ISDN.
***J******K******L******M******N******O******P******Q******R***

B-IW0.01-01-TS

13

***S******T******U******V******W******Y******Z***
Abbreviations
CE
CS
CSPDN
DTE
ISDN
IWF
OSI
PDN
PLMN
PS
PSPDN
PSTN
SS No.7
TATE

14

Connection element
Cell station
Circuit switched public data network
Data terminal equipment
Integrated services digital network
Interworking function
Open Systems Interconnection
Public data network
Public land mobile network
Personal station
Packet switched public data network
Public switched telephone network
Signalling System No. 7
Terminal adaptor
Terminal equipment

B-IW0.01-01-TS