ETSI ETS 300 458 ed.1 (1995-10)

Integrated Services Digital Network (ISDN); Specification of the Remote Frame Handler Interface (RFHI)

DE/NA-023212

Digitalno omrežje z integriranimi storitvami (ISDN) – Specifikacija vmesnika oddaljenega blokovnega strežnika (RFHI)

General Information

• Status: Published
• Publication Date: 12-Oct-1995
• Technical Committee: NA 2 - Numbering, Addressing, Routeing & Interworking
• Current Stage: 12 - Completion
• Due Date: 13-Oct-1995
• Completion Date: 13-Oct-1995
• Ref Project: SIST ETS 300 458 E1:2003 - Integrated Services Digital Network (ISDN); Specification of the Remote Frame Handler Interface (RFHI)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 458 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Specifikacija vmesnika
oddaljenega blokovnega strežnika (RFHI)
Integrated Services Digital Network (ISDN); Specification of the Remote Frame Handler
Interface (RFHI)
Ta slovenski standard je istoveten z: ETS 300 458 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 458 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 458 E1:2003
EUROPEAN ETS 300 458
TELECOMMUNICATION October 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-023212
ICS: 621.395
ISDN, interface
Key words:
Integrated Services Digital Network (ISDN);
Specification of the Remote Frame Handler Interface (RFHI)
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
New presentation - see History box

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ETS 300 458: October 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword .5
1 Scope .7
2 Normative references.8
3 Definitions, symbols and abbreviations.9
3.1 Definitions .9
3.2 Abbreviations .9
4 Reference configuration and functional model.10
4.1 RFHI applications.10
4.1.1 RFHI as network-internal interface.10
4.1.2 RFHI as inter-network interface .10
4.1.3 RFHI at T reference point.11
4.2 Reference configuration.11
4.2.1 Network configuration.11
4.2.2 Access network configuration .11
4.3 Functional model.13
5 Access methods supported by the RFHI specification.14
5.1 Services and access methods.14
5.2 Access via B-channel.14
5.2.1 Layer 1 permanent .14
5.2.2 Layer 1 on-demand .14
5.3 Access via multiple-rate channel .14
5.3.1 Permanent layer 1 .14
5.3.2 On-demand layer 1.15
6 Numbering, addressing and terminal selection.15
6.1 Numbering and addressing.15
6.2 Terminal selection and compatibility checking.15
7 Interface structure .15
7.1 General .15
7.2 RFHI channel types .15
7.2.1 D64-channel .16
7.2.2 B-channel and n x 64-channel.16
8 OA&M.17
8.1 General .17
8.1.1 OA&M scope .17
8.1.2 Principles.17
8.2 RFHI administration .17
8.3 RFHI operations and maintenance .17
8.4 RFHI accounting .17
9 RFHI signalling .18
9.1 General .18
9.2 Essential requirements .18
9.2.1 General.18
9.2.2 Outgoing call (CRF-F to RFH).18
9.2.3 Incoming call (RFH to CRF-F).19
9.2.4 Call clearing.19
9.3 Signalling reductions.19

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Annex A (informative): Requirements on common channel signalling system . 20
Annex B (informative): Bibliography . 21
History. 22

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ETS 300 458: October 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
Transposition dates
Date of adoption of this ETS: 31 October 1995
Date of latest announcement of this ETS (doa): 31 January 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1996
Date of withdrawal of any conflicting National Standard (dow): 31 July 1996

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Blank page

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1 Scope
Applicability to frame mode services
The Remote Frame Handler (RFH) is an Integrated Services Digital Network (ISDN) frame handler, as
defined in CCITT Recommendation Q.933 [4]:
- which is assumed to be remote with respect to the local connection-related function (refer to CCITT
Recommendation I.324 [3]); and
- which is accessed by its subscribers via a two-step frame mode call establishment (CCITT
Recommendation Q.933 [4], case A).
This European Telecommunication Standard (ETS) defines a manufacturer-independent interface
between the local Connection Related Function (CRF) and the RFH, supporting a specific set of services.
This interface is called the Remote Frame Handler Interface (RFHI).
The RFHI can operate:
a) as an ISDN network-internal interface, in case the RFH belongs to the ISDN;
b) as an inter-network interface, in case the RFH belongs to another network;
c) as a private-public network interface.
However, the existence of this specification does not preclude alternative implementations of a network-
internal interface for Frame Relay Bearer Service (FRBS) provided by a RFH.
Scope reduction
This ETS specifies the interface between the local CRF and the RFH. It defines those additional
requirements that are a direct result of standardizing this interface. Requirements to the ISDN and
particularly to the RFH which are inherent to the provisioning of frame relay services by the ISDN/RFH
and, therefore, are not a direct result of this interface, are specified in other standards. For such
requirements this ETS makes reference to those standards.
Combination of the RFHI with the Packet Handler access point Interface (PHI), as specified in
ETS 300 099 [8] is outside the scope of this ETS.
Supported ISDN frame mode services and conformance statement
The RFHI specification supports all case A services as defined in ETS 300 399-2 [10]; see clause 5 for
details. No other services are supported by the RFHI specification.
The RFHI may be used to offer a subset of the frame relay services supported by the RFHI specification.
Conformance to the RFHI specification is ensured by conforming to the sections of the specification that
are relevant for the support of the subset of frame relay services to be offered with the RFHI.

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2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] CCITT Recommendation E.164: "Numbering plan for the ISDN era".
[2] CCITT Recommendation E.165: "Timetable for coordinated implementation of
the full capability of the numbering plan for the ISDN era (Recommendation
E.164)".
[3] CCITT Recommendation I.324: "ISDN Network Architecture".
[4] CCITT Recommendation Q.933 (1992): "Digital Subscriber Signalling System
No 1 (DSS1) - Signalling specification for Frame Mode Bearer Service".
[5] ETS 300 011 (1992): "Integrated Services Digital Network (ISDN); Primary rate
user-network interface; Layer 1 specification and test principles".
[6] ETS 300 089 (1992): "Integrated Services Digital Network (ISDN): Calling Line
Identification Presentation (CLIP) supplementary service; Service description".
[7] ETS 300 090 (1992): "Integrated Services Digital Network (ISDN): Calling Line
Identification Restriction (CLIR) supplementary service; Service description".
[8] ETS 300 099 (1992): "Integrated Services Digital Network (ISDN); Specification
of the Packet Handler access point Interface (PHI)".
[9] ETS 300 399-1 (1995): "Frame relay services; Part 1: General description".
[10] ETS 300 399-2 (1995): "Frame relay services; Part 2: Integrated Services Digital
Network (ISDN); Frame relay bearer service; Service definition".
[11] ETS 300 402-1: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1); User-network interface data link layer;
Part 1: General aspects [ITU-T Recommendation Q.920 (1993), modified]".
[12] ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1); User-network interface data link layer;
Part 2: General application protocol specification [ITU-T Recommendation
Q.921 (1993), modified]".
[13] ETS 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1); User-network interface layer 3 specification
for basic call control; Part 1: Protocol specification [ITU-T Recommendation
Q.931 (1993), modified]".
[14] ETS 300 403-2: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1); User-network interface layer 3 specification
for basic call control; Part 2: Specification and Description Language (SDL)
diagrams".

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3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
access channel: The channel used to access the RFH. This may be a 64 kbit/s or n x 64 kbit/s multiple-
rate (see ETS 300 289) bearer channel.
access network: The set of ISDN CRFs providing the connection of the access channel between a
subscriber and the RFH.
administrative procedures: These RFHI Operations, Administration and Maintenance (OA&M)
procedures are separately activated on both sides of the interface. Synchronisation is not automated, i.e.
consistency has to be ensured externally. No signalling on the RFHI is involved.
CRF-F: CRF physically connected to the RFH.
CRF-S: CRF to which subscribers are connected. Synonym for "local CRF" as defined in CCITT
Recommendation I.324 [3].
incoming call: Call in the direction from RFH to CRF-F (CRF-S).
local RFHI access: The configuration where the ISDN subscriber accessing frame mode services is
directly connected to the CRF-F, i.e. CRF-F equal to CRF-S.
outgoing call: Call in the direction from CRF-S (CRF-F) to RFH.
remote RFHI access: The configuration where the ISDN subscriber accessing frame mode services is
connected to the CRF-F via a CRF-S, different from the CRF-F.
RFHI OA&M: The RFHI specification deals only with those RFHI related OA&M aspects, that require the
coordination of CRF-F/S and RFH. These aspects are called "RFHI OA&M". OA&M requirements that are
local to the CRF-F/S side or the RFH side of the RFHI are not within its scope.
RFHI: The interface between the access network and the RFH.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CLIP Calling Line Identification Presentation
CLIR Calling Line Identification Restriction
CRF Connection Related Function
CRF-F CRF at RFH side
CRF-S CRF at Subscriber side
DSS1 Digital Subscriber Signalling System No. one
FM Frame Multiplexer
FRBS Frame Relay Bearer Service
OA&M Operations, Administration and Maintenance
PCM 30 30 channel Pulse Code Modulation
PRA Primary Rate Access
PVC Permanent Virtual Circuit
RFH Remote Frame Handler
RFHI Remote Frame Handler Interface
SS7 Signalling System No. 7
SVC Switched Virtual Call
TE Terminal Equipment
UUS1 User-to-User Signalling, service 1

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4 Reference configuration and functional model
4.1 RFHI applications
4.1.1 RFHI as network-internal interface
If the ISDN itself provides the FRBS with CCITT Recommendation Q.933 [4] case A procedures, the RFHI
may be used as a network-internal interface, e.g. when the ISDN is implemented with different physical
equipment and in a multi-vendor environment. This RFHI application is illustrated in figure 1.
RFHI
S/T
RFH
ISDN providing
case A FRBS
Figure 1: RFHI as network-internal interface
4.1.2 RFHI as inter-network interface
Frame relay services may also be provided by networks (e.g. public data networks) other than the ISDN
the subscriber is connected to. CCITT Recommendation Q.933 [4] case A procedures may be used to
access such services of other networks. This specification may therefore be used as an inter-network
interface between the ISDN and another network providing frame relay services to the ISDN subscriber.
This RFHI application is illustrated in figure 2.
RFHI
S/T
RFH
Network providing
ISDN
  case A FRBS
Figure 2: RFHI as inter-network interface

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4.1.3 RFHI at T reference point
The RFHI may coincide with the T reference point, in either of the two previous applications. This
application is illustrated in figure 3.
T/RFHI
S
RFH
Netw ork providing
private ISDN
  case A FRBS
Figure 3: RFHI at T reference point
4.2 Reference configuration
4.2.1 Network configuration
With respect to frame relay services provided by a RFH, the network consists of two parts:
- the RFH;
- the CRFs between the subscriber and the RFH: the access network.
The RFH is a functional entity providing FRBSs remotely for a number of ISDN subscribers. FRBS in an
ISDN may be provided by more than one of such RFHs, each serving a subset of ISDN subscribers
identified by a CCITT Recommendation E.164 [1] number. A situation where complete CRF-Ss are served
by the same RFH is a special case of this.
4.2.2 Access network configuration
Within the access network, some CRFs are identified as having special relevance within the network
configuration for frame relay, with respect to a certain ISDN subscriber:
- CRF-S: CRF to which the subscriber is connected (local CRF as defined in CCITT
Recommendation I.324 [3]);
- CRF-F: CRF physically connected to the RFH serving the subscriber;
- Transit CRF: CRF between CRF-S and CRF-F, switching the subscribers access cha
...