I NTERNATIONAL T ELECOMMUNICATION U NION
Telecommunication
Standardization Bureau
Ref:
TSB Circular 231
COM 2/ZJT
Geneva, 7 December 1999
- To the Administrations of Member States
of the Union
Tel:
+41 22 730 5887
Fax:
+41 22 730 5853
E-mail: john.tar@itu.int
Copy:
- To ITU-T Sector Members;
- To the Chairperson and Vice-Chairperson of
Study Group 2;
- To the Director of the Telecommunication
Development Bureau;
- To the Director of the Radiocommunication
Bureau

Subject: Meeting of Study Group 2 with a view to approving draft
revised and draft new Recommendations in accordance
with the provisions of Resolution 1, Section 8, of the
WTSC (Geneva, 1996)
Geneva, 13 March 2000
Dear Sir/Madam,
1
At the request of the Chairperson of Study Group 2 , (Network and service operation),
I have the honour to inform you that this Study Group, which will meet from 7 to 17 March
2000 at Geneva, intends to apply the procedure described in Resolution 1, Section 8, of the
WTSC (Geneva, 1996) for the approval of draft revised and draft new Recommendations.
2
The summaries and locations of the draft revised ITU-T Recommendations and draft
new ITU-T Recommendations proposed for approval will be found in Annex 1.
3
Any ITU Member State or Sector Member aware of a patent held by itself or others
which may fully or partly cover elements of the draft Recommendations proposed for
approval is requested to disclose such information to the TSB, in accordance with TSB patent
policy (see Resolution 1, Appendix 1 to Section 8, of the WTSC (Geneva, 1996)).
Available patent information can be accessed on-line via the ITU-T Website.
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-24
Having regard to the provisions of Resolution 1, Section 8, I should be grateful if you
would inform me by 2400 hours UTC on Thursday, 24 February whether your
Administration assigns authority to Study Group 2 that these draft revised or new
Recommendations should be considered for approval at the Study Group meeting.
Should any Member States be of the opinion that consideration for approval should not
proceed, they should advise their reasons for disapproving and indicate the possible changes
that would facilitate further consideration and approval of the draft revised or new
Recommendations.
5
If 70% or more of the replies from Member States support consideration for approval
of these draft revised or new Recommendations at the Study Group meeting, one Plenary
session will be devoted on Monday, 13 March 2000 to apply the approval procedure.
I accordingly invite your Administration to send a representative to the meeting. The
Administrations of Member States of the Union are invited to supply the name of the Head
of their delegation. If your Administration wishes to be represented at the meeting by a
recognized operating agency, a scientific or industrial organization or another entity dealing
with telecommunication matters, the Director should be duly informed, in accordance with
Article 19, No. 239, of the Convention of the International Telecommunication Union
(Geneva, 1992), as amended by the Plenipotentiary Conference (Kyoto, 1994).
6
The agenda, registration form and all relevant information concerning the Study
Group 2 meeting will be available from Collective-letter 12/2 shortly.
7
Information on the meeting rooms will be displayed on the screens at the entrances to
the ITU headquarters building.
8
After the meeting, the Director of TSB will notify, in a circular, the decision taken on
these Recommendations. This information will also be published in the ITU Operational
Bulletin.
Yours faithfully,
H. Zhao
Director of the Telecommunication
Standardization Bureau
Annex: 1
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-3-
Annex 1
(to TSB Circular 231)
Summaries and location of texts
1.
Recommendation E.106 (New) – Description of an international emergency
preference scheme
Summary
The International Emergency Preference Scheme (IEPS) is needed when there is a crisis
situation which causes abnormal telecommunication requirements for governmental, military,
civil authorities and other essential users of public telecommunications networks. It allows
authorised users to have access to the International Telephone Service while the service is
restricted due to damage, congestion and/or other faults.
Location of text: COM 2-R 61
2.
Recommendation E.169.2 (New) – Application of Recommendation E.164
Numbering Plan for universal international premium rate numbers for the international
premium rate service
Summary
This Recommendation details the application of the Recommendation E.164 Numbering Plan
for Universal International Premium Rate Numbers (UIPRN) in the provisioning of the
International Premium Rate Service as defined in Recommendation E.155.
Location of text: COM 2-R 67
3.
Recommendation E.169.3 (New) – Application of Recommendation E.164
Numbering Plan for universal international shared cost numbers for international
shared cost service
Summary
This Recommendation details the application of the Recommendation E.164 Numbering Plan
for Universal International Shared Cost Numbers (UISCN) in the provisioning of the
International Shared Cost Service (ISCS) as defined in Recommendation E.154.
Location of text: COM 2-R 67
4.
Recommendation E.191 (Revised) – B-ISDN Addressing
Summary
This Recommendation provides guidance, principles and requirements for addressing
reference points located at subscribers’ premises, servers allowing communications between
terminals, applications and persons in B-ISDN networks.
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-4This revision of E.191 was required in order to reflect the fact that B-ISDN addressing has
also incorporated the use of non-E.164 ATM End System Addresses (AESAs) to be
recognized in ATM Service Providers (ASP) networks.
This Recommendation proposes that ASPs use the ITU IND AESA as the preferred method of
B-ISDN addressing. Native E.164 and E.164 AESAs will continue to be supported. It is also
recognized that other AESA formats are assigned and in use by ASPs.
Location of text: COM 2-R 67
5.
Recommendation E.193 (New) – E.164 country code expansion
Summary
This Recommendation provides the plan that expands the E.164 country code resource (Time
“E”), and provides the transition plan as well as the timeframe required for its
implementation. Annex A provides the assumptions and assessment criteria against which
each of the E.164 Country Code expansion options was evaluated.
Location of text: COM 2-R 67
6.
Recommendation E.195 (E.nmar) (New) – ITU-T International numbering
resource administration
Summary
This Recommendation proposes the formation and functions/responsibilities of the centralized
ITU Numbering Administration Group (ITU-NAG) within the ITU-TSB. It provides
recommended procedures to ensure that all requests for resources are handled in an impartial,
uniform, consistent, and effective manner.
Location of text: COM 2-R 67
7.
Recommendation E.350 (E.dyn) (New) – Dynamic routing interworking
Summary
This Recommendation gives a framework for dynamic routing interworking in circuitswitched PSTN, narrow-band ISDN, and broadband ISDN networks. It illustrates the
functionality for setting up a call from an originating exchange in one network to a destination
exchange in another network, using one or more dynamic routing methods in conjunction
possibly with fixed routing. It describes:
a)
relevant dynamic routing functions for TDR, SDR, and EDR networks;
b)
information flows required for dynamic routing interworking between exchanges; and
c)
several examples of interworking between different dynamic routing methods.
Location of text: COM 2-R 58
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-58.
Recommendation E.351 (E.mm) (New) – Routing of multimedia connections
across TDM-, ATM-, and IP-based networks
Summary
There are many network operators who have implemented multiple networks using different
network-layer (layer-3) routing protocols, which include TDM-, ATM-, and/or IP-based
technology. Rapid growth of multimedia IP-based services has led in turn to ATM and IP
technology being implemented and/or planned for PSTNs. Established routing methods are
recommended for application across network types (summarized in Table 1 of the
Recommendation), and include the following: a) E.164/NSAP based number
translation/routing, b) automatic generation of routing tables based on network topology and
status, c) automatic update and synchronization of topology databases, d) dynamic route
selection, and e) QOS resource management. Signalling and information-exchange
requirements needed to support these routing methods are recommended, and include the
connectivity management and routing policy parameters summarized in Table 4 of the
Recommendation.
Location of text: COM 2-R 67
9.
Recommendation E.352 (New) – Routing guidelines for efficient routing methods
Summary
Routing policies typically used in ATM- and IP-based networks do not fully consider the
possible instabilities and drastic loss of throughput that can occur under congestion. Use of
bandwidth reservation and avoidance of long paths are recommended under such congestion,
which can lead to more efficient use of network resources. Also, there is an emphasis in
ATM- and IP-based networks on the use of state-dependent-routing (SDR) methods.
However, the flooding methods typically used by these SDR methods to disseminate network
status information can lead to inefficient use of network resources. Use of event-dependentrouting (EDR) methods and/or more efficient dissemination of network status information are
recommended as other possible approaches to consider. Finally, QOS routing rules are
recommended to ensure service performance quality, such as avoidance of excessive transfer
delay by limiting the number of satellite hops in an end-to-end connection.
Location of text: COM 2-R 67
10.
Recommendation F.116 (New) – Service features and operational provisions in
IMT-2000
Summary
IMT-2000 systems are third generation mobile systems, which may be terrestrial, or satellitebased and may be characterized as networks in terms of service provision. This
Recommendation describes Service Feature and Operational Provisions that apply to IMT2000 systems. It defines a set of service features and capabilities to standardize service
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-6presentation and to facilitate global mobility for users across network boundaries. Some of
these services features and capabilities are essential whilst others are optional.
Location of text: COM 2-R 58
11.
Recommendation F.852 (New) – Universal Personal Telecommunication (UPT) –
Service description (service set 2)
Summary
This Recommendation "Universal Personal Telecommunication (UPT) - Service Description
(Service Set 2)" provides the service description and operational provisions for Universal
Personal Telecommunication (UPT) - Basic UPT service scenario.
It describes the main principles of UPT, for example personal mobility, authentication and
service profile management. It defines the UPT service aspects from the user's perspective
(e.g. numbering and charging aspects). It also describes the essential features necessary to
provide the UPT service, and the optional features, which may be used to support additional
enhancements.
Location of text: COM 2-R 58
12.
Revisions to Recommendation E.411 (revised) – International network
management; Operational guidance
Summary
A new network management parameter called NER – “network effectiveness ratio” – has been
incorporated in Recommendation E.411. This parameter is designed to express the ability of
networks to deliver calls to the far-end terminal.
Location of proposed revision: COM 2-R 59
13.
Recommendation E.416 (E.41B-ISDN) (New) – Network Management Principles
and Functions for B-ISDN Traffic
Summary
This Recommendation is intended to support and define the role of network management in
the B-ISDN and broadband services. It explains the Network Management (NM) principles
and functions. The major part of this Recommendation suggests the way traffic must be
monitored and provides some indication of parameters for promptly detecting abnormal
network traffic conditions. After the detection of the abnormal condition, automatic and
possibly manual controls must be temporarily applied to the network to alleviate the problem
until the problem is resolved. It is also necessary to frequently check the effects of the NM
controls to note whether the control is actually helping with the problem and to determine
when to modify or remove it from the network.
Location of text: COM 2-R 59
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-714.
Recommendation E.438 (E.ISDN PERF) (New) – Performance parameters and
measurement methods to assess N-ISDN 64 kbit/s circuit switched bearer service UDI in
operation
Summary
This Recommendation presents an overview of performance parameters for the measurement
and assessment of N-ISDN 64 kbit/s circuit switched UDI bearer services in operation.
Guidelines and considerations for measurement methods are also provided. These parameters
can be used for N-ISDN monitoring and improvement in operations. Their achieved values
can be used both to establish guaranteed performance levels in Service Level Agreement with
the customers and Service Quality Agreement with other administrations, and to verify,
analyse and improve the performance level currently offered.
Location of text: COM 2-50
15.
Recommendation E.439 (E.ISDN TEST) (New) – Test call measurement to assess
N-ISDN 64 kbit/s circuit switched bearer service UDI in operation
Summary
This Recommendation presents an overview of the operational measurements, defined in
Recommendation E.438, that can be performed by test calls and used to assess the
performance of N-ISDN 64 kbit/s circuit switched UDI bearer services. Correspondent
measurements (excluding transmission quality measures), performed by exchanges on live
traffic, are specified in Recommendation M.3650. These Recommendations should be used by
administrations and by ROAs for monitoring and improvement analysis of ISDN services and
networks in operations. The measured values can be used both to set guaranteed performance
levels in Service Level Agreement with the customers and Service Quality Agreements with
other administrations, and to verify, analyse and improve the performance level currently
achieved.
Location of text: COM 2-51
16.
Recommendation E.460 (E.hispeed) (New) – Measurements and metrics for
monitoring the performance of V.34 Group 3 Facsimile
Summary
This Recommendation describes measurements and metrics for monitoring the performance
of V.34 group 3 facsimile. There are two options in T.30 for V.34 fax over the PSTN. These
are described in Annex C and Annex F of T.30. At present no known implementations use
Annex C; they use either Annex F or some other proprietary method. It is possible to map
many of the measurements and metrics from E.459 onto monitoring of V.34 fax.
Location of text: COM 2-R 47 (from November 1998 SG 2 meeting)
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-817.
Recommendation E.527 (Revised) – Dimensioning at a circuit group with multislot bearer services and overflow traffic
Summary
This Recommendation deals with dimensioning methods for a set of circuit groups handling
multi-slot bearer services which consists of first-choice groups and an overflow group to
which overflow traffic from the first-choice groups are offered. For this purpose, this
Recommendation provides example methods for calculating peakedness of the overflow
traffic and example methods for calculating individual call blocking probabilities of the
overflow group.
Location of text: COM 2-R 70
18.
Recommendation E.651 (E.Ipaccess) (New) – Reference connections for traffic
engineering of IP access networks
Summary
This Recommendation provides reference connections and network configurations for IP
access networks for the provision of IP telephony and TCP/IP-supported data services such as
web-browsing, e-mail, file transfer and high-speed data access. Other services such as video
telephony, video-on-demand, are for further study. Also, only point-to-point reference
connections are considered in this release of the Recommendation.
Location of text: COM 2-R 70
19.
Recommendation E.671 (E.GOSIP) (New) – Post-selection delay in PSTN/ISDNs
using Internet telephony for a portion of the connection
Summary
This Recommendation proposes a post-selection delay Grade of Service (GOS) parameter and
provisional target values when part of a PSTN/ISDN connection is replaced by Internet
Protocol (IP) based network(s). This parameter is defined and their target values provisionally
specified assuming that the network and the network components are fully operational. Also,
only point-to-point connections supporting basic call flows are considered in this release of
the Recommendation.
Location of text: COM 2-R 70
20.
Recommendation E.726 (New) –Network grade of service parameters and target
values for B-ISDN
Summary
This Recommendation provides reference connections, network Grade of Service (GOS)
parameters, and target values at both the call and the cell level for the user-plane for ATMbased B-ISDNs. The first release of E.726 applies to calls that consist of a pair of point-topoint ATM connections providing bi-directional communication between two ATM endpoints. This release also assumes switched ATM connections are established via associated
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-9signalling as defined by Recommendations Q.2931 and Q.2761, see also E.728.
Recommendation E.726 pertains to both terrestrial and satellite-based systems.
Location of text: COM 2-R 70
21.
Recommendation E.736 (Revised) – Methods for cell level traffic control in
B-ISDN
Summary
This Recommendation is concerned with the definition of control procedures which allow cell
level GOS objectives to be fulfilled. The primary objective is to define practical CAC
procedures allowing the network operator to decide when a new connection can be accepted
on individual ATM links or network VPCs. Theoretical background is included where
necessary to clarify assumptions and to situate the context of proposed control options. This
Recommendation also addresses adaptive resource management techniques, where these are
required by defined ATM transfer capabilities, and it identifies procedures for service
integration.
Location of text: COM 2-R 60
22.
Recommendation E.745 (New) – Cell level measurement requirements for the
B-ISDN
Summary
This recommendation provides the requirements to measurements needed at the cell level for
an ATM (Asynchronous Transfer Mode) - based B-ISDN (Broadband Integrated Services
Digital Network) network. Measurements may be both for real time and for record. The first
release of this recommendation focuses on the latter. This Recommendation is not restricted to
point-to-point connections, but covers point-to-multipoint connections as well.
Location of text: COM 2-R 70
23.
Recommendation E.750 (Revised) – Introduction to the E.750-series of
Recommendations on traffic engineering aspects of networks supporting personal
communications services
Summary
The E.750-Series is intended to cover traffic engineering aspects related to terminal and
personal mobility.
This Recommendation outlines the scope and the structure of the E.750-Series.
Recommendations in the E.750-Series are identified by a three-digit number.
Recommendations with the third digit in the range 0 to 4 are either of a general nature or
apply to mobile networks; Recommendations with the third digit in the range 5 to 9 normally
apply to UPT.
Location of text: COM 2-R 70
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24
Recommendation E.760 (New) – Terminal mobility traffic modelling
Summary
Terminal mobility traffic modelling for land terrestrial or satellite-based mobile systems
(including cellular, cordless, paging and IMT-2000) presented in this Recommendation is
intended to characterize the mobile user traffic demand associated with mobile services. This
demand has significance for both the user and the signalling plane.
Location of text: COM 2-R 70
_______________________
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