Question 19/I - International public data transmission service - service
definitions, Quality of Service and provision of customer
support (revised and expanded, previously Question 2/I, 1985-1988)

Considering that

(a) administrations are providing public data transmission services;

(b) Recommendations F.600 and F.601 describe service and
operational principles for public data transmission services;

(c) Recommendations in the X-Series define the technical aspects of
public data networks,

study is required in the following areas:

1. updating of Recommendations F.600 and F.601 in the light of
operational experience;

2. drafting of new Recommendations to cover service aspects of data
transmission when using:

- circuit switched networks

- switched telephone network

- switched telex network

- ISDN

- leased circuits

- interworking between the various networks;

3. these Recommendations shall cover the user requirements for:

a) harmonization and security of user log-on procedures, including
X.3, X.28, X.32;

b) harmonization of call progress signals:

-mapping of international progress signals between similar networks

-mapping of international progress signals between other networks, e.g
PSPDN and telex;

c) Quality of Service, end-user performance for

-different traffic types, e.g. interactive/bulk data transfer

-networks used

-interworking between networks;

d) customer support aspects

- customer service/"help desk"

- customer information

e) directory services for data

- provision

- user access/facilities

- Recommendation F.500;

f) general aspects

- management of networks/services

- operational procedures;

4. further standardization of international user classes of service and
optional user facilities;

5. definition of connectionless services in public data networks;

6. liaison with other Study Groups, in particular:

Study Groups III, VII, VIII, IX and XVIII.