1. Overview

The Personal Handy-phone System (PHS) developed in Japan will be introduced in Singapore for use in the confined area of a building. Use of PHS equipment in Singapore will require type approval by the Telecommunication Authority of Singapore (TAS), which has jurisdiction over telecommunications in that country.
TAS has decided that applications for type approval must be accompanied by a Certificate of Conformity and a test report verifying the equipment's conformity with RCR STD-28, both of which are to be issued by the Radio Equipment Inspection and Certification Institute (MKK) of Japan. These conditions are based on a Memorandum of Understanding concluded between TAS and Japan's Ministry of Posts and Telecommunications (MPT).
The following is an outline of the performance certification procedure under which MKK will issue the relevant certificate and test report.

2. PHS Certification System in Japan

Commercial PHS service was launched in Japan July 1995. MKK is responsible for verifying the technical performance of cell stations and PHS terminals used as indoor digital cordless phones as well as that of the cell stations and terminals served as the public network. This is done on the basis of Technical Standard Conformity Certification and Conformance Tests.
The principal purpose of Technical Standard Conformity Certification is to confirm that the radio equipment does not interfere with the operation of other radio stations. Table 1 lists the test items for this certification.

Table 2. Additional Items to Be Tested by the Applicant

1. Transmission characteristics Burst transmission transient response characteristics Modulation accuracy Housing radiation

2. Reception characteristics Reception sensitivity Adjacent channel selectivity Intermodulation characteristics Spurious sensitivity Housing radiation Reception-level detectivity Bit-error-rate floor characteristics

3. Antenna characteristic

The purpose of a Conformance Test is to confirm the air interface between the cell stations and terminals of the PHS system.

3. Performance Certification of PHS Equipment for Use in Singapore

Performance Certification conducted by MKK for PHS equipment to be used in Singapore will make maximum use of the data confirmed in Technical Standard Conformity Certification and Conformance Tests. When the PHS equipment in an application is the same type as equipment previously certified, MKK will verify its performance on the basis of test data collected by MKK in the past. Besides those test items, TAS has established additional test items that must also be confirmed by TAS. Table 2 lists the additional test items.
Moreover, tests must be conducted to verify the control channel, as the control channels for use by PHS equipment differ between Japan and Singapore.
Once all of these test items have been confirmed, MKK will issue a Certificate of Conformity. It will also issue a test report that combines the test data of Table 1 items MKK has collected with the test data of Table 2 items MKK endorsed for the applicant.
The Conformance Test result is designed to provide an advance technical guarantee that the PHS equipment, which is intended for indoor use in the confined area of a building, can also be operated in the future as a terminal of the public network.