International Procurement Office, Nippon Telegraph and Telephone Corporation, Marukinbancho Bldg. 6F, 6-28 Rokubancho Chiyoda-ku, Tokyo 102 Japan

58 -- DIGITAL MICROWAVE COMMUNICATION SYSTEM FOR SHORT-DISTANCE TRANSMISSION SOL IPO.08-404 DUE 071596. POC NTT America, Inc., Head Office, 101 Park Avenue, 41st Floor, New York, NY 10178, 212/661-0810 also NTT America, Inc., Pacific and Western Division 700 E.El Camino Real, Suite #200, Mountain View, CA 94040, 415/940-6565. This public notice is to request suppliers to provide NTT with general referential information on similar products or technology prior to procurement of the intended products (mentioned below) by NTT. This public notice is also to request that any suppliers wishing to participate as a subcontractor in the procurement program of this product should declare their intentions to that effect. This public notice is not intended to guarantee public notification of procurement of the product. (1) Name: Digital microwave communication system for short-distance transmission. (2) Overview: Digital microwave communication system for short-distance transmission consists of a terminal station equipment a radio-relay station equipment and a remote supervisory equipment. The terminal station equipment consists of an optical/electrical signal converter, a data handling unit to handle SOH data and so on, a modulator/demodulator and a transmitter/receiver. The radio-relay station equipment demodulates a radio frequency signal transmitted from a terminal station equipment, equalizes the signal wave form, and transmits a radio frequency signal after modulation. The remote supervisory equipment remotely monitors channels and equipments. Two types of systems should be available to implement local transmission lines with different transmission capacity: - Large capacity type to offer 16 x156 Mbit/s for main transmission lines. Small capacity type to offer 2 x 156 Mbit/s for branch transmission lines. The radio-relay station equipment of the small capacity type is installed on a steel tower while that of the large capacity type has four different optical interfaces, 6Mbit/s, 32 Mbit/s, 52 Mbit/s and 156 Mbit/s while the large capacity type has two different optical interfaces, 52 Mbit/s and 156 Mbit/s. Technical requirements are as follows: 1) System requirements: -Frequency band for communications: 4/5/6/11 GHz bands. -Communications service: Transmission of 156 Mbit/s digital signal. 2) Terminal station equipment requirements -Installation: Installed in a central office. -Optical signal interfac: 156 Mbit/s, 52 Mbit/s, 32Mbit/s (only for the small capacity type), 6 Mbit/s (only for the small capacity type). -Functions: Optical/electrical signal conversion, data handling (SOH handling, clock frequency conversion), error correction, digital modulation/demodulation (the signal points are more than or equal to 16), waveform equalization, space diversity (optional) and crosspole interference cancellation (optional) 3) Radio-relay station equipment requirements -Installation: Installed on a steel tower (the small capacity type) or in a central office (the large capacity type). Functions: Error correction, digital modulation/demodulation, waveform equalization, space diversity (optional) and crosspole interference cancellation (optional). 4) Remote supervisory equipment requirements. -Installation: Installed in a central office except a remote supervisory equipment installed on a steel tower for a small capacity type radio-relay station equipment. -Functions: To remotely supervise the status of a station, an equipment and channels (no control function) (3) Contents of RFI: NTT is inviting the following types of information on a product or technology similar to the above-mentioned system. This is not, however, a request for suppliers to provide proprietary and/or confidential information, (A) Technical information 1) Electrical characteristics System diagram, transmitting power, receiving power range, receiver noise figure, transmitting/receiving frequency, occupied bandwidth, equivalent noise bandwidth, filter configuration, frequency stability, digital modulation system, bit error rate to C/N performance, phase noise, equalizer system, error correction system, space diversity system, crosspole interference canceller system, data handling system, remote supervision system, evaluation method of bit error performance, remote supervision item, optical signal interface, external equipment interface and power consumption 2) Mechanical characteristics: Outward appearance during operation and transportation, size of weight. 3) Accessories 4) Electrical/physical conditions Environmental conditions (temperature, humidity, power outlet, etc.) and conformity to VCCI (*) standard. (*) VCCI is Voluntary Control Council for Interference by Data Processing Equipment and Electronic Office Machines. (Abbreviated VCCI). 5) Others: Technologies implemented in design specifications to reduce the effect of fading and interference (b) Price and its terms and conditions 1) Unit price and its terms and conditions for a terminal station equipment 2) Unit price and its terms and conditions for a radio-relay station equipment 3) Unit price and its terms and conditions for a remote supervisory equipment (C) Standard delivery period after an order is placed (D) Sales results (E) Others 1) Troubleshooting support organization. Maintenance support organization. 2) Other constructive proposal that an contribute to NTT's business (4) Request for Declaration of the Intention of Participating as a Subcontractor Any suppliers wishing to participate as a subcontractor in the product procurement program of NTT, are requested to supply NTT with the information listed below. After preparing a list of supplied information, NTT will provide the list to suppliers who wish to be provided with it, to those who have responded to the request for supply of the information listed and to those who have purchased the PROCUREMENT DOCUMENTATION relating to procurement of the product. NTT, however, will undertake no responsibilities for any outcomes arising from supply of the list, (i) Name of supplier, (ii) Place of contact (Address, name of the person in charge, telephone number, and facsimile number). (5) Deadline of submission of materials and comments: 3:00 PM, July 15, 1996 (Mail must arrive no later than the above date). (6) Language: Japanese or English. (170)

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