1. Tender No.: 0730-0960SV041701/05
2. Name of bidding agency: China Aviation Technology International Economic Development Co., Ltd.
3. Equipment Name: Lighting
4. Bidding method: open tendering
5. Technical requirements for bidding: See the technical specifications and requirements of the bidding documents for details.
6. Bid evaluation methods and standards: comprehensive scoring method.
7. Time and place for the issuance of bidding documents:
Release time: March 20, 2009 (excluding holidays), every day from 9:00 to 11:30, and from 13:00 to 16:30 (Beijing time).
Place of sale: 20th Floor, Block B, Yuanda Center, No. 5, Huizhong Road, Chaoyang District, Beijing, China, 100101
Price of bidding documents: 300 yuan / share. No refund after sale (mail order must be added 50 yuan each).
8. Bid security:
The bid bond is 2% of the bidder's bid price (RMB). The bid bond must be submitted to the bidding agency before the bid opening or on the bid opening date.
9. Time and address of submission of bid documents:
Bid time: March 31, 2009, 9:00~10:00 (Beijing time)
Bids documents that are received late or do not meet the requirements will not be accepted;
Bid Opening Time: March 31, 2009 at 10:00 am (Beijing time)
Bid Opening Location: China Aviation Technology International Economic Development Co., Ltd.
Bid Opening Address: 20th Floor, Block B, Yuanda Center, No. 5, Huizhong Road, Chaoyang District, Beijing.
List of required equipment materials:
Part3, lighting
Product Name Performance Index / Model Quantity Unit
Waterproof and dustproof lamp GC19-E60°C100W40ç›
Lighting pole H=6m13
Half-cut light fixture 125W13
Lamp arm 1.5 meters long and 13
Square grille ceiling lamp ~220V2×36W15ç›
Double tube fluorescent lamp ~220V2*36W53ç›
Ceiling light ~220V60W16ç›
Waterproof Ceiling Light～220V60W20ç› Company Name: China Aviation Technology International Economic Development Co., Ltd. Contact: Xie Hong, Liu Jie Tel: 010-51909638, 51909695 E-mail: Fax: 010-51909681 Postal Code: Address: Chaoyang District, Beijing 20th Floor, Block B, Yuanda Center, No. 5 Huizhong Road
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RJ45 port editing
1. Origin:
2. The name RJ stands for the registered jack and is the USOC (universal service ordering codes) code of bell system. USOC is a series of registered sockets and their wiring mode, which are developed by bell system to connect the user's equipment to the public network. FCC regulations control the application of this purpose. The FCC (Federal Communications Commission) issued a document on behalf of the U.S. government to specify RJ11.
3. RJ11 is the common name of the connector developed by Western Electric Co. Its shape is defined as a 6-pin connecting device. Originally called wexw, where x means "active", contact or needle. For example, we6w has all six contacts, numbered from 1 to 6. The we4w interface only uses four pins, the outermost two contacts (1 and 6) are not used, and we2w only uses the middle two pins. For RJ11, the information source is contradictory. It can be a 2 or 4-core 6-pin connector. What's more confusing is that RJ11 is not only used to represent the 6-pin connector, it also refers to the 4-pin version.
4. RJ45 and RJ11: different standards, different sizes
5. Due to the different sizes of the two (RJ11 is 4 or 6-pin, RJ45 is an 8-pin connection device), it is obvious that the RJ45 plug cannot be inserted into the RJ11 socket. However, it is physically feasible (RJ11 plug is smaller than RJ45 jack), which makes people think that they should or can work together. It's not. It is strongly recommended not to use RJ11 plug for RJ45 socket.
â’ because RJ11 is not internationally standardized, its size, insertion force, insertion angle, etc. are not in accordance with the international standard connector design requirements, so interoperability cannot be guaranteed. They even cause damage to both. Since the RJ11 plug is smaller than the RJ45 socket, the plastic parts on both sides of the plug will damage the metal pin of the inserted socket.
RJ - 45 port is our most common port, it is our common twisted pair Ethernet port
Because twisted pair is mainly used as transmission medium in Fast Ethernet, RJ-45 port can be divided into 10Base-T network RJ-45 port and 100base TX network RJ-45 port.
Among them, the RJ-45 port of 10Base-T network is usually identified as "eth" in the router, while the RJ-45 port of 100base TX network is usually marked as "10 / 100btx". This is mainly due to the fact that most products of Fast Ethernet router still adopt 10 / 100Mbps bandwidth adaptive.
The left figure shows the RJ-45 port of 10Base-T network, while the right figure shows the RJ-45 port of 10 / 100base-tx network. In fact, the two RJ-45 ports are exactly the same in terms of the port itself, but the corresponding network circuit structure in the ports is different, so they can not be connected casually.
Definition of RJ45 interface pin signal
Ethernet 10 / 100Base-T interface:
1 TX + tranceive data +
2 TX - tranceive data -
3 RX + receive data +
4 N / C not connected
5 N / C not connected
6 RX - receive data
7 n / C not connected
8 N / C not connected
Ethernet 100base-t4 interface:
1 TX_ D1 + tranceive data +
2 TX_ D1 - tranceive data
3 RX_ D2 + receive data +
4 BI_ D3 + bi directional data +
5 BI_ D3 bi directional data
6 RX_ D2 - receive data
7 BI_ D4 + bi directional data +
8 BI_ D4 bi directional data
Note: RJ45 interface adopts differential transmission mode, TX + and TX - are a pair of twisted pair, which can reduce interference when twisted together.
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