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This Optimization tool provides some options to you for improve network performance.

Internet access introduction:

·         Modem. Users who connect to the Internet through a modem should select this option.

·         ISDN, i.e. Integrated Services Digital Network. Peak rate of N-ISDN (N: Narrow) can reach 64-128Kbps. According to our testing, the best rate of N-ISDN is only twice as fast as that of a 56K modem connection.

·         xDSL, i.e. Digital Subscriber Line. DSL includes symmetric IDSL, HDSL, SDSL and asymmetric ADSL, VDSL， etc. At present, there aren't many enterprises adopting DSL. PPPoE is the most common Internet access used by ADSL users. We advise DSL users to select this option.

·         PPPoE, Point-to-Point Protocol over Ethernet. At present this is the most common Internet access adopted by ADSL users, which can enable fast ADSL identity confirmation to create virtual digit dialing connection for users through PPPoE technology and an ADSL Modem. We advise PPPoE ADSL users to select this option.

·         Cable Modem, i.e. data sharing connection through CATV network. Users of Cable TV network Internet access should select this option.

·         LAN or broadband. This option is provided to LAN users who want to improve broadband performance. The most common bottleneck of a broadband connection for LAN users does not lie in the user’s system but on the outlet of the broadband supplier, which is caused by our district broad band design. (Description of district broadband design: 1. District broadband supplier rents broad band from telecoms or other companies; 2. broadband supplier lays fast channels such as fiber optic between rented server and districts; 3. Users connect to district server through LAN. As stated above, the way for district users to connect Internet is: user PC->district node->server rented by supplier->Internet. So the first bottleneck of district user Internet access speed lies in the size of the rented server; second it lies in the number of users. The essential reasons which causes low speed is out of the contradiction of insufficient server and increasing number of users.)

·         Other connections. We suggest users of new Internet access (e.g. wireless connection to the Internet) select this option.

MTU (Maximum Transmission Unit): This option defines the maximum of sending a datagram (packet) in every frame.

Maximum data Segment Size (MSS): This option defines the actual segment size in the packet (datagram discussed in MTU). Because packet includes information such as IP address, MSS shouldn't exceed MTU in size. Standard IP header is 40, so both transferable MTU and MSS are 40.

Transmission unit cache: This option defined the size of maximum TCP receiving window of the system. The size of the window implies the transferable bytes when it hasn't received response (Remark: Refer to TCP/IP agreement for details about receiving window). If transmission unit cache is set too small, transmission efficiency will be lowered because it may result in packet block. If transmission unit is set too big, transmission efficiency will also be lowered because the error in one packet can lead other packets to be given up or resent.

Default package TTL (Time to Live): This option has defined the default TTL for the header of the output IP message. IP packet will be discarded if it fails to reach its destination within the TTL. Windows default setting of TTL is 128.

1. Optimize COM port buffer: This option is to set the cache size for the COM port which modem connects to. When this option is selected, Windows will auto-check the port connecting to modem and define the proper cache size according to your memory size. Meanwhile, the optimization tool will set the baud rate of the port as 115200.

2. Maximum threads connected by IE: Optimize maximum thread number of IE simultaneous connection. For server HTTP 1.0, Windows restricts the maximum of simultaneous connections to 4; For server HTTP 1.1, Windows restricts the maximum of simultaneous connections to 2. The selection of this option will add IE simultaneous connections by way of adding server connections.