ISAPI Internet Server API
Microsoft (MICROSOFT) Internet Server (IIS) used by the programming interface, using ISAPI to perform certain functions as a stand-alone application that calls faster.
iSCSI Internet SCSI abbreviation
A method used to connect storage devices to IP (Internet Protocol) network standards, and early in 2003 by the Internet Engineering Task Force (IETF) adopted.
iSCSI via IP networks to carry SCSI commands, so you can speed up the company-internal network (intranet) for data transmission, while remote management of storage. Is generally believed that, iSCSI storage area agreement will be driven network (SAN) the rapid development of key technologies will be enhanced by storing data transmission functions and performance. As the popularity of IP networks, iSCSI can be through a local area network (LAN), wide area network (WAN), or the Internet to send data. Like with iSCSI storage using IP networks to do there is another method of data transfer ─ ─ Optical Network (Fibre Channel over IP / FCIP), also known as Fiber Channel, comparison, this method can only be with the Fiber Channel technology -linked, but they could leave the existing iSCSI Ethernet, in other words, iSCSI can be interoperable with existing computer networks, while taking advantage of existing Ethernet can build SAN. Including Cisco, IBM and other makers also made iSCSI-related products.
ISDN (Integrated Services Digital Network)
ISDN uses existing telephone lines to high-speed message across a technique, it can pass the current line digital signal to reach a higher plane than the data transfer rate, but than line (leased line) to use a lower cost.
Basically, ISDN connections are dial-up manner, which means that when users need to use the network only when the computer via ISDN to connect to the telecommunications companies. However, they can apply to both ISDN circuit-switched (circuit switched) or Packet Switch (packed switched) network, the former is B (Bearer) channels to reach, which means that you must use an exclusive channel B-type lines, the latter D (Delta) channel to achieve, so D-channel may not use the entire bandwidth of 64 Kbps.
B channel can transmit digital voice and data, while the D channel can pass control signals and data transfer rate between the two can be up to 64 Kbps. Practical application, ISDN basic rate is divided into (Basic-Rate ISDN, referred to as BRI) and Primary Rate (Primary-Rate ISDN, PRI) are two former provides two B Channels and one D Channel; the latter system in the United States 23 B Channels and one D Channel, the European system provides 30 B Channels and one D Channel.
Usually we will be more than one T1 (1.544 Mbps) or E1 (2.048 Mbps) rate ISDN Broadband ISDN also classified as 『』 (Broadband ISDN, B-ISDN), usually it is the framework in ATM, or optical fiber network; and the aforementioned BRI (2B + D) or PRI (23B + D, 30B + D) compared to narrowband ISDN 『』 (Narrowband ISDN, N-ISDN), or referred to as ISDN.
In the country, ISDN lines to BRI-based, so we use the ISDN can reach 128 Kbps (2 B channels) of pure data transmission rate, or the simultaneous transmission of voice and data (each occupy 64 Kbps of the B channel, which means one hand, phone side of the transmission of information), before the use of ISDN, in addition to the telecommunications company to apply for an ISDN dial-up account, he also must use a special ISDN modem.
ISDN may be the future of architecture in optical fiber networks (fiber optical network), to improve the current telecommunications line quality and transmission efficiency. ISDN is currently the most likely lies in the use of video-conferencing system (video conference), through the ISDN network will be set for users around the screen on the computer, in addition to any multi-media system in the wide area network (WAN) on the application, can the use of ISDN . |
