EXAR Introduces New Single-Chip Multiplexer for High-Speed WAN Applications; Device is Ideal for Multi-Service Internet Platforms.Business Editors FREMONT, Calif.--(BUSINESS WIRE)--Dec. 20, 1999 EXAR Corporation (Nasdaq:EXAR) announced today the availability of a new single-chip multiplexer/demultiplexer for Wide Area Network (WAN) systems. Optimized for the higher speed demands of multi-service Internet-based data applications, the XRT XRT A symbol used specifically upon the consolidated tape to indicate a security trading ex-rights. Notes: Typically, a stock will depreciate in price immediately after rights offering expires. 72L13 provides three data transmission capabilities: channelized Refers to an architecture that transmits data in channels. It often refers to the 64 Kbps channels in T1 lines, which were originally developed to handle digitized voice streams (TDM). See TDM. , clear channel and clear channel HDLC (High-level Data Link Control) A data link protocol from ISO for point-to-point communications over serial links. Derived from IBM's SDLC protocol, HDLC has been the basis for numerous protocols including X.25, ISDN, T1, SS7, GSM, CDPD, PPP and others. . The device is targeted at multi-service multiplex/demultiplexers, frame relay A high-speed packet switching protocol used in wide area networks (WANs). Providing a granular service of up to DS3 speed (45 Mbps), it has become popular for LAN to LAN connections across remote distances, and services are offered by most major carriers. systems, digital access/cross connect systems, as well as digital switches and test equipment. At the edge of the network, at the intersection where slower data transmissions (T1/E1) meet high-speed (DS3) data delivery found in a typical central office switch environment, the XRT7213 can multiplex a total of 28 T1 (1.544 Mbps) channels, or, if required, 21 E1 channels into DS3 data traffic (44.736 Mbps). In the opposite direction, the device can reverse the process and demultiplex one DS3 into 28 T1, or 21 E1 channels. "The XRT72L13 is a cost-effective, integrated single-chip multiplexer/de-multiplexer that performs the critical data processing data processing or information processing, operations (e.g., handling, merging, sorting, and computing) performed upon data in accordance with strictly defined procedures, such as recording and summarizing the financial transactions of a needed for a seamless connection to the Internet," said, Raman Subramanian, director of strategic marketing, Communications division. "The XRT72L13 device is extremely flexible permitting the user to deploy this device into frame-relay over DS3 and clear-channel applications." Technical Description The XRT72L13 is a fully integrated, low power, multiplexer/framer IC which performs multiplexing/demultiplexing of 28 T1, or 21 E1 signals into/from a DS3 signal with either M13 or C-bit parity frame format. The XRT72L13 device also consists of 28 digital phase locked-loops which are used to smooth the data and clocks of each of the 28 DS1 (or 21 E1) signals. This feature permits the user to directly interface the receiver of the XRT72L13 to a DS1 or E1 Line Interface Unit (LIU LIU Linköpings Universitet (Sweden) LIU Long Island University (New York) LIU Line Interface Unit LIU Lightguide Interconnection Unit (AT&T) LIU Laugh It Up ) for transmission to remote terminal equipment. In the clear channel framer mode, the XRT72L13 transmitter will accept payload data from terminal equipment and insert it into a DS3 frame. This capability supports data link functions for high-speed data communications data communications, application of telecommunications technology to the problem of transmitting data, especially to, from, or between computers. In popular usage, it is said that data communications make it possible for one computer to "talk" with another. . The receiver will extract the payload data from the DS3 frame and deliver it to the terminal equipment in either a serial or nibble-parallel manner. Additionally, the framer block will increment performance monitor registers in response to erred events such as line code violations, framing bit Same as start bit and stop bit. errors, P-Bit Errors, and CP-Bit Errors. In the high-speed HDLC controller mode, the XRT72L13 payload data is processed by an HDLC controller before being applied to the DS3 framer. The transfer of the payload data between the device and the terminal equipment is in a byte-wide manner. Price and Availability The XRT72L13 is available in 208-pin PQFP (Plastic Quad Flat Package) Refers to many varieties of QFP chip packages, which are molded in plastic. See QFP. packages in industrial temperature ranges for $155.52 each, in 1,000 piece units. Limited production samples for key customers will be available within 60 days. About Exar Exar Corporation designs, develops and markets innovative, system-oriented mixed-signal integrated circuits for high-speed broadband communications and data acquisition markets. The company, based in Fremont, had fiscal 1999 revenues of $71.9 million and employs approximately 275 people worldwide. |
|
||||||||||||||
Printer friendly
Cite/link
Email
Feedback
Reader Opinion