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S25FL128SDPMFIG10_Datasheet PDF

发帖时间:2021-06-15 02:03:48

Organized as 32 Kbits-x-36, 16 Kbits-x-36, 64 Kbits-x-18, or 32 Kbit-x-18, the devices offer 133-MHz synchronous operation for up to 9.6-Gbit/s throughput. Separate clocks on each port allow buses to run at different frequencies, while 9-bit byte-enabled support allows each port to interface with buses of different widths.

Estimates of maximum ADSL loop length vary. ITEX officials quoted a practical figure of 16,000 feet from the central office, while 18,000 feet is the theoretical maximum so far, Hulett said. We've seen loop lengths up to 22,000 feet, but in the service, they're not going to go that far to the edge. They want to promise something they can deliver,” he said of service providers.

ITEX claims SAM can operate in households 20,000 feet from the central office. ITEX was able to extend distances through optimization of filtering chips, as well as echo-canceling schemes,” Gillings said. In July, Lucent Microelectronics announced a similar 20,000-foot capability for its WildWire ADSL modem technology.

S25FL128SDPMFIG10_Datasheet PDF

The extra distance can add to ADSL's target markets substantially, according to a study by DSL vendor Orckit Communications Ltd., which is headquartered in Tel Aviv, Israel. [Orckit] said at 12,000 feet only 50 percent of the people can be covered [by ADSL]. By extending out to 18,000 feet, 80 percent of the people can be covered,” said Will Strauss, president of research firm Forward Concepts (Tempe, Ariz.).

Competitors say they haven't found a way to extend the reach of ADSL without hitting some compromise. Usually that means that the carrier-end box, known as a DSLAM, has to have a chip set compatible with that in the ADSL modem.

We have looked at alternatives to be able to improve reach and make our products immune to potential crosstalk, but my understanding is, it's always a compromise,” said Sassan Babaie, vice president of marketing with Pulsecom Communications Inc. (Herndon, Va.).

S25FL128SDPMFIG10_Datasheet PDF

ITEX claims its SAM chip is compatible with any DSLAM chip set that operates on the G.Lite or G.dsm standard.

ITEX also claims the SAM chip set increases the speed of G.Lite, hitting download speeds of 3.5 Mbits/s and matching the G.dtm upload speed of 640 kbits/s.

S25FL128SDPMFIG10_Datasheet PDF

ADSL deployment has been slow, Strauss said, despite the high numbers reported by some vendors. High volumes of chip sets have been shipped, for example, but many have gone into PCs whose owners probably aren't even aware they've bought DSL capability, he said.

All told, central offices will be equipped to handle 1 million ADSL lines this year, well up from 75,000 last year, Strauss said.

Along with insufficient supplies, memory price increases are making it difficult for aspiring manufacturers of MP3 players. Samsung Electronics Co. Ltd., which supplies flash memories only to domestic manufacturers, plans to raise prices soon. It plans to provide 50,000 units of 16-Mbit flash memories to just a handful of player makers, including Saehan Information Systems, LG Electronics, Telian AV Systems and Samsung's own MP3 operation.

As a result, most Korean companies that do not get their supplies from Samsung face failure unless they can obtain flash memory products elsewhere.

But even companies that obtain supplies from Samsung face challenges. LG Electronics has developed several MP3 players, including one unveiled in June with an FM radio function and 32-Mbits of storage. A 64-Mbit product was scheduled to be introduced in December., but LG was later forced to cancel that strategy when flash memory supplies dried up.

Meanwhile, flash shortfalls have forced Sachan and Samsung to delay the introduction of a second MP3 player model developed earlier this year. Baromtech, which had negotiated a supply contract with Seoul Mobile Telecom, was also forced to delay plans for a July launch here of a supermini MP3 player. The company will instead focus on the export market.

Technology startups developing MP3 players and products are also being forced to delay production plans as a result of the flash memory and memory card shortage, industry sources said.

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