Winstar Comm. (WCII) Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Winstar Comm. (WCII)

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: SteveG who wrote (4770)	3/28/1998 7:19:00 PM
From: Bernard Levy	Read Replies (1) of 12468

Hi SteveG: I have not yet examined carefully the QOS capabilities of the equipment designed by HP/STII. I know it conforms to DAVIC's specifications, so that it should probably have QOS features. Concerning your polarization question, the electric field is located in a plane perpendicular to the direction of propagation of an electromagnetic wave. It has therefore a vertical component and a horizontal component. When the field is vertical (resp. horizontal) it is said to be vertically (resp. horizontally) polarized. Each orientation can be used to carry a signal. CVUS's plan is to use one polarization for the downlink, the other one for the uplink. It also employs a checkerboard polarization scheme for its cells, so that a cell transmitter emitting a vertically polarized wave is surrounded by cell transmitters using a horizontal polarization, to eliminate intercell interferences. The concept of wavelength division multiplexing (WDM) is slighly different. It relies on the fact that a fiber optic waveguide admits several modes of propagation. Roughly speaking, they differ by how often the wave bounces off the walls of the waveguide. An analogy would be that if you have to throw a ball to someone in a tunnel, you can send the ball on a straight trajectory, or you can bounce the ball several times on the walls of the tunnel. The different modes of propagation of the waveguide at a given frequency have different wavelengths in the direction of propagation. The idea of WDM is to transmit different messages with the different propagation modes. Concerning the development of DMT or OFDM chips for wireless applications, keep in mind these would probably have to be GaAs chips. I think that TXN decided to sell its LMDS division to Bosch Telecom because it estimated that LMDS could not use DSPs in the next 5 years, whereas ADSL was ripe for DSP solutions. Best regards, Bernard Levy

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next