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Technology Stocks : Stratex Networks, Inc. (STXN)
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To: lazarre who wrote (1107)10/11/2000 9:54:48 AM
From: Rob Preuss   of 1762
 
Technical Remarks:

STXN's Altium radio uses 128-QAM modulation (which
implies 7 bits/symbol) and transmits data at OC-3
rates (155 Mbps). Thus, the Altium is transmitting
155/7 = 22.142857 million symbols/second for a
nominal bandwidth of 22.142857 MHz. They also say
that they are actually using 28 MHz of bandwidth;
from this we find that

28/22.142857 = 1 + Alpha = 1.2645161

so

Alpha = 0.2645161.

This last value implies that their filters have a
nice tight roll-off. If they had used cheap filters,
say with Alpha = 0.4451612, their actual bandwidth
for this same symbol rate would have been 32 MHz.

Clearly, the Altium was designed for high spectral
efficiency... and STXN believes their customers
(who spent a bundle of cash for spectrum rights)
value this spectral efficiency. Based on the strong
and still-growing demand for the Altium, it would
appear that management was correct.

Rob
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