top iy” Heelless INSTALLATION MANUAL ABOUT THIS MANUAL This section discusses the objective, audience, and contents of this Installation Manual. OBJECTIVE ‘His manual explains how to install, maintain and troubleshoot Inter Air™ Wireless network access server equipment at subscriber sites. AUDIENCE ‘This manual is designed for the person responsible for installing and maintaining the InterAir™ Wireless network. It includes procedures that should be performed only by trained and qualified personnel.
F u FEATURES Complete direct sequence spread spectrum burst transceiver in a single COS LC. Programmable functionality supports many different operational modes Supports PN chip rate of over 11 Mchips/sec.
GENERAL DESCRIPTION The S TEL-2000A is a programmable single-chip spread spectrum transceiver. The device performs all the digital processing required to implement a fast acquisition direct sequence (i.e, pseudonymous Modulated) spread spectrum fuller half-duplex system using differential encoded BPS, SKIP, or n/4 SKIP. A bock diagram of the S TEL-2000A is shown in Figure 1, while the package style and pin configuration are shown in Figure 2.
moreover, the signal bandwidth, NCO frequency, and LF. sampling rate are all interrelated, as discussed in Appendix]. Higher LF. frequencies, however, can be supported by programming the NCO to operate on in-band aliases as generated by the sampling process. For example, a spread signal presented to the STEL2000A’s receiver Ad Cs at an LF. frequency of fiz. where friary < fir.
PRODUCT BRIEF AHA4012 1.5 MBYTES/SEC REED-SOLOMON The Advanced Hardware Architectures” AHA4012 is the lowest cost member of the AHA PerFEC™ single-chip Reed-Solomon Forward Error Correction (FEC) devices, A single-phase clock synchronizes all chip functions. COS technology and custom design techniques help achieve the density needed for a low cost solution. The AHA4012 implements a standard polynomial approved by organizations such as Intelsat.
Advanced Hardware Architectures, Ine. FUNCTIONAL DESCRIPTION A This single-chip COS device can be used to encode, decode or pass-through multiple blocks “in-line” with data flow. The device is first initialized for various programmable parameters including: erasure multiplier, error threshold, number of check bytes, number of message bytes per block, block length and a control byte.
y NET Ra TT CH TCR To TYPICAL APPLICATIONS DIAGRAM LL ENCODER COMMUNICATIONS DECODER 5 AAO ; CHANNEL 8 ARMOR DATA SOURCE EOC MICROPROCESSOR [7c rouse 7 ECC CO PROCESSOR DATA SRK x ® | BLOCK FORMAT AT: ot (A) CATAPULTS A "CALUMNY" BYTES | SYSTEM CONTROLLER (B) CATAPULTS R CHECK BYTES SYSTEM CONTROLLER FR 0) PETABYTES SYMBOL (BYTE) ERROR RATE PERFORMANCE CURVES ET The most common measures of performance for Reed-Solomon code are Pg, Pug and Carr.
Low Cost Noise Figure MEASUREMENT Using THE Y-FACTOR METHOD The design and manufacture of * high performance RF receiver systems requires careful attention to characterizing and reducing undesired broadband energy or “noise” Receiver sensitivity 15 often degraded by «the presence of this noise, and Tas a resume. the receiver may legitimates lose the ability to detest weak signals. gush receiver consign iv can be measured in rent ways, noise i lady used because be applied not only 10 \he cares system, but to
(¥1) | ENRON) = the calibrated value as 11 apps on the poise source \phonetics NF-100 Sevres Noise Figure Instrument includes ali the necessary components (or rake Y-Factor measurements in Conjuration with 3 spectrum analyzer. NF-100 Noise Figure Instrument GETTING STARTED Configure the Noise figure measurement lording to Fig 6 & Step §. Begin with the ? 8 spectrum analyzers video averaging Lo agate vacations {in signal amplitude.