3A FM Terminal Transmitter and Receiver

  • Barry J.
  • Gammie J.
  • Lentz N.
  • Salvage R.

As indicated in a companion paper, FM terminals perform the initial and final modulation steps in the T D - 3 microwave radio system. 1 The FM transmitter converts the baseband signal to a frequency modulated signal centered at 70 M H z ; the FM receiver performs the reverse function of recovering the baseband modulation from the FM signal. Although primarily intended for use in the T D - 3 system, the 3A FM terminal equipment* also is used for improved performance in the TD-2 system. 2 Design emphasis was placed on: (i) reliability and minimum maintenance through the use of solid-state circuitry throughout, (ii) im* M a n u f a c t u r e d by the Western Electric C o m p a n y for Bell System use only. 1423 1424 T H E BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1!)G8 proved performance consistent with the more stringent T D - 3 objectives, and (in) reduced cost and size. The types of baseband signals to be transmitted over the terminals are discussed by S. D. Hathaway and others. 1 In general terms they consist of 1200 message circuits comprising two multiplex mastergroups or a single NTSC* color television signal. FM terminals are required at each end of a radio route and at intermediate points where the baseband signal or some portion of it must be added or dropped. The 3A design is based on a maximum of 16 terminal pairs in tandem in 4000 miles.

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

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  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
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Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

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  • Chen R.
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  • Le D.
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How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...