6500-4

Communications modem

Properties of 6500-4

Supplementary Features:

Modulation and demodulation of carrier at 75 bps data rate with binary fsk with 2.5 khz deviation performs various sync, preamble, and end of text recognition functions. Contains psfudorandum function generator for control of associated radio set frequency, receives messages that synchronize modem to satellite timed access modes. Demodulation of 8 ary fsk carrier with tones spaced 200 hz apart. Automatic synchronization to carrier frequency obtained by operating on real time vector asspecified by pluggable read only memory module. Deinterleaving, decovering, error decoding and block error detection of received messages

NSN:

5895-01-062-0002

Description:

Modem,communications

Cage Code:

11627

Definition Communications Modem

An item which modulates and demodulates one or more electrical signals. It connects data terminal equipment to a communication line or network such as telephone, radio or telegraph. It may include the multiplexing and demultiplexing circuits, circuit amplifiers and source(s) of carrier frequency. For items designed for light signals, see modem, fiber optic.

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