Transmitter/Receiver

TM 11-6625-3056-12

Transmitter/

The TS-3981 consists of two functional sections, a transmitter and a receiver. The transmitter

Receiver

generates a test pattern that is applied to the input of the path under test. The receiver accepts

the test pattern from the path and detects and counts any errors that may have occurred. The

receiver can also be set to measure the time it takes for the path to acquire synchronization.

The transmitter and receiver are both contained on a single circuit card assembly. A smaller

circuit card assembly, mounted on the transmit/receive assembly, contains the master oscillator.

A power supply is contained in a separate assembly and provides regulated +5-volt power.

Rate Select

The RATE SELECT switch selects the output rate of the Clock Generator and therefore selects

the rate at which both the transmitter and receiver will operate.

PR GenData output from the transmitter is produced by a PR (pseudo-random) Generator. This type of generator

produces a signal that is random enough to approximate real data (real data is totally random; that

is, it is never known whether the next bit will be a logic 1 or a logic 0) yet repeats itself in such a

manner that a test circuit can determine whether the received bit is supposed to be logic 1 or a

logic 0.

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