Three-Port Input Module Block Diagram - Symmetricom TSG-3800 Series User Manual

Input Modules
Three-Port Input Module
In addition to the input transformer, amplification is available to allow for proper
operation of the Input module when a port is connected to a monitor source. A
monitor source is a high impedance source, providing isolation of a critical DS1/E1
signal from the TSG input. With the isolation comes a loss of approximately 20 dB in
signal strength at the TSG input. For this type of input signal, amplification must be
provided to restore the signal level. This is available either through input transformer
and jumper configuration, or by a transistor amplifier circuit selected by jumper,
depending on the revision level of the module being used. For all DS1/E1 signals
that do not pass through an isolation circuit, and for all clock input signals, the
amplifier is not used.
Figure 5-9.

Three-Port Input Module Block Diagram

All versions accept square wave or sine wave input signals at a selectable rate of
1 MHz, 1.544 MHz, 2.048 MHz, 5 MHz, or 10 MHz. This allows use of a 2.048 MHz
signal conforming to ITU-T Rec. G.703/10 or other standard reference signals such
as 5 MHz or 10 MHz signals from a PRS. The input circuits provide DC blocking and
transformer isolated for either single ended, balanced, or differential inputs with the
termination selectable for 50 Ω, 75 Ω, 100 Ω, 120 Ω, or 3.3 k Ω. Clock inputs report
occurrences of loss of signal (LOS) or frequency out of range.
162 TSG-3800 User's Guide
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12778474-002-2 Revision F – March 2004