ADC PWR-AVIS 2.2 Functional Description, Note:

ADCP-61-814 ∙ Issue 1 ∙ April 1999

Note: If using the single power supply option, the module should only be inserted into the PWR 1 slot.

Figure 4. Power Supply Module

2.2 Functional Description

PWR-AVIS provides a central jack access point between network elements (NE). See Figure 5 on the next page. The jack access cards provide access to circuits for monitoring and maintenance functions. (The jack circuitry automatically provides 75-ohm termination.) The jacks also provide patching functions to bypass defective equipment and/or isolate problems in circuit links. The monitor jack is non-switching. Patching into this jack does not break the circuit and allows non-intrusive access. The unity gain (baseband video) card provides a 0 dB level at the monitor jack. The IN and OUT jacks incorporate a “make before break” switching design and self-terminate into 75-ohms to ensure high service performance without interruption. The IN switching jack provides access to the input signal of an NE. Patching into the jack opens the circuit and signals can be inserted for testing or patching to bypass defective equipment. The OUT switching jack provides access to the output signal of an NE. Patching into the jacks opens the circuit and signals can then be extended for testing or bypass functions. When patching arrangements do not extend the NE output signal, it is recommended that an external 75-ohm termination plug be inserted into the OUT switching jack. This provides greater signal isolation and reduces cross-talk level. The amplifier cards, which do not have jacks for circuit access, provide fixed gain amplification of an incoming signal by 0, 10 or 20 dB respectively for return path applications.

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