ADCP-61-814 ∙ Issue 1 ∙ April 1999
Note: PWR-AVIS units configured with the single powering option can be upgraded to redundant power by ordering an additional power supply module (PWR-AVIS-PSC).
The PWR-AVIS provides two sets of screw terminal contacts (see Figure 8) at the rear of the chassis for connecting to a -48V office power supply. Alternately, a 110-48V (PWR-AVIS- 110-ST) converter (purchased separately) can be attached to either set of contacts.
2.2.2AlarmsAs shown in Figure 8, PWR-AVIS incorporates two pair of screw terminal alarm contacts (PS1-A and B, and PS2-A and B) located at the rear of the chassis. The contacts may be used as an interface to any existing customer-supplied alarm system. Both A and B contacts perform the same function and can be used with two independent types of warning signals, either audible or visual. If the power supply voltage drops below a normal operating threshold of 3.5VDC, failure is detected and alarm(s) are triggered. The alarm contacts are normally open and will close when a failure occurs.
2.2.3Single/Dual Powering and AlarmsWhen PWR-AVIS is configured with a single power supply, only the PS1 alarms should be used. If the power supply fails in this configuration continuity will occur between the PS1 alarm terminals and all RIUs will lose power.
When PWR-AVIS is configured with two power supplies, it normally operates using the primary power supply. If the primary power supply fails, its alarms will activate and the secondary power supply will seamlessly begin to provide power to the chassis. When the primary power supply begins to operate properly (after replacement or maintenance), its alarm will deactivate and it will seamlessly override the secondary power supply. In all cases (except where both power supplies fail) all RIUs will continue to be supplied with power.
CLASS 2
SPARE 
SPARE 
–48V (1) 
RET (1) 
–48V (2) 
RET (2) 
PS1 ALM A
PS1 ALM B
PS2 ALM A
PS2 ALM B
TEST
AVIS
12247-B
Figure 8. Power and Alarm Contacts
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© 1999, ADC Telecommunications, Inc.