DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-467DC-POWER (Single Carrier Cabinet Environment)
9
The DC-POWER maintenance object represents all environmental maintenance
for single-carrier cab inets, whether the external power supp ly is AC or DC. This
includes the external p ower supply and all Carrier Port Power Supplies i n a port
network composed of a single-carrier cabinet stack. The Carrier Port Power
Supplies provide + 5/-5/-48V DC to the circuit packs on the c arrier. The following
power supplies are used :
Each power unit has one yellow LED. A lit LED signifies normal operation. An un lit
LED signifies a loss of external power to the cab inet, or a fault in the power unit.
When hardware detects a prob lem with any of these components, it rep orts the
information to the system software through a single lead. System software does
not differentiate between different environmental failures. Sinc e several
environmental elements of single-carrier c abinets are logged against the
DC-POWER maintenance object, it is possible to have a DC-POWER alarm while
there is still power to the system.
If a Carrier Port Power Supply is physically removed from a carrier in a
single-carrier cab inet, there will not be a DC-POWER alarm. DC-POWER
maintenance cannot disting uish between removal of the power sup ply and the
physical absenc e of the cabinet.
There is a nominal power holdover of .25 second in an EPN single carrier
cabinet.
WP-91153 Accepts AC power input
676B Accepts DC power input