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 cabinets, whether the external power supply is AC or DC. This
includes the external power supply and all Carrier Port Power Supplies in 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 carrier. The following
power supplies are used:
Each power unit has one yellow LED. A lit LED signifies normal operation. An unlit
LED signifies a loss of external power to the cabinet, or a fault in the power unit.
When hardware detects a problem with any of these components, it reports the
information to the system software through a single lead. System software does
not differentiate between different environmental failures. Since several
environmental elements of single-carrier cabinets 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 cabinet, there will not be a DC-POWER alarm. DC-POWER
maintenance cannot distinguish between removal of the power supply and the
physical absence 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
