iDCS 500 Release 2 / OfficeServ
INSTALLATION
TECHNICAL MANUAL
PART 4 MARCH 2004
4.1
PART 4. POWER UP PROCEDURES
4.1 DETERMINING POWER SUPPLY
Each cabinet on the iDCS 500 has two power supply slots the first of which must
contain a PSU B and can supply up to 56 station devices or Station Equivalent Power
Units (SEPU). The second PSU slot can contain either a PSUB or a PSU 60 and can
supply up to 64 station devices or SEPUs. Several interface cards, other than station
cards, consume 48V power and the consumption of these cards is rated in SEPUs. If it
has been decided that a second power supply is required, then the plastic Power
Safety Cover must be removed before the second power supply is installed.
The SEPU rating of all cards that consume 48V is shown in the table below:
Card Type
SEPU
Rating
Notes
WLI
32
Each Channel counts as a port
16 DLI
16
8 DLI
16
Each B channel counts as a port
16 SLI
16
16 MWSLI
16
SVMi-8/SVMi-16E
8
SVMi-16E with 12 ports = 10 SEPU
SVMi-16E with 16 ports = 12 SEPU
8 SLI
8
8 MWSLI
8
4 BRI
8
Each B channel counts as a port
MGI 2
8
SLI 4
E&M 4
DID 4
GTRK 4
The system enables cards from the card installed in the nearest card slot to the PSU
(Power Supply Unit). After the system enables each card, the system compares the
remaining power capacity of PSU1 and PSU2 to decide which PSU has the larger
remaining power capacity. Then the system allocates the PSU to the card which has
larger remaining power capacity. This means that the cards will be powered up on
alternate power supplies. If a PSU does not have sufficient power capacity to fully
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