PDX DCEO Qualification Card

Define the following power redundancies: N

No redundancy. Minimum toes necessary. Think having 5 toes per foot.

Define the following power redundancies: N+1

What is necessary plus one extra. 5 toes plus an extra toe.

Define the following power redundancies: N+C

What is necessary plus a catcher (zone defense).

Define the following terms: ATSC

Automatic Transfer Switch Cabinet.

Define the following terms: HOST

A server inside a rack.

Define the following terms: PDU

Power Distribution Unit.

Define the following terms: rPDU

Rack Power Distribution Unit.

Define the following terms: SLA

Service Level Agreement.

Define the following terms: TOR

Top of Rack Switch. Responsible for transmitting all data for it's associated hosts out of the rack, to the end user. Racks can have between 1 and 4 TORs.

Describe how the ATSPSU will respond with a BBU.

If primary power is lost, rack will transition to the BBU until BBU reaches low capacity. Rack will then transition to catcher.

Describe how the ATSPSU will respond to a loss of power without a BBU.

If primary power is lost, rack will transition directly to catcher. Alarm will generate due to removed battery.

Describe the major power shelf components within a Who Made Who (WMW) rack

Rectifier, ATS, and BBUs.

Describe the operation of an ATS in the following situations including any transition times or time delays: Catcher is lost

Nothing will happen. The ATS will stay on Source 1 output without redundancy

Describe the operation of an ATS in the following situations including any transition times or time delays: Primary power is lost

Non-WMW: ATS will transfer to source 2.

WMW: Battery will supply load until drained, then load will transfer to source 2.

Describe the operation of an ATS in the following situations including any transition times or time delays: Primary power is restored

ATS will transfer back to source one after the source stabilization timer elapses. 5 min.

Describe the purpose of a flip test

Confidence Test of Equipment’s ability to transfer between redundant sources without dropping the rack. Done on any rack with Gallery Based Electrical Redundancy on all redundant schemes. (ie, if C2N, Swing Load Confidence Test and ATS Flip Test)

Discuss how you would respond to a rack with elevated inlet temperatures.

Inspect temperature probe locations to determine if they have been relocated. Verify associated air handlers are operating properly. Deploy temporary cooling units where needed.

Discuss the actions required if a rack is landed without the required power topology (e.g. a 20 Kva rack in a 10 Kva spot)

Escalate to land the rack where required power topology can be provided.

Discuss the WMW rack power supply unit's rated input voltage.

480 VAC

Explain what the different indicating lights on an ATS mean including fault lights

Green lights for source availability (1 or 2), which source is aligned (1 or 2), and if the output is functional. A red light indicates faults.