Technical data

www.asti-usa.com ASTi DACS: Operation & Maintenance Manual (Version 4, Rev. B.1)

Spares Recommendations

To ensure the absolute minimum down time in the event of a failure, a “hot” spare unit is recom-

mended. This spares the DACS at the system level and eliminates any need for technicians to

enter the system to replace individual components.

Hot spare units consist of the same components contained in the system(s) they are sparing. Soft-

ware is not included, thereby reducing the cost of the platform signiﬁcantly. Often, the Hot spare

unit contains all of the components a user would normally spare individually.

The user may preconﬁgure the spare unit with the correct Model Builder software version and any

sound model and ﬁles for their application.

Where the “Hot” spare approach is cost prohibitive, one of each type of replaceable component in

the DACS should be spared. To ensure compatibility with the rest of the system, all spares should

be purchased from ASTi. Malfunctioning may result if the wrong type of hardware is installed.

Other reasons for buying spares at the time of initial purchase include:

• reducing cost and delivery time of repairs (unit availability can be as much as 90 days)

• costs for spare unit installation versus standard repair costs are often much less

In general individual spare components required will consist of the following:

• One Model Processor - this consists of the PC chassis, power supply, all disk drives (hard

and ﬂoppy), CPU board, and backplane.

• One Host Interface Card

• One or more Waveform Synthesizer Cards

Systems which contain a removable drive module will want to spare the following:

• One Removable Hard Drive Cartridge with Hard Drive

Systems which contain TDM cards will want to spare the following:

• One or more TDM cards

• One or more RIUs.

MicroDACS systems will want to spare one or more of the following:

• CompactFlash™ or Microdrive™ removable media modules

Care should also be taken in sparing RIUs. Because different versions exist, the user should

ensure that the full part number is veriﬁed and then speciﬁed when ordering.

If you are unsure of your spare requirements, please contact ASTi at (703)471-2104.