Sony SDX-800V Power Requirements, Data Compression, Voltage Max Ripple Current Typical Maximum

2.Specification

2.5.1.Power Requirements

Voltage	Max Ripple		Current
		Typical		Maximum
5V ± 5%	100 mV p-p	1.5A		2.5A
12V ± 10%	150 mV p-p	0.75A		3.0A

4.75V

0V

* exclude SCSI terminator power

5V

T

12V

0V

10.8V

-300 ms < T < 300 ms

Figure 2-5: Power-up Sequence

Note: Voltage has to increase constantly during Power-up until Maximum is reached.

Do not turn off the drive while the tape is in the drive.

2.6.Data Compression

The tape capacity is increased by compressing data prior to writing it to the tape. Data compression is a well established technology for reducing the number of bits used to represent data in order to improve data transfer rate as well as reduce the amount of storage space consumed by the data. The compression ratio depends on the source file type. The SDX-800V uses the ALDC Data Compression algorithm. ALDC is ECMA standard data compression algorithm. (ECMA-222) The Data Compression control page allows the host computer to enable data compression and decompression and also configure the way in which the drive responds to compressed/uncompressed data boundaries on the tape. The AIT-1, AIT-2, AIT-3 and AIT-3Ex Format allows both compressed and uncompressed data to reside on the same tape.

The Sony SDX-800V has a DIP switch to disable the Data Compression/Decompression. After power-on reset with this DIP switch set, both data compression and data decompression are disabled However, a MODE SELECT command can override the setting of this DIP switch. After power-on reset without this DIP switch set, both data compression and data decompression are enabled. (See clause 3.1.4)

SONY AIT-3Ex drive SDX-800V series Ver.1.1 2-11