Quantum PX720, Руководство пользователя

Страница: 249 / 259

Glossary
Quantum PX720 User’s Guide 226
to manage storage and retrieval. The format of the additional
information is unique and is hidden from the initiator during
normal read or write operations. This additional information is
often used to identify the physical location of the blocks of data
and the address of the logical block, and to provide protection
against the loss of the user data.
The address of the first logical block is zero. The address of the
last logical block is [n-1], where [n] is the number of logical
blocks available on the medium. A Read Capacity command may
be issued to determine the value of [n-1]. If a command is issued
that requests access to a logical block not within the capacity of
the medium, the command is terminated with CHECK
CONDITION.
CHM (Cartridge Handling Mechanism)
The CHM
is a mechanical
component of the extension axis assembly
(robotics) which
grips and holds a tape cartridge in transit.
CISPR 22
This standard describes the emissions testing methods and
test limits for information technology equipment, such as
computers, office machines, or telecommunications equipment
connected to low - voltage power main networks (<600V). It does
not apply to equipment whose primary function is radio
transmission or reception as defined by the International
Telecommunications Union (ITU) Radio Regulations.
The object of the standard is to establish uniform requirements
for the conducted and radiated disturbance levels of the
equipment covered by the standard. Disturbance limits are
established for Class A and Class B equipment, and
measurement methods, operating conditions, and interpretation
of results are addressed.
Class A digital device
Class A equipment is intended for Commercial
installation.
Class I laser product
Class 1 lasers are products where the power of the
laser beam produced (the accessible emission) is always below
the Maximum Permissible Exposure value. Therefore, for Class 1
lasers the output power is below the level at which it is believed
eye damage will occur. Exposure to the beam of a Class 1 laser
will not result in eye injury. Class 1 lasers may therefore be
considered eye safe.
Class II laser product
Class 2 lasers are limited to a maximum output
power of 1 mW. A person receiving an eye exposure from a Class