Specifications

111Continuous Access and Data Replication Manager SAN Extensions Reference Guide
Glossary
Glossary
Glossary
This glossary defines terms used in this guide or related to this product and is not a comprehensive
glossary of computer terms.
asynchronous mode
A mode of operation of a copy set where the write operation reports completion of the
command to the host after the data is on the initiating controller, but before completion of the
remote command.
See also synchronous mode.
Asynchronous Transfer Mode (ATM)
A dedicated connection-switching technology that organizes digital data into 53-byte cell units
and transmits them over a physical medium using digital signal technology. ATM is capable of
transmitting at speeds of 155 or 622 Mbps and faster.
bandwidth
The transmission capacity of a link or system, usually measured in bits per second.
buffer-to-buffer credit
A link-level flow control mechanism. Buffers in the expansion port of switches are used to
determine how many frames can be outstanding when data is sent to a recipient.
certification
Successful completion of a comprehensive test plan.
coarse wavelength division multiplexing (CWDM)
Transmitting multiple, spaced wavelengths through the same fiber. Wavelengths are spaced 2
nanometers apart.
controller
A hardware device that uses software to facilitate communications between a host and one or
more storage devices organized in an array.
copy set
A generic term for a logical disk in one storage array that is replicated to another logical disk in
another storage array.