Digital tape Emulation SYstem II 27 марта 2015, 12:44
The DESY II system is a 19” rack mount system designed for laboratory environments. The DESY II is also available in a “Rugged” configuration for harsher environments. The rugged platform is not intended for extreme environments, but environments where vibration is present.
The DESY II is a high speed digital recorder and playback unit. It is controlled remotely using a subset of DCRsi commands from a host processor via RS-232 serial input, or it can function in standalone mode with monitor, keyboard and mouse. In standalone mode the DESY II is controlled with serial commands or a simple graphical user interface (GUI) control.
● The DESY II lab unit and DESY II rugged unit are high speed PC/RAID-based digital recorders.
● The DESY II system can record and playback data at any data rate from 0 to 30 megabytes/sec.
● The DESY II system is controlled using DCRsi commands and, when appropriate, responds in a like manner.
● The DESY II is also controlled using a simple graphical user interface.
● The DESY II is a PC based system with a RAID system for data storage. In a RAID 5 configuration, the DESY II removable RAID drives provide sequential storage with data striping at the byte level and stripe error correction information. This results in excellent performance and fault tolerance.
The data interface is an 8-bit wide parallel interface with 8 parallel data lines, a common clock and one enable signal. Input and Output signals are ECL differential.
Variable Data Rate
The DESY II supports variable data rate recording from 0 MB/s to 30 MB/s. The DESY II adjusts to the input clock and records and plays at the input clock data rates continuously, or with fluctuating input, or in burst up to 37.5 MB/s. The DESY II's instantaneous recording and playback provides data capture without time delays associated with transport mechanisms.
An RS-232 or RS-422 serial interface controls the DESY II from a remote host. This interface controls the operation of the system, built-in-test, status and diagnostic reporting.
The DESY II has a limited "Rotary Transverse Emulation Mode (RTEM)" of operation. This mode of operation is to support users and applications previously supported by digital tape recorders with rotary transverse tape transports. NOTE: Because the DESY II does not record to a tape, limited head life and head replacement are no longer issues.
Tape Cartridge Emulation
The DESY II does not use physical tape cartridges. It is a disk based digital data recorder which replaces the "tape cartridge" by segmenting the RAID drives into four partitions of approximately 50 gigabytes each. Each partition represents a tape cartridge of 50GBs or greater and is called a "Tape".