HP Integrity NonStop H-Series - Manual (Page 11)

Chapter One – Introduction
Tandem 5142-xSE Rackmount Tape Subsystems User Guide 1
1.1 Product Description
The 5142-xSE was designed and built specifically for Tandem Computers by TapeLabs for use
in a telco central office environment. It's applications include file backup, archiving and software
loading. The 5142-1SE contains one DAT drive. The 5142-2SE contains two independent DAT
drives. The models are identified as:
Tandem Model Number Tandem Part Number Number of DAT drives
5142-1SE 139086 One
5142-2SE 130985 Two
Table 3 Tandem model and part number
Note: While it is housed in the same enclosure as the 5142-2SE, the 5142-1SE contains only
one DAT drive, one TapeLabs' intelligent LCD, one set of Infourmm SCSI bridge electronics
and one set of rear connectors. The vacant bay in the enclosure is concealed with a bezel-
matching filler panel in the front and sheet metal in the back.
In the interest of brevity and to avoid redundancy, this manual uses the term 5142-xSE
when discussing content that is common to both the 5142-1SE and 5142-2SE.
Additionally, the illustrations contained within this manual focus on the 5142-2SE;
however, when the need arises, the 5142-1SE is handled on an individual basis.
The 5142-xSE unit mounts in a 19-inch opening. It consists of a 4mm DAT drive, a printed
circuit board (The printed circuit board acts as a fast SCSI bridge between the host and tape
drive. It is used for collecting data and displaying transaction information on the subsystem's
LCD), a AC/DC converter, and a cooling fan. It has built-in Power On Self Test (POST)
diagnostics.
The 5142-xSE is DDS-3, using the 125 meter DDS-3 tape cartridge. The drive is also backward
compatible with the DDS-2 and DDS-1 tape formats. The unit is considered a Field Replaceable
Unit (FRU), and can be installed or replaced by a Tandem customer service representative.
Each DAT drive module has a front panel LCD that shows performance and statistical
information to the user. Additionally, the LCD panel, allows some configuration and diagnostic
utilities to be run to verify correct drive set-up and functionality. Internal drive and PWA
firmware can be upgraded without the necessity of opening the drive case via a code-load tape.
The DAT drive can store 12GB of data per DDS-3 cartridge, and up to 24GB of data in compressed
mode (assuming a 2:1 compression factor). The drive has both read and write heads and can
perform read-after-write (RAW) data checking on the fly.