IBM TS3100 Setup, Operator, And Service Manual page 367

Random access memory. A storage device into which
data is entered and from which data is retrieved in a
nonsequential manner.
RAS. Reliability, availability, and serviceability.
record. A collection of related data or words, treated
as a unit.
recording density. The number of bits in a single
linear track measured per unit of length of the
recording medium.
recoverable error. An error condition that allows
continued execution of a program.
ref. Reference.
reg. Register.
reinventory. To inventory again.
retention. The process or function of tightening the
tape onto the cartridge, if it is sensed that the tape has
a loose wrap on the cartridge.
RH. Relative humidity.
robot. Picker.
robotics. Picker assembly.
RPQ. Request for price quotation.
R/W. Read/write.
S
s. Seconds of time.
SA. See Security Association (SA).
SAC. Service Action Code. Code developed to indicate
possible FRU or FRU's to replace to repair the
hardware.
scratch cartridge. A data cartridge that contains no
useful data, but can be written to with new data.
SCSI. Small computer system interface.
SE. Single-ended.
Security Association (SA). A Protocol that provides
the bundle of algorithms and data that provide the
parameters necessary to operate the AH and/or ESP
operations. See also Authentication Header (AH) and
Encapsulation Security Payload (ESP).
segment. A part.
sel. Select.
Serial Attached SCSI (SAS). A drive sled with a SAS
interface can be linked directly to controllers. SAS is a
performance improvement over traditional SCSI
because SAS enables multiple devices (up to 128) of
different sizes and types to be connected
simultaneously with thinner and longer cables; its
full-duplex signal transmission supports 3.0 GBs. In
addition, SAS drives can be hot-plugged.
serialize. To change from parallel-by-byte to
serial-by-bit.
serializer. A device that converts a space distribution
of simultaneous states representing data into a
corresponding time sequence of states.
servo, servos. An adjective for use in qualifying some
part or aspect of a servomechanism.
servomechanism. A feedback control system in which
at least one of the system signals represents mechanical
motion.
Simple Network Management Protocol. SNMP, a
standard TCP/IP protocol to send alerts about
conditions (such as need for operator intervention) over
a TCP/IP LAN network to an SNMP monitoring
station.
Slot Blocker. A slot blocker is used to restrict/close
off a data cell so a data cartridge cannot be placed
there. This blocker can easily be removed.
Small Computer Systems Interface (SCSI). A
standard used by computer manufacturers for attaching
peripheral devices (such as tape drives, hard disks,
CD-ROM players, printers, and scanners) to computers
(servers). Pronounced "scuzzy". Variations of the SCSI
interface provide for faster data transmission rates than
standard serial and parallel ports (up to 160 megabytes
per second). The variations include:
v Fast/Wide SCSI: Uses a 16-bit bus, and supports data
rates of up to 20 MBps.
v SCSI-1: Uses an 8-bit bus, and supports data rates of
4 MBps.
v SCSI-2: Same as SCSI-1, but uses a 50-pin connector
instead of a 25-pin connector, and supports multiple
devices.
v Ultra SCSI: Uses an 8- or 16-bit bus, and supports
data rates of 20 or 40 MBps.
v Ultra2 SCSI: Uses an 8- or 16-bit bus and supports
data rates of 40 or 80 MBps.
v Ultra3 SCSI: Uses a 16-bit bus and supports data
rates of 80 or 160 MBps.
v Ultra160 SCSI: Uses a 16-bit bus and supports data
rates of 80 or 160 MBps.
SNMP. Simple Network Management Protocol, a
standard TCP/IP protocol to send alerts about
conditions (such as need for operator intervention) over
a TCP/IP LAN network to an SNMP monitoring
station.
J-7
Glossary