HP StorageWorks Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide (AA-RPHZF-TE, March 2004)

Glossary
242 Data Replication Manager HSG80 ACS Version 8.7P Configuration Guide
FD SCSI
The fast, narrow, differential SCSI bus with an 8-bit data transfer rate of 10 MB/s.
See FWD SCSI and SCSI. More information is available from http://www.t10.org
.
fiber
An optical strand used in fiber optic cable. Spelled fibre when used in “Fibre Channel” protocol.
See also fiber optic cable, Fibre Channel.
fiber optic cable
A transmission medium designed to transmit digital signals in the form of pulses of light. Fiber optic cable is
noted for its properties of electrical isolation and resistance to electrostatic contamination. Available in three
sizes: 50-micron multimode, 9-micron single-mode, and, in older installations, 62.5-micron multimode (not
recommended for new installations).
Fibre Channel
An ANSI standard name given to a low-level protocol for a type of serial transmission. The Fibre Channel
specifications define the physical link, the low level protocol, and all other pertinent characteristics.
FL_port
A port in a fabric where N_port or an NL_port may be connected.
See N_port, NL_port, F_Port.
See also fabric.
firewall
A generic term used to describe a limited DRM configuration consisting of only two switches. The maximum
distance between any two components is 500 meters due to the short range GBICs.
See also DataSafe.
frame
A frame is the basic unit of communication using the Fibre Channel protocol. Each frame consists of a payload
encapsulated in control information. The initiator breaks up the exchange into one or more sequences, which in
turn are broken into one or more frames. The responder recombines the frames into sequences and exchanges.
See also initiator.
FWD SCSI
Acronym for fast, wide, differential (FWD) Small Computer System Interface (SCSI) bus with a 16-bit data
transfer rate of up to 20 MB/sec.
See also FD SCSI and SCSI.
GBIC
An acronym for gigabit interface converter. The hardware devices inserted into the ports of the Fibre Channel
switch that hold the Fibre Channel cables. A GBIC converts fiber optic cable connections to Fibre Channel
switch connections.
GBICs are available in three types: shortwave, longwave, and very long distance. Shortwave is limited to
50-micron multimode cable and 500 meters. Longwave uses 9-micron single-mode cable and is limited to a
maximum distance of 10 kilometers. Very long distance also uses 9-micron low-loss cable and may extend to
100 kilometers.
GLM
Gigabit Link Module, used in short-wave multimode fiber only. GLMs, as a function of GBIC, are used in Fibre
Channel long-distance applications. As applied to the Data Replication Manager, the GLMs provide the ability
to increase the fiber optic cable transmission distances from 10 km to 70 km.
hard address
The AL_PA or ALPA which an NL_port attempts to acquire during loop initialization. Not used by DRM.