Mitsubishi Electronics DX-TL2500U operation manual Glossary

Glossary

■Glossary

• I/O terminals

Terms used for referring to both input and output.

• RS-232C

Connection standard used for handling data between de- vices such as a PC, modem, etc. A standard when con- necting a PC and modem. The upper limit for the commu- nication speed of this standard is 115.2kbps and the maxi- mum transfer distance is 15m. Since this standard only defines the roles and physical characteristics of the con- nector pins, there are various types of connectors such as 25-pin, D-sub, etc.

• Copy

Term used when copying part of data to an external stor- age media. The term “copy” in this manual refers strictly to the process of taking out only the data before and after failures from continuous video to a SCSI device, Compact Flash Card or video for analytical purposes.

• Hard disk drive (HDD)

Storage device using the same magnetic recording proc- ess as tapes and is used in PCs. An aluminium disk coated with magnetic materials is used on the surface as the stor- age medium and since there is no contact during record- ing/playback, there is no head wear. Data search is also quick since recording is performed in numbered sections called sectors.

• Media

Term was originally referred to media that transmits infor- mation. Media mostly refers to hard disks, DVD RAM, MO disks, magnetic tapes, and are commonly referred to as storage media. Media types are largely categorized by the recording method, such as optical disks, magnetic optical disks, magnetic disks, etc.

• Capacity

Term to indicate the amount of data that can be stored in a storage device such as memory, disk, etc., and unit is indi- cated in B (bytes).

• Compact Flash Card (CFC)

One of the standards for a compact memory card. The Compact Flash Card has such merits as strong durability and ease of handling.

• Restore

Term referred to when copying data that has been backed- up in a peripheral recording device, etc., to the built-in hard disk of the unit.

• Partition

A partition is one of the many divided areas on the Hard Disk.

• RS-485/RS-422

The serial interface stipulated by EIA taking the place of RS-232C. It is very suitable for the longer and higher-speed communication since RS-422/RS-485 adopts the balanced type signal transmission in comparison with RS-232C that adopts the unbalanced type signal transmission.

• Mirroring

One way of protecting data on magnetic disks. This func- tion writes data alternately to 2 Hard disk drives with the same capacity. However, there is the demerit of using 2 drives in place of 1, resulting in half the available space.

■Relation of recording operation to the number of cameras and recording interval settings

The recording pattern of this unit is as illustrated in the diagram below. Video data input from all the connected cameras is recorded sequentially. (Max. 60P recording interval during normal recording.)

The example when setting

a setup of each channel to “1PPS”

1 second

C1-3

60P

12:00:03~

1 second

C4-1

C3-1

C2-1

C1-1

C4-2

C3-2

C2-2

C1-2

60P

60P

12:00:01~

12:00:02~ Examples of time displayed

during playback.

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