Tascam MX-2424 User manual
TASCAM
TEAC Professional Division
MX-2424
24-Bit 24-Track Hard Disk Recorder
MX-2424 Version 2.1
SCSI Instructions
SCSI Terminology ................................................................................................................................................. 3
SCSI.....................................................................................................................................................................................3
Throughput...........................................................................................................................................................................3
8-Bit Data Transfer ..............................................................................................................................................................3
16-Bit Data Transfer ............................................................................................................................................................3
Ultra SCSI (Narrow) ............................................................................................................................................................3
Ultra Wide SCSI ..................................................................................................................................................................3
LVD (Wide Ultra2 SCSI) ....................................................................................................................................................3
SCSI Terminator ..................................................................................................................................................................3
SCSI ID................................................................................................................................................................................3
SCSI Cables/Terminators...................................................................................................................................... 4
Additional Recommended Sources for SCSI Cables, Terminators and Adapters: ...............................................................4
CS Electronics .................................................................................................................................................................4
Paralan Corporation .......................................................................................................................................................5
StorCase Technology.......................................................................................................................................................5
Removable “Hot-Swappable” SCSI Solutions...................................................................................................... 6
Rhino Jr. System ..................................................................................................................................................................6
Ultra 160 Data Express System............................................................................................................................................6
Ultra 2 Data Express System................................................................................................................................................6
Wide Data Express System ..................................................................................................................................................6
Compatibility Considerations...............................................................................................................................................6
Mounting/Un-Mounting Drive in Removable Carriers ........................................................................................................7
External Drive Cases ............................................................................................................................................ 7
Data Silo DS-100 .................................................................................................................................................................7
Additional recommended sources for external drive enclosures:.........................................................................................7
Glyph Technology............................................................................................................................................................7
Note on High Density and Very High Density 68-Pin External Connectors........................................................................7
SCSI Connection Matrix ....................................................................................................................................... 8
SCSI Rules............................................................................................................................................................. 9
Examples of Correct SCSI Configurations............................................................................................................ 9
SCSI Cable Length.............................................................................................................................................. 14
Number of SCSI Devices..................................................................................................................................... 14
Proper Termination............................................................................................................................................. 15
3
SCSI Terminology
It is important to understand some SCSI basics before adding drives to an MX-2424. The first step in this
understanding is familiarity with a few simple terms.
SCSI
Stands for Small Computer System Interface. This is the data transfer method and physical connection
used by the MX-2424 for connection to hard drives and backup solutions.
Throughput
This is the amount of data transferred from one device/component to another in a specified time period.
8-Bit Data Transfer
This refers to data transfer between a SCSI device and the MX-2424’s processors and supports
throughput of up to 20Mbytes/second. This should not be confused with the term “24-bit audio” which
refers to the resolution of recorded audio.
16-Bit Data Transfer
This refers to data transfer between a SCSI device and the MX-2424’s processors and supports
throughput of up to 80Mbytes/second. This should not be confused with the term “24-bit audio” which
refers to the resolution of recorded audio.
Ultra SCSI (Narrow)
This type of SCSI device uses 8-bit data transfers and generally employs a 50-pin connector. An example
of such a device would be the DVD-GF2050 DVD-RAM drive, offered by TASCAM as a backup
solution for the MX-2424.
Ultra Wide SCSI
This type of SCSI device uses 16-bit data transfers and generally employs a 68-pin connector.
LVD (Wide Ultra2 SCSI)
Stands for Low Voltage Differential (also known as Ultra2 SCSI). This is the particular type of SCSI
protocol used by the MX-2424. LVD SCSI uses 16-bit data transfers and employs a High Density or
Very High Density 68-pin connector. This allows throughput of 80 Mbytes/second.
Low Voltage Differential (LVD) works by sending simultaneous pairs of data in a balanced
configuration. Just like a balanced audio signal, the noise is rejected when the signals are summed.
Because of noise rejection, the bus can operate at higher speeds and longer cable lengths. The MX
provides Ultra2/LVD performance on the internal and external bus.
SCSI Terminator
This is a special device that must be attached to the last device in a SCSI chain for the system to function.
SCSI ID
This is a number that is set on each SCSI device in a SCSI chain, which identifies that device to the MX-
2424.
4
SCSI Cables/Terminators
There is a considerable difference in quality and performance of cables used to connect SCSI devices.
Low quality cables may cause data transmission errors, file corruption and system malfunctions. It is
important to always use high quality SCSI cables & terminators such as those available from TASCAM
listed below for use with TASCAM distributed external drive enclosures.
SCSI-MX2: 3’ 68-pin High Density to 68-pin Very High Density SCSI cable for connecting the MX-
2424 to an External Drive Case.
SCSI-MX3: 1.5’ 68-pin Very High Density SCSI cable for connecting External Drive Cases to each
other.
SCSI-MXT: 68-pin Very High Density LVD/SE terminator for use with an External Drive Case.
Additional Recommended Sources for SCSI Cables, Terminators and Adapters:
CS Electronics
www.scsi-cables.com
17500 Gillette Ave.
Irvine, California 92614
(949)-475-9100
Supported Internal Adapters:
•68-pin to 50-Pin Internal Adapter for attaching a narrow back up device (DVD-RAM or Travan Tape)
to the internal bay on the MX-2424.
P/N: ADP-9053
Supported External SCSI Cables:
•High Density 68-Pin to 68-Pin SCSI cable with Thumbscrews, 3 ft.
P/N: HD68T-HD68T/3ft-132U
•High Density 68-Pin to 68-Pin SCSI cable with Clip Locks, 3 ft.
P/N: HD68C-HD68C/3ft-132U
•High Density 68-Pin to Centronix 50-Pin SCSI cable with High 9 Active Termination, 3 ft.
P/N: T68A-C50/3ft
•High Density 68-Pin to High Density 50-Pin SCSI cable with High 9 Active Termination, 3 ft.
P/N: T68A-HD50/3ft
Supported Terminators:
•Centronix Active Negation Terminator
P/N: TRM-8511
•HD50 Active Negation Terminator:
P/N: TRM-8527
•68-Pin High Density LVD/SE Terminator
P/N: TRM-8900L
•68-Pin Very High Density LVD Terminator
P/N: TRM-8920
5
Paralan Corporation
www.paralan.com
4655 Ruffner St.
San Diego, CA 92111
(858)-560-7266
Supported SCSI Cables:
•68-Pin to 68-Pin High density SCSI cable for LVD and Wide use, 3 ft.
P/N: SQ-9-9-3
StorCase Technology
www.storcase.com
17600 Newhope St.
Fountain Valley, CA 92708
(800) 435-0642
Supported SCSI Cables
•68-pin Wide Very High Density to 68-Pin High Density Cable
P/N: DC-SCSI3/U2-3
•68-pin Wide Very High Density to 68-Pin Very High Density Cable
P/N: DC-U2-3
Supported Terminators:
•50-pin Centronix Active Terminator
P/N: DX100-S-TA
•50-pin High Density MM Active Terminator
P/N: DX100-S2-TA
•68-pin Wide Very High Density LVD/SE Terminator
P/N: DX-U2-LVD/SE
6
Removable “Hot-Swappable” SCSI Solutions
The following “hot-swappable” StorCase SCSI Carrier/Frame Systems are approved for use with the MX-2424
when configured according to the diagrams on the following pages:
Rhino Jr. System
Frame & Carrier: RJR100-SW/B (Wide)
RJR100-SWU2X/B (Ultra 2)
Carrier Only: RJR100-CSW/B (Wide)
RJR100-CSWU2X/B (Ultra 2)
Ultra 160 Data Express System
Frame & Carrier: DE100i-SW160/B (New Part #: S20A100 includes Isolator Board)
Carrier Only: DE100i-CSW160/B
Frame Only: DE100i-RSW160/B (New Part #: S20A101 includes Isolator Board)
Ultra 2 Data Express System
Carrier Only: DE100i-CSWU2X/B
Frame Only: DE100i-RSWU2X/B
Isolator Board: DX1/200-X2/RH
Wide Data Express System
Carrier Only: DE100i-CSW/B
For information on the Storcase Isolator board for the Ultra 2 and Ultra 160 Data Express frames please contact
Storcase at (800) 435-0642
Compatibility Considerations
Systems that use single-ended wide receiving frames will not function reliably with Ultra 2 and Ultra 160 carriers,
thus the DE100i-CSW/B carrier should be chosen when the widest possible compatibility is required. The U160
Frame/Repeater board combination will accept SE Wide, Ultra 2 or Ultra 160 carriers.
Ultra 160 Data Express models that include the isolator board on the frame (S20A100 frame & carrier, black, or
S20A101 frame, black), should be used for maximum compatibility & reliability. Please refer to the Compatibility
Chart below:
S.E. LVD
DE100i-CSW/B DE100i-RSW/B Yes N/A
DE100i-CSW/B DE100i-RSWU2X/ B Yes N/ A
DE100i-CSW/B DE100i-RSW160/B Yes N/A
DE100i-CSWU2X/B DE100i-RSW/B Yes N/A
DE100i-CSWU2X/B DE100i-RSWU2X/ B Yes Yes
DE100i-CSWU2X/B DE100i-RSW160/B Yes Yes
DE100i-CSW160/B DE100i-RSW/ B No No
DE100i-CSW160/B DE100i-RSWU2X/ B No No
DE100i-CSW160/B DE100i-RSW160/B Yes Yes
Carrier Model Frame Model
Com
p
atible
Combo
7
Mounting/Un-Mounting Drive in Removable Carriers
When drives are installed in StorCase carrrier/frames, the MX-2424 can mount and un-mount removable drives
without required a system reboot. Remember to un-mount (SHIFT+MOUNT) before removing any StorCase
carriers from the MX-2424 to avoid data corruption and system errors. To re-mount the drive carrier, lock it and
press the MOUNT key. Note that Rhino Jr. and Data Express systems are not cross compatible.
External Drive Cases
The following StorCase external drive cases are approved for use with the MX-2424:
Data Silo DS-100
Single Bay: DS100-1-160/B
Dual Bay: DS100-2-160/B
Additional recommended sources for external drive enclosures:
Glyph Technology
www.glyphtech.com
Note on High Density and Very High Density 68-Pin External Connectors
There are two types of 68-Pin SCSI cables and terminators available for use with LVD devices: High Density (HD)
and Very High Density 68-Pin (VHDCI). The MX-2424 has a standard HD connector located on the back of the
unit. However, by using a HD to VHDCI SCSI cable, it may attach to external devices with VHDCI connectors.
Before configuring your system, verify the type of 68-Pin devices you wish to connect to.
8
SCSI Connection Matrix
MX-2424 Approved SCSI Configurations
Internal Drive External Drive
Int HD Front
DVD
Front
Tape
Front HD
Rhino Jr
Front HD
Data
Express
Ultra 2
Front HD
Data
Express
160
Ext DVD Ext
Tape
Ext HD
Rhino Jr
Ext HD
Data
Express
Ultra 2
Ext HD
Data
Express
160
Ext
Orb
Notes
1
11
11
1 1
11
11 2
11 2*
11 2*
11 1
11
11 2
11 2 *
11 2*
11 1
11
11 1
11 1
11 1
11
111
111
11 2
*
11 1
11
111 *
111
*
11 2
*
1 3
1 3 *
4#
4* #
13
*
* Each Storcase device in this configuration MUST use an Isolator Board
# Each external SCSI cable may not exceed 1.5 ft. each in length.
Numeral indicates the maximum number of a specific device that can be connected in that position.
9
SCSI Rules
There are a few rules that must be considered when connecting SCSI devices to the MX-2424:
1. Narrow (8-bit) devices connected externally to the MX-2424 must be connected at the end of the
SCSI chain.
2. Narrow (8-bit) devices may be installed in the front panel bay of the MX-2424 with the proper
adapter (ADP-9053).
3. Only Approved SCSI devices should be connected to the MX-2424 in approved configurations. For a
list of currently approved SCSI devices check the TASCAM web site at http://www.tascam.com.
This list will be updated as needed.
4. A SCSI chain must always be properly terminated.
5. Each device in a SCSI chain must have its own unique SCSI ID number.
Examples of Correct SCSI Configurations
KEY:
HD Approved Hard Drive
ORB Orb Drive w/ Built-In Active Termination
IT LVD/SE Internal Terminator (Included with the MX-2424)
MB MX-2424 Motherboard
EC External SCSI Connector (On MX-2424)
BU Single Ended Backup Solution (DVD-RAM or Travan)
IA 68 Pin to 50 Pin Internal Adapter (ADP-9053)
LET LVD/SE External Terminator
AET Active External Terminator
MX-2424 with standard internal hard drive.
10
MX-2424 with standard internal hard drive and single ended backup device (DVD-RAM or Travan) in
the front bay.
MX-2424 with standard internal hard drive and single ended backup device (DVD-RAM or Travan) in
external 68-pin case.
MX-2424 with standard internal hard drive and single ended backup device (DVD-RAM or Travan) in
external 50-pin case.
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9
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