Tascam MMP-16 Instrucciones de montaje
TASCAM
TEAC Professional Division
D00000000A
MMR-8
Modular Multitrack Recorder
MMP-16
Modular Multitrack Player
MMR-8/MMP-16
SCSI Tips for MMR/MMP Users
SCSI Tips for MMR/MMP Users rev 1.0 1/26/99
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SCSI Tips for MMR/MMP Users
Table of Contents
SCSI CABLES....................................................................................................................................... 3
Cable Quality .................................................................................................................................. 3
Cable Length and Device Support .................................................................................................... 3
Cabling Wide and Narrow Devices in a System ................................................................................ 3
SCSI TERMINATION.............................................................................................................................. 4
KINGSTON FRAME CONFIGURATION ...................................................................................................... 4
WIDE SCSI CARDS AND KINGSTON FRAMES.......................................................................................... 5
Removing the Narrow Host Adapter (Symbios SYM 8600SP) ............................................................ 5
Installing the Wide Host Adapter (Symbios SYM8751SP).................................................................. 5
Wide Kingston Drive Frames ........................................................................................................... 5
CERTIFIED DRIVES................................................................................................................................ 6
DVD RAM SUPPORT............................................................................................................................ 6
SCSI Tips for MMR/MMP Users rev 1.0 1/26/99
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SCSI Tips for MMR/MMP Users
We have found that the quality of materials and attention to detail in setting up external SCSI
devices for use with the MMR/MMP system can have a profound effect on the reliability and
performance of the system. This document provides details on some of the issues that have been
found to impact a successful and trouble-free installation.
SCSI Cables
There is a considerable difference in quality and performance of cables used to connect SCSI
devices. It is imperative that users pay close attention to this issue.
Cable Quality
High quality SCSI cables are essential for proper MMR/MMP system performance. Low quality
cables, which are often thin, may cause data transmission errors, file corruption, and system
malfunctions. This is often due to improper and insufficient grounding, incorrect pin wiring, and
unwired pins. The following SCSI cable manufacturers are highly recommended as a source for
MMR/MMP SCSI cables:
Cable Length and Device Support
The MMR/MMP SCSI host card supports from one to eight SCSI devices. However when one to
four SCSI devices are connected, total cable length should not exceed three meters. When five to
eight SCSI devices are connected, total cable length should not exceed 1.5 meters. Note that total
cable length includes the internal cabling in carriers or drive bays. Thus if a 4-bay drive enclosure
contains ribbon cable internally that measures one meter in length, the external cable must not
exceed 2 meters. Improper cable length often causes an MMR system to freeze while mounting
volumes. (Note: Paralan can provide custom-length SCSI cables).
Cabling Wide and Narrow Devices in a System
NARROW SCSI uses 8-bit data transfers. It generally uses a 50-pin connector.
WIDE SCSI uses 16-bit data transfers. It generally uses a 68-pin connector. Wide SCSI may also
refer to 32-bit SCSI data transfers but 32-bit wide SCSI is not as common.
Narrow drives should always be placed at the end of a SCSI chain. This is due to the fact that
when a Wide to Narrow connection is made, 8 bits are not passed through, so the Wide drive (and
all subsequent SCSI devices in the chain) receives only 8 bits of data instead of 16. If a Narrow
drive is connected after a Wide drive, the Wide drive still receives all 16 bits of data.
Black Box Corporation -
www.blackbox.com
1000 Park Drive Lawrence, PA 15055-1018
Tel: 724-746-5500 || Fax: 724-746-0746
email [email protected]
Paralan Corporation -
www.paralan.com
4655 Ruffner St., San Diego, CA 92111
Tel. (619) 560-7266 || Fax 619-560-8929
email: [email protected]
SCSI Tips for MMR/MMP Users rev 1.0 1/26/99
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SCSI Termination
A terminator provides electrical circuitry at the end of a SCSI chain to prevent the
reflection of electrical signals when they reach the end of the chain. The SCSI bus
requires terminations only at the ends of the SCSI chain, not in the middle. There are
several types of SCSI Termination: Passive, Active, Active Negation, Force Perfect
Termination, and Low Voltage Differential.
The MMR/MMP should only use Active terminators. This is because active
terminators involve a voltage regulator to reduce fluctuation effects in TERMPWR to
insignificance. This results in more stable SCSI signals, less signal reflection and fewer
data errors. Active negation terminators are most optimized for FAST and Ultra-SCSI
speeds. Active negation termination is currently not under testing and thus is not
supported by TASCAM.
Kingston Frame Configuration
When configuring a Kingston receiving frame the settings in Figure 1 must be used.
Note: All but one setting are factory defaults. Jumpers should be installed on W3, W1
and pins 1&2 of J6 (Figure 1). Jumper W2 determines termination. In the “A” position
(default) termination resistors are disabled (This is the recommended configuration for
most external applications). In certain conditions it may be desirable to terminate at the
frame, for example, if an internal bay is being installed in the MMR/MMP. If this is the
case jumper W2 should be set in the “B” position
Figure 1
SCSI Tips for MMR/MMP Users rev 1.0 1/26/99
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Wide SCSI Cards and Kingston Frames
The MMR/MMP are normally shipped with a narrow Symbios SCSI card. The
MMR/MMP units also support the Symbios SYM8751SP Wide SCSI card. To install a
wide SCSI card, use a grounding strap and follow the installation instructions below:
Removing the Narrow Host Adapter (Symbios SYM 8600SP)
1) Disconnect the 26-pin ribbon cable from J2 on the MMR Biphase Operations Board, and
fold out of the way.
2) Disconnect the 50-pin ribbon cable from J2 on the Symbios SYM8600SP SCSI host
adapter.
3) Remove the Phillips head screw that secures the host adapter to the chassis.
4) Carefully remove the host adapter.
Installing the Wide Host Adapter (Symbios SYM8751SP)
1) Prior to inserting the wide host adapter into the PCI slot, connect the 50-pin ribbon cable
to J4 on the SYM8751SP. This connector is located on the side of the card, which makes
it very difficult to install if the card is already in the PCI slot.
2) Insert the wide host adapter into the same PCI slot that previously contained the narrow
adapter.
3) Secure the wide host adapter to the chassis with the Phillips head screw.
4) Reconnect the 26-pin ribbon cable to J2 on the MMR Biphase Operations Board.
Wide Kingston Drive Frames
The Kingston SCSI drive frame in the MMR is normally configured for narrow SCSI. TASCAM
can also provide MMR/MMP units configured with wide Kingston frames and carriers, and can
perform a service upgrade to remove the existing narrow Kinston frame and carrier and replace it
with a wide Kingston frame and carrier. Contact your TASCAM representative for pricing and
availability on these wide units. Note that a narrow drive carrier will not fit into a wide frame, and
vice versa.
It is possible to mount a narrow SCSI drive in a wide Kingston carrier (or vice versa) by means of
an adapter inside the carrier. A good source for these adapters and other SCSI cable peripherals
can be found at:
CS Electronics
17500 Gillette Ave.
Irvine, California 92614
Tel (949) 475-9100 Fax (949) 475-9119
http://www.scsi-cables.com/Index.htm
CS Model # ADP-9051 is for HD68-pin male to 50-pin male (for mounting a wide drive in a
narrow carrier)
CS Model # ADP-9056 is for HD68-pin female to 50-pin female (for mounting a narrow drive in
a wide carrier).
SCSI Tips for MMR/MMP Users rev 1.0 1/26/99
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Certified Drives
The following disk drives have been approved for use with the MMR/MMP:
Drive Manufacturer Model Firmware Version
IBM DCHS09F 2222
Nikon* DD53-SIP Beluga AV Unknown
Seagate ST19101W 0014
Seagate ST32171N 0280
Seagate ST32272N 0876
Seagate ST34572N Unknown
Seagate ST34573N 5958
Seagate ST34573W 5764
Seagate ST39102LW 0005
Seagate ST39173N 5764
Seagate ST39173W 5764
Manufacturers frequently release new drive models and obsolete other drive models. The
most current list of approved drives can be found on the TASCAM web site at
http://www.tascam.com .
* Users should be aware these drives do not perform as well as hard drives. Test results with the NIKON
Beluga drive with 1K/sector media show 8 tracks of record and playback in 16- or 24-bit TapeMode is
generally reliable. Non-destructive mode performance is less reliable, especially with heavy edit density.
DVD RAM Support
The MMR/MMP will support SCSI backup and export to DVD RAM disks as of
software version 3.1, scheduled for release in February 1999. Testing so far indicates that
these drives are several times slower than Magneto-Optical disks for recording and
transfers. Playback of a limited number of tracks is possible from a DVD RAM disk, but
maximum performance seen to date is 6 channels of 16-bit material in TapeMode.
TASCAM
TEAC Professional Division
SCSI Tips for MMR/MMP Users 73470 Rev B
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