Tascam MMP-16 Istruzioni per il montaggio

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

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

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

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

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

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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