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:

Paralan Corporation -

Black Box Corporation -

www.paralan.com

www.blackbox.com

4655 Ruffner St., San Diego, CA 92111

1000 Park Drive Lawrence, PA 15055-1018

Tel. (619) 560-7266 Fax 619-560-8929

Tel: 724-746-5500 Fax: 724-746-0746

email: scsi@paralan.com

email info@blackbox.com

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.

SCSI Tips for MMR/MMP Users

3

rev 1.0

1/26/99

Page 3
Image 3
Tascam MMR-8 Scsi Cables, Cable Quality, Cable Length and Device Support, Cabling Wide and Narrow Devices in a System

MMR-8, MMP-16 specifications

The Tascam MMP-16 and MMR-8 are two innovative products designed to meet the specialized needs of audio professionals, offering advanced features and capabilities suitable for various recording and playback applications.

The Tascam MMP-16 is a versatile audio router and mixer that excels in different environments, from live sound to studio recording. One of its primary features is the 16-channel configuration, allowing for significant flexibility in signal routing. The MMP-16 supports multiple audio formats, including analog signals, making it adaptable to a wide range of setups. It boasts high-quality AD/DA conversion, delivering excellent audio fidelity and low latency performance.

Additionally, the MMP-16 is equipped with comprehensive digital processing capabilities, including EQ and dynamics processing on each channel. This makes it ideal for both mixing live performances and preparing recordings for post-production. The unit's user-friendly interface includes an intuitive display and physical controls that streamline operation, making it easy for both novice and experienced engineers to navigate.

On the other hand, the Tascam MMR-8 is a robust multi-track digital audio recorder that offers exceptional reliability for professionals who require high-quality audio capture. This 8-channel recorder shines in its ability to handle various digital audio formats, ensuring compatibility with different workflows. One standout feature of the MMR-8 is its solid-state recording technology, which enhances durability and reduces the risk of data loss, a crucial aspect in high-stakes recording environments.

The MMR-8 also provides comprehensive onboard monitoring options, allowing users to assess audio quality in real time. Its extensive connectivity options include digital and analog inputs and outputs, facilitating seamless integration with other studio equipment and live sound systems. The data management capabilities of the MMR-8 make it easy to organize and retrieve recordings, while its compact design ensures portability without compromising on performance.

Both the MMP-16 and MMR-8 showcase Tascam's commitment to innovation and quality in the audio industry. Their advanced features, coupled with solid build quality and ease of use, make them essential tools for audio professionals seeking reliable solutions for their recording and mixing needs. Whether utilized separately or in conjunction, these devices amplify creativity and enhance the overall audio production experience.