What is SCSI (Fast Wide)?

SCSI (Fast Wide) is a SCSI-2 interface mode combining 10 MHz Fast timing with a 16-bit data bus, offering a theoretical maximum throughput of 20 megabytes per second on a 16-bit single-ended implementation.

What does STM-4 (signal) represent?

STM-4 (signal) is a Synchronous Transport Module level-4 in SDH networks, providing a nominal line rate of 622.08 Mbit/s used for multiplexing digital traffic in telecom backbone links.

Why is the conversion approximate?

Because SCSI (Fast Wide) measures parallel device bus throughput while STM-4 reflects multiplexed optical signal rates including overhead, the conversion is contextual and not a direct one-to-one equivalence.

How to Convert from SCSI (Fast Wide) to STM-4 (signal)?

Learn how to convert data transfer values from SCSI (Fast Wide), a legacy parallel bus interface, to STM-4 (signal), a standardized optical transmission rate used in telecom networks.

SCSI (Fast Wide)

STM-4 (signal)

Please check your input. It must be a valid numeric value.

SCSI (Fast Wide) to STM-4 (signal) Conversion Table

SCSI (Fast Wide)	STM-4 (signal)

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

SCSI (Fast Wide) to STM-4 (signal) Conversion Table
SCSI (Fast Wide)	STM-4 (signal)

Explore More Data Transfer Units Converter

What Is This Tool?

This converter helps translate data transfer rates from SCSI (Fast Wide), a legacy parallel data bus interface, to STM-4 (signal), a high-speed optical transport rate in the Synchronous Digital Hierarchy (SDH). It enables users to compare and integrate transfer speeds across distinct technologies.

How to Use This Tool?

Enter the amount in SCSI (Fast Wide) you want to convert
Select 'SCSI (Fast Wide)' as your original unit and 'STM-4 (signal)' as your target unit
Click convert to view the equivalent value in STM-4 (signal)

Key Features

Converts data transfer values between SCSI (Fast Wide) and STM-4 (signal) units
Supports integration of legacy storage interfaces with modern telecom rates
Browser-based, easy-to-use interface requiring no installation
Provides examples for quick understanding of conversion outputs

Examples

10 SCSI (Fast Wide) equals approximately 2.572 STM-4 (signal)
5 SCSI (Fast Wide) equals approximately 1.286 STM-4 (signal)

Common Use Cases

Comparing legacy disk subsystem transfer rates with optic network capacities
Planning telecommunications backbones integrating storage device speeds
Bridging data center storage transfers and telecom SDH transport rates

Tips & Best Practices

Understand that this conversion is approximate due to differing transmission types
Consider implementation factors like cable length and device negotiation affecting SCSI throughput
Account for STM-4 overhead which reduces usable payload bandwidth compared to nominal rates

Limitations

Actual SCSI (Fast Wide) throughput varies with hardware implementation details
STM-4 includes overhead for management and synchronization, not purely payload data
Conversion represents approximate equivalence between fundamentally different data transfer types

Frequently Asked Questions

What is SCSI (Fast Wide)?: SCSI (Fast Wide) is a SCSI-2 interface mode combining 10 MHz Fast timing with a 16-bit data bus, offering a theoretical maximum throughput of 20 megabytes per second on a 16-bit single-ended implementation.
What does STM-4 (signal) represent?: STM-4 (signal) is a Synchronous Transport Module level-4 in SDH networks, providing a nominal line rate of 622.08 Mbit/s used for multiplexing digital traffic in telecom backbone links.
Why is the conversion approximate?: Because SCSI (Fast Wide) measures parallel device bus throughput while STM-4 reflects multiplexed optical signal rates including overhead, the conversion is contextual and not a direct one-to-one equivalence.

Key Terminology

SCSI (Fast Wide): A SCSI-2 interface mode combining Fast timing and a 16-bit wide data bus, improving device transfer rates over original 8-bit SCSI.
STM-4 (signal): A Synchronous Transport Module level-4 in SDH networks, transmitting data at a nominal 622.08 Mbit/s line rate with overhead for management.
Data Transfer Rate: The amount of digital data moved from one place to another per unit of time.

Quick Knowledge Check

What is the approximate maximum throughput of SCSI (Fast Wide)?

10 megabytes per second

20 megabytes per second

40 megabytes per second

Which technology uses STM-4 (signal) units?

Legacy disk subsystems

Synchronous Digital Hierarchy optical networks

Parallel bus data transfer

Why is the conversion between SCSI (Fast Wide) and STM-4 approximate?

Because both units measure the same type of data transfer

Because they represent fundamentally different transmission methods

Because STM-4 has no overhead

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