What Is This Tool?
This tool enables conversion from STM-4 (signal), a high-speed optical transmission module, to SCSI (Fast), a legacy parallel storage interface standard. It helps users compare data transfer rates across these two very different technologies.
How to Use This Tool?
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Enter the value in STM-4 (signal) units you want to convert.
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Select STM-4 (signal) as the source unit and SCSI (Fast) as the target unit.
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View the converted value in SCSI (Fast) units immediately.
Key Features
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Converts data transfer units between STM-4 (signal) and Fast SCSI.
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Supports understanding of performance differences between optical and parallel storage interfaces.
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Provides a direct conversion factor for quick calculations.
Examples
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2 STM-4 (signal) equals 15.552 SCSI (Fast).
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0.5 STM-4 (signal) equals 3.888 SCSI (Fast).
Common Use Cases
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Evaluating data transfer rates for inter-city optical backbone links and legacy storage systems.
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Comparing high-speed optical signals with older parallel storage buses for system compatibility.
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Planning performance integration in environments combining telecom networks and legacy storage equipment.
Tips & Best Practices
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Use this tool for relative data transfer rate comparisons rather than exact interchangeability.
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Consider the different protocols and physical interfaces when applying conversion results.
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Use conversion to aid planning in mixed legacy and modern technology setups.
Limitations
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STM-4 data rate in Mbit/s and SCSI (Fast) throughput in MB/s differ in measurement units and context.
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Direct conversions are approximations that reflect capability rather than exact data transfer equivalence.
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Physical and protocol differences mean units require hardware interfaces for actual data transfers.
Frequently Asked Questions
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What does STM-4 (signal) represent?
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STM-4 (signal) is an optical transmission standard in the Synchronous Digital Hierarchy with a line rate of 622.08 Mbit/s used for multiplexing digital traffic.
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What is SCSI (Fast) used for?
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Fast SCSI is a legacy parallel bus standard used to connect storage devices like hard drives and tape drives to computers, with a typical data throughput of about 10 MB/s.
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Can I directly replace STM-4 with SCSI (Fast) devices?
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No, because STM-4 and SCSI (Fast) operate on different physical media and protocols, they are not directly interchangeable without appropriate interface hardware.
Key Terminology
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STM-4 (signal)
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A Synchronous Transport Module level‑4 in SDH with a line rate of 622.08 Mbit/s, used to transport digital traffic in optical networks.
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SCSI (Fast)
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A legacy parallel SCSI bus that improves on the original SCSI by increasing data transfer speed to about 10 MB/s for connecting storage devices.
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Data Transfer Rate
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The amount of digital data moved from one place to another in a given time period, commonly measured in bits per second or bytes per second.