What Is This Tool?
This tool converts data transfer values from STS1 (payload), a SONET payload capacity unit, to modem (300), a low-speed modem rate. It helps translate high-speed network capacities into legacy modem equivalents for various technical and historical uses.
How to Use This Tool?
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Enter a value in STS1 (payload) to convert
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Choose the target unit as modem (300)
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Click convert to see the equivalent modem (300) rate
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Use the conversion results for network planning or historical comparisons
Key Features
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Converts data transfer units between STS1 (payload) and modem (300)
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Shows conversion based on established rate: 1 STS1 (payload) equals 165000 modem (300)
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Supports telecommunications infrastructure and telemetry analysis
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Browser-based and simple to use without installation
Examples
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1 STS1 (payload) equals 165000 modem (300)
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2 STS1 (payload) equals 330000 modem (300)
Common Use Cases
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Provisioning an OC‑1/STS‑1 circuit capacity for DS3 or DS1 channels
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Planning SONET ring capacity and service throughput agreements
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Mapping Ethernet or ATM signals into STS‑1 for optical transport
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Comparing modern SONET payloads to vintage modem speeds
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Analyzing low-rate telemetry and remote control communication links
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Documenting and studying early dial-up modem technologies
Tips & Best Practices
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Remember the modem (300) rate reflects a fixed low speed, not suitable for modern high-speed links
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Account for protocol overhead when applying throughput in network planning
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Use the conversion to assist in historical data interpretation or telemetry system design
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Confirm you are converting user data payload and not total line rate for accuracy
Limitations
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Modem (300) is a nominal unit representing very low data rate not intended for current networks
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Real-world throughput may vary due to line conditions and protocol overhead
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STS1 payload indicates user data capacity, excluding line overhead
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Conversion is ideal for comparison and planning, not precise throughput measurement
Frequently Asked Questions
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What does STS1 (payload) represent?
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STS1 (payload) represents the user-data capacity inside an STS1 frame in SONET networks, with a usable data rate of 50.112 Mbps.
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What is modem (300) used for?
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Modem (300) indicates a data rate of 300 bits per second, historically used for analog dial-up modems and low-speed telemetry links.
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Why convert STS1 (payload) to modem (300)?
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This conversion helps compare high-speed SONET payload capacities with legacy low-speed modem rates for compatibility, historical analysis, and telemetry adaptation.
Key Terminology
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STS1 (payload)
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The user-data capacity contained within an STS1 frame in SONET, typically at 50.112 Mbps.
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Modem (300)
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A unit representing a data-transfer rate of 300 bits per second, common in early analog dial-up modems.
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Synchronous Payload Envelope (SPE)
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The specific portion of an STS1 frame carrying user data in SONET networks.