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What is the difference between DR4 and SR8?
Knowledge Base + 2024.01.09

DR4 (Dense Wavelength Division Multiplexing 4) and SR8 (Short Range 8) are designations for specific types of optical transceivers used in high-speed data transmission. These designations refer to the configuration and specifications of the transceivers, particularly in terms of their intended applications, data rates, and reach. Here are the key differences between DR4 and SR8:

  1. Application and Reach:

    • SR8 transceivers are designed for relatively short-distance connections within a data center or campus environment.

    • They use eight parallel fibers for transmitting and receiving data.

    • SR8 transceivers are optimized for short-range applications, typically up to 100 meters.

    • DR4 transceivers are typically designed for longer-distance connections in data center environments.

    • They use Wavelength Division Multiplexing (WDM) technology to transmit signals over four different wavelengths.

    • The reach of DR4 transceivers is longer compared to SR8, often reaching distances up to 500 meters to 2 kilometers.

    • DR4 (Dense Wavelength Division Multiplexing 4):

    • SR8 (Short Range 8):

  2. Number of Fibers:

    • SR8 transceivers use a parallel fiber configuration, with each fiber carrying an independent data channel. They use eight fibers for transmitting and eight fibers for receiving.

    • DR4 transceivers typically use a duplex LC (or MTP/MPO) connector and transmit data over four separate fibers, each carrying a different wavelength.

    • DR4:

    • SR8:

  3. Data Rate:

    • Both DR4 and SR8 transceivers are designed for high-speed data transmission.

    • DR4 transceivers often support data rates of 100 Gbps per wavelength, resulting in an aggregate data rate of 400 Gbps.

    • SR8 transceivers support an aggregate data rate of 400 Gbps, with each of the eight parallel channels operating at 50 Gbps.

  4. Connector Type:

    • SR8 transceivers use parallel fiber connectors, typically with an MTP/MPO interface.

    • DR4 transceivers commonly use duplex LC connectors or MTP/MPO connectors for the WDM channels.

    • DR4:

    • SR8:

In summary, DR4 and SR8 transceivers are optimized for different reach and connectivity requirements within high-speed networking environments. DR4 is designed for longer-distance connections using WDM technology, while SR8 is optimized for shorter-range applications with a parallel fiber configuration. The specific choice between DR4 and SR8 depends on the network's distance requirements and the application's specifications.