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Frequently Asked Questions

Why should I use 800G optics?

  • Increased capacity—800G optics offer twice the capacity of 400G optics, allowing for faster data transmission.

  • Higher port density—One 800G optic can replace two 400G optics, providing a higher port density and easier aggregation of 400G optics.

  • Scalability—800G optics are compatible with upcoming network devices and can support constantly evolving deployment scenarios.

Which 800G optics does Juniper offer?

See Hardware Compatibility Tool for a list of all the 800G optics offered by Juniper, along with their detailed specifications.

Which 800G optics are supported on my device?

See Hardware Compatibility Tool for a list of the supported optics for your device.

Can I use a third-party optic with my device?

We recommend that you use only optical transceivers and optical connectors purchased from Juniper Networks with your Juniper Networks device.

CAUTION:

The Juniper Networks Technical Assistance Center (JTAC) provides complete support for Juniper-supplied optical modules and cables. However, JTAC does not provide support for third-party optical modules and cables that are not qualified or supplied by Juniper Networks. If you face a problem running a Juniper device that uses third-party optical modules or cables, JTAC may help you diagnose host-related issues if the observed issue is not, in the opinion of JTAC, related to the use of the third-party optical modules or cables. Your JTAC engineer will likely request that you check the third-party optical module or cable and, if required, replace it with an equivalent Juniper-qualified component.

Use of third-party optical modules with high-power consumption (for example, coherent ZR or ZR+) can potentially cause thermal damage to or reduce the lifespan of the host equipment. Any damage to the host equipment due to the use of third-party optical modules or cables is the users’ responsibility. Juniper Networks will accept no liability for any damage caused due to such use.

What are the form factors supported on 800G optics?

Juniper supports OSFP800 and QSFP-DD800 transceivers.

OSFP transceivers are larger than QSFP-DD transceivers, and can handle higher power dissipation.

What are the speeds supported on an 800G optic?

800G optics can support a range of speeds, depending upon their type. They can support:

  • A single port of 800 Gbps

  • Two ports of 400 Gbps

  • Four ports of 200 Gbps

  • Eight ports of 100 Gbps

What are the standards followed by 800G optics?

800G transceivers and modules adhere to the IEEE 802.3-2022 standards. See Standards for 800G Transceivers for a complete list of standards.

What does the name of the optic mean?

Optics follow a naming convention where the product name contains the form factor, data rates, and lane distribution of the optic. See Juniper Optical Product Numbers for a detailed example.

What is meant by DR, FR, LR, and VR in an optic?

  • Datacenter Reach (DR)—Transceivers designed for short range data transmission over single-mode fibers.

  • Forward Reach (FR)—Transceivers desgined for medium range data transmission over single-mode fibers.

  • Long Reach (LR)—Transceivers designed for long range data transmission over single-mode fibers.

  • Very Short Reach (VR)—Transceivers designed for very short range data transmission over multi-mode fibers.

What is the lane distribution on 800G optics?

800G optics use 8 parallel lanes, each of which support 100 Gbps. Multiplexing occurs over multiple fiber pairs, or using a combination of fiber and wavelength multiplexing.

What are the modulation techniques supported on 800G optics?

800G optics use Pulse Amplitude Modulation 4-level (PAM4). PAM4 combines two bits into a single symbol with four amplitude levels, enabling you to transmit twice as much data. It has a high signal-to-noise ratio which requires shorter transmission distances. It requires Forward Error Correction (FEC) to handle the loss of signal integrity. You must configure FEC at both ends of the 800G link.

Juniper 800G optics do not support Non-return to Zero (NRZ) modulation.

What is Clock Data Recovery (CDR)?

Clock Data Recovery is the process of extracting timing information from a data signal. The receiver uses the timing information embeddded in the data signal to determine the frequency of the transmitter's clock. The receiver then uses this information to re-time the signal to ensure accurate data retrieval and transmission. CDR helps to reduce jitter and improve signal integrity and reach.

What are the components of an 800G optic architecture?

800G (x8) optics are composed of the following:

  • 800G Host Platform

  • 8x100G Electrical Interface

  • PAM4 Digital Signal Processor/Clock Data Recovery (DSP/CDR)

  • Drivers (8)

  • Modulators (8)

  • 8x100G Optical Interfaces

  • Transimpedance Amplifiers (TIA) (8)

  • Photo-Detectors (8)

See 800G (X8) Transceiver Architecture for a detailed explanation of each component.

What are breakout capability and breakout cables?

Breakout capability is the ability to split a high-speed optical link into multiple smaller, lower-speed links. This is also called channelization. Breakout capability is crucial for optimizing the use of available bandwidth and physical infrastructure in various networking scenarios.

You can configure port speeds at the chassis level or the interface level. You can channelize an individual port, a block of ports, or a quad of ports.

Breakout cables have a single transceiver at one end and multiple transceivers at the other end. You can use breakout cables to physically split a single high-speed port to multiple lower-speed ports.

For more details, see Breakout Capability.

How is breakout/channelization supported on my device?

See Port Checker for details on channelization support for your device.

What are single-mode and multi-mode fibers?

Single-mode fibers (SMF) are designed to trasmit only one mode of an optical signal at a time. They have a core diameter of 9 microns. They have low attenuation and can support higher data rates and longer transmission distances.

Multi-mode fibers (MMF) can transmit multiple optical signals at the same time. They have a core diameter between 50 to 62.5 microns. They are easier to handle and manufacture as compared to SMF. They have higher attenuation and are used to transmit data over shorter distances.

What are the different types of cables used in 800G optics?

800G optics use direct attach cables (DAC) and active optical cables (AOC). See Cable Types and Length for details.

For a list of AOC and DAC cables supported by Juniper, see Hardware Compatibility Tool.

What is the length of cables used for 800G optics?

The cable length supported on 800G optics ranges from 0.5 m to 2000 km. Check the details of your transceiver for the specific distance or range.

What are the different types of connectors used in 800G optics?

800G optical cables use MPO-16/APC, dual MPO-12/APC, dual duplex LC/UPC, and dual CS/UPC connectors. They can also use quad SN or MMC connectors. See Connector Types for more details.

What is the power requirement for 800G optics?

OSFP and QSFP-DD optics require 16 W to 18 W of power. ZR/ZR+ optics require up to 30 W.

What is the difference between OSFP and OSFP-RHS optics?

OSFP-RHS is an OSFP module with a riding heat sink instead of an integrated heat sink. The are two different form factors and cannot be supported on a common host. See Table 1 for more details.

What is the difference between OSFP and QSFP-DD optics?

OSFP and QSFP-DD are different physical form factors that support transmission speeds of 800 Gbps. See Comparison between OSFP and QSFP-DD Form Factors for a detailed comparison.

Can I plug OSFP modules into QSFP-DD ports or vice versa?

No. OSFP and QSFP-DD refer to optics with different form factors. An OSFP port supports only OSFP optics and a QSFP-DD port supports only QSFP-DD optics.

Can I plug 400G modules into 800G ports?

Yes, if the physical form factors are compatible.

Can I plug 800G modules into 400G ports?

We do not recommend plugging an 800G module into a 400G port. 400G optical ports cannot support the 100G per lane speeds that 800G ports can support.

Can there be an OSFP connector on one end of an 800G link and a QSFP-DD connector on the other?

Yes. OSFP and QSFP-DD connectors can interoperate with each other on the same link, provided the Ethernet media type is the same.

Can I plug a 100G QSFP module into a QSFP-DD port?

Yes. The QSFP-DD ports are compatible with the QSFP56, QSFP28, and QSFP+ ports.

You must configure the QSFP-DD port for a data rate of 100G (or 40G) instead of 400G or 800G.