Packet-Optical Technologies
Packet-Optical Technologies
Juniper Simplifies DCI with Innovative Coherent DWDM Line Card

Over two decades ago, when a friend of mine visited his parents in a remote countryside village in China, he had to first take train from Beijing to the provincial capital, then take a crowded coach on bumpy country roads to the county’s capital, next take passenger ship, and finally walk dozens of miles on the mountainous road to his parents’ village. The journey involved many forms of transportation, was exhausting, and took three days. Additionally, the logistics was difficult to manage and coordinate.


This problem also exists in networking industry. The explosion in data center traffic growth due to distributed applications such as distributed cloud applications, video streaming, and mobile applications is making it necessary to interconnect geographically dispersed locations to create a single hyper-scale logical resource pool. To achieve this interconnectivity, cloud operators have been deploying isolated packet and dense wavelength-division multiplexing (DWDM) equipment as separate domains with independent management tools. Just like my friend visiting his parents in the remote village, this infrastructure involves a diverse set of transportation domains and is difficult to manage.


The good news is that Juniper is now providing a perfect solution to this problem with the newly released Coherent DWDM Line card. Integrating DWDM into Juniper Networks® QFX10000 line of Switches (QFX10008 and QFX10016) eliminates these operational headaches by bringing packet and optical into a converged architecture, reducing space and power consumption, and eliminating the high cost of external transponder shelves.


The following graph illustrates how the traditional DCI can be simplified by integrating DWDM into Juniper Networks® QFX10000 line of Switches with this DWDM Line card.DCI_Collapse.PNG

 And here is an image of the actual Coherent DWDM Line card.VoodooLineCard.PNG

This innovative and feature-rich DWDM Line card offers density, performance, and economics for cloud-scale applications, simplifies cloud deployment by collapsing spine/DCI into a single network, and provides consistent management interface for both packet and optical using Junos OS. The follows are the feature highlights:


  • 19.2 Tbps per system with QFX10016
  • 25.6 Tbps per fiber pair with 128 channels
  • 1.2 Tbps per line card; 6x200 Gbps per line card
  • 1.2 Tbps Packet Forwarding Engine (PFE) with deep buffers and large forwarding information base (FIB)
  • 1.2 Tbps line rate IEEE 802.1AE Media Access Control Security (MACsec) encryption across all ports
  • Up to 12x100GbE, 256-bit encryption Superior Performance for Metro or Long-Haul Applications
  • Flex modulation to support both metro and long haul on the same line card
  • 120 km without amplification
  • 4,000 km with amplification
  • 200 Gbps DP-16QAM (approximately 1000 km)
  • 150 Gbps DP-8QAM (approximately 2,000 km)
  • 100 Gbps DP-QPSK (approximately 4,000 km)
  • Configurable modulation
  • Compatible and interoperable with Juniper’s existing DWDM Line cards on PTX and MX routers
  • Alien wavelength support over third-party line system
  • YANG data model
  • Junos OS CLI and SNMP
  • Supports IP over DWDM for L2 or L3 applications


With so many features and benefits, as soon as this innovative DWDM Line card is released, customers immediately fall in love with it. See Fredrik "Hugge" Korsbäck's blog New toys – 200G DWDM in Juniper QFX10000.


Thanks to the recent rapid development in China’s high speed railway infrastructure, now my friend just needs to take the train from Beijing directly to his home village, and his parents will be there at the station welcoming him with big smiles – there was a new station built near his parents’ village, so no more alternating between transportation modes, no more logistics hassles, and no more exhaustion.


The same is true with the release of Juniper’s DWDM Line card on QFX10000 line of Switches. The end result: happy customers.

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