Changes between Version 42 and Version 43 of Architecture/optical


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Timestamp:
Apr 17, 2020, 1:30:15 PM (4 years ago)
Author:
mpk2138
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  • Architecture/optical

    v42 v43  
    22
    33== Optical ==
    4 The optical connectivity layer in COSMOS allows an experimenter to reconfigure connectivity between devices at the L1 (physical) layer. This provides the ability to restructure the physical topology of the entire testbed, changing not just latency between nodes but how individual signals are routed, with no overhead, throughout the testbed.
     4This page describes the planned vision and current deployment of the COSMOS optical connectivity layer, a critical building block of the COSMOS testbed, used to enable high bandwidth and low latency networking and to support experimentation with emerging and future wireless technologies and applications [1, §4.3]. The optical connectivity layer in COSMOS allows an experimenter to reconfigure connectivity between devices at the L1 (physical) layer. This provides the ability to restructure the physical topology of the entire testbed, changing not just latency between nodes but how individual signals are routed, with no overhead, throughout the testbed.
     5
     6=== Planned Vision ===
     7The figure below describes the planned vision for COSMOS' optical network. As shown, a central Calient S320 320×320 space switch (SS) in the Data Center at Columbia provides a remotely configurable fiber plant network core. Each fiber supports 96 fully transparent channels, which are flexgrid configurable to provision 10/100 Gbps wavelengths. 20 ROADM units are connected to the central SS via 20×4 add/drop fiber pairs. In addition, 20×16 add/drop pairs connect the ROADM units to top of rack (ToR) switches and servers in the data center at Columbia. The 20 fiber pairs per ROADM can be reconfigured to support various requirements from connected servers through top-layer user applications orchestrated by an SDN controller. The central SS is directly connected via dark fiber (provided by !ZenFi and NYC) to the colocation site at 32 AoA that also houses the NYU data center [1, §4.3].
    58
    69[[Image(COSMOS_optical_core.jpg, width=750px)]]
    710
    8 === Space Switch ===
     11=== Hardware Components ===
     12
     13==== Space Switch ====
    914The Calient MEMS space switch is a 320x320 any-to-any optical circuit switch which allows an experimenter to redirect the entire optical link coming in from one fiber strand to another. The switch itself introduces ~2dB of loss to the signal and has a switching time of ~25ms. Configuration of the switch is possible via Openflow and netconf as well as several other methods.
    1015
    11 === ROADM ===
     16==== ROADM ====
    1217There are several Lumentum Whitebox20 degree-one ROADMs (reconfigurable optical add/drop multiplexer) in COSMOS, the majority of which are at the core datacenter. Each of the ROADMs features 20 ports and allows individual wavelengths to be redirected from one fiber strand to another. This permits physically separate network links to share fibers yet still be routable (with no overhead delay) to physically different end-points. The ROADMs are compatible with C-band DWDM. Configuration of the ROADMs is done via netconf.
    1318
    1419=== Pilot Phase Implementation Progress ===
    1520
    16 On the 2nd February 2020 COSMOS Optical network consists of next elements:
     21As of 17 April 2020, the COSMOS optical network consists of the following elements:
    1722
    18 || [[Image(COSMOS optical topology_V12.png, width=750px)]] ||
     23|| [[Image(COSMOS optical_topology_V14.png, width=750px)]] ||
    1924|| [[Image(Cosmsos Fiber Diagram.png, width=750px)]] ||
    2025
    … …  
    2429
    2530|| [[Image(cosmos_long_reseach_v2.png, width=1400px)]] ||
     31
     32=== References ===
     33
     34[1] D. Raychaudhuri, I. Seskar, G. Zussman, T. Korakis, D. Kilper, T. Chen, J. Kolodziejski, M. Sherman, Z. Kostic, X. Gu, H. Krishnaswamy, S. Maheshwari, P. Skrimponis, and C. Gutterman, “Challenge: COSMOS: A city-scale programmable testbed for experimentation with advanced wireless,” in ''Proc. ACM MOBICOM’20 (to appear)'', 2020.
    2635
    2736=== Changelog ===
    … …  
    3544
    36453/30/2020: Upload SDN controller guide: Jiakai Yu
     46
     474/17/2020: Update COSMOS Optical Topology and more information about planned vision: Manav Kohli