Last-mile dark-fibre infrastructure that provides unrestricted connectivity between Tachyon aggregation nodes and customer sites.

Helios is a key component of our last-mile dark-fibre network. Together with Tachyon nodes and Peregrine or Calypte links, it lets you connect directly to your customers premises using the most reliable and unimpeded communications technology available today.


Helios links connect your customer sites to our Tachyon nodes, enabling you to aggregate traffic onto your core network. Helios infrastructure is normally deployed in a star topology.

Helios architecture diagram

Data sheet

Connectivity options Tachyon node to customer access site
Once-off connection fee Yes
Billing Monthly
Flat rate
Discount criteria Rebate on monthly fee for additional Helios links to same Tachyon node
Lease term Fixed
24 months, renewable
Fibre pair options Single
Redundancy Optional linear diverse link back to the Tachyon node
Service level 8-hour mean time to repair

Terms and conditions

  1. Helios is only available within a 5km proximity of a Tachyon nodes.
  2. As such, one of the termination points must always be a Tachyon node.
  3. You are responsible for providing a suitable termination facility on your premises
  4. The preferable termination facility is the ‘meet-me-room’ within the access site.
  5. Costs exclude providing reticulation between the ‘meet-me-room’ to the end- customer’s premises. This cost is for your account.
  6. If the building already has existing reticulation, DFA will install its own in-building reticulation, in accordance with the rules of the landlord.
  7. Helios links must be ‘on-net’ or within 250m line of sight distance from the private property boundary.
  8. Each distinct Helios site is connected by a separate Helios link, however multiple sites can be connected to a single Tachyon node.
  9. Locations of planned Tachyons may change.
  10. Consequently, quotes based on planned Tachyon locations will change, should the final rollout differ from the planned rollout.
  11. You may not use Helios links to connect your core nodes to each other or to Tachyon nodes.
  12. Customer core nodes are defined as (but are not limited to) data centres, peering points, switching centres or any facility you use  to connect to multiple third party providers.
  13. Helios may not be used to link multiple end-customers to DFA’s network.
  14. Helios may not be used for aggregating multiple customers in the same or adjacent buildings.
  15. Each customer access site requires its own distinct link.
  16. The monthly flat-rate cost is subject to change after the first 24 months.
  17. If you have not purchased a Tachyon node service to complement your Helios service, and will instead be using Helios as a mechanism to connect to a Calypte backhaul, a monthly cross-connection fee will apply per link.
  18. Volume and term discount brackets are not applicable to Helios.
  19. Longer lease terms can be negotiated for the purposes of keeping lease payments fixed.
  20. Two distinct Helios links from the same building may not terminate in separate Tachyon nodes.
  21. If you require a diverse Helios link, this must be requested when ordering and commissioning.
  22. If a Helios link is ordered for diversity purposes, this needs to be clearly stated at the time of ordering.
  23. The cost for a diversity link will be in line with regular Helios pricing. Any additional build costs will be for your account.
  24. Diversity links for redundancy purposes are available on request and are subject to a technical feasibility exercise.
  25. A three-month notice period applies for decommissioning a Helios link.
  26. Penalties apply for decommissioning links before the end of their lease term and are detailed in the lease agreement.
  27. Penalties might be waived if a replacement link order is placed at the time of an early link decommissioning (for the same or higher monetary value as the decommissioned link).
  28. Replacement link orders must be “on net” and the replacement link is subject to a new full term.
  29. Each distinct replacement link lease term will be treated as a new lease and as such, start from a new inception date.