Resilience & Diversity

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Introduction

On Demand connections are based on "unprotected" circuits, which are mesh protected across the Colt metro packet and long distance core network with an unprotected tail between the core network PoP serving the local access link and the customer premises (e.g. an enterprise office). This means that the majority of the service is protected - only the final mile tail is unprotected.

Circuits that are provided between key data centres are routed directly across Colt’s backbone network and are end-end protected by default (i.e. there is no unprotected tail). This also applies to cloud connections where the customer port is in a key data centre.

Circuits are presented on a single interface at the A and B end locations.

At locations that are on-net for Colt (i.e. connected directly to the Colt fibre network), diversity between a pair of On Demand ports can be provided. Diversity is available in all Colt countries in Europe and North America.

Diversity

In Demand ports can be provided with or without physical diversity. Where diversity is requested, the two ports in the diverse pair are provided across two separate fibre paths and equipment. Where requested, the ports can be provided in two physically separate PoP locations within the same building. The two ports in the diverse pair can also be provided in two physically separate buildings.

Diversity is a premium feature which attracts a higher charge on the 1st port in the dual port pair, and any Ethernet, Internet or Cloud connections that are attached to that port.

Customers can build their own topologies as required. For example, a pair of diverse access ports at an A end enterprise building, virtual cloud ports in physically separate cloud on-ramp locations and a pair of circuit connections between the access ports and cloud ports.

Port diversity is requested when a new port is ordered. There are four options:

  1. No Diversity - when a single port without diversity is required
  2. Diverse from existing port - where a new port is required that is diverse from an existing (live) port
  3. Diverse from new port (duplicate) – where two new ports are required, with identical settings (same location, same interface type)
  4. Diverse from new port (different) – where two new ports are required, with different settings (e.g. a different location or interface type)

Please note that diversity is not available on ports in offnet or hybrid on-net locations.

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