DWDM Transport Tech Info

Netnod has built a redundant Dense Wavelength Division Multiplexing (DWDM) network that interconnects the Netnod On-net locations in each metro area (Metro DWDM) as well as on-net locations throughout Sweden (Regional DWDM).

This network is used to provide  transport services (the “Transport Services”) to end customers. 

If the Customer needs transport between addresses outside of the on-net locations where Netnod has an established presence it is possible via Netnod to order an additional service - “Access connection” - to get access-fibre to this address.

If a cross-connect is needed within a data centre, this can also be provided as an additional service from Netnod.

Service Description

The Transport Services consist of:
-  a Layer 1 transmission service between any of the Netnod On-net locations. Below is a table of the different service types you can order.


Service type

Metro DWDM 10G

10G Ethernet

Metro DWDM 100G

100G Ethernet

Regional DWDM  10G

10G Ethernet

Regional DWDM  100G

100G Ethernet

Redundant Option (Add on Service)

Transport Services can optionally be ordered as a redundant service (“Redundant Service”). In this case, two instances of the transport services are established. The customer can use different A and B sides for the second instance if node-level redundancy is required. With the Redundant Service, Netnod will ensure that the two instances are diversely routed through the network.

Access Connection (Add on Service)

The Transport Services can optionally also be delivered with an access-connection (“Access-Connection”) either locally within a site or with a 3rd party fibre-vendor to an address close to the On-Net location. In these cases, the cost for the Access-Connection will be invoiced to the Customer.

Technical Description Transport Services

The Transport Services are provided over a transmission network consisting of DWDM equipment that transports the Transport Services between the sites of the connection.The Transport Services are delivered as an optical layer service with the use of modern DCI ( “DataCentre Interconnect”) equipment that multiplexes lower speeds into DWDM wavelengths which are then transported to the other site.


The DCI equipment is a Layer 1 device. All data sent via the connection is passed transparently point-to-point through the physical link layer and does not go through any Layer 2 (or above) infrastructure. 

Link fault Handling

By default the Transport Services has Link Fault Forwarding turned on. This means that a link-down or a loss-of-signal event in one end is forwarded to the other end.

Interface Specifications

The below combinations of client interfaces are possible with the Transport Services. 100G interfaces not listed below can be used but come with an additional cost.


Interface Type


Regional/Metro DWDM 10G



Regional/Metro DWDM 100G



Regional/Metro DWDM 100G



Regional/Metro DWDM 100G



* Extra setup fee for ER4 interfaces