Sub Loop Unbundling (SLU)

27 Nov 2021

Sub Loop Unbundling (SLU)

SLU lets you link into our networks to give your customers broadband at a local level. The “sub loop” is a partial local loop, which allows for further network coverage. It connects the network termination point at your customer’s home or business to either a concentration point or intermediate access point in the local network. 

We provide, maintain and repair the SLU circuit, which has both shared metallic path (SLU SMPF) and metallic path (SLU MPF) options.

How it works

An SLU circuit is a two-wire point-to-point (P2P) metallic transmission path. It uses copper wire tie cables to connect your customer’s home or office and your SLU equipment to a sub loop connection point (SLCP). This is normally the primary connection point (PCP) in our access network.

Any equipment you use must conform to our access network frequency plan (ANFP). This industry standard is published on the NICC website, and is also in the product description below.


  • Offer high speed broadband by putting equipment near the PCP.
  • Offer both MPF and SMPF.
  • No need to install equipment in exchanges, helping you keep costs down.

Help and support

You can find information about using this site, advice on services and help with your account on our help and support pages.

Industry information

Are you interested in having a say in how the industry meets its customers’ needs? You can find out more about getting involved on our industry forum pages. 

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