Local Loop Unbundling (LLU) - Possible scenarios


1: Plain Old Telephony Service (POTS) and ADSL, DSL or VDSL from the same service provider.

The standard set up consists of voice and broadband being supplied by the main telephone company - usually called the incumbent and often known as the Incumbent Local Exchange Carrier (ILEC). This supplier was previously the only supplier in the country and owns all the copper lines and cross connection distribution points. Fault diagnoses is simply as one supplier is responsible for all the services provided.


Single Incumbent Phone and Broadband Service


2: Plain Old Telephony Service (POTS) from an ILEC and ADSL, DSL or VDSL from an Internet Service Provider (ISP).

With Local Loop Unbundling another service provider can offer the ADSL, DSL or VDSL service leaving the incumbent with the voice telephone line. This results in 2 seperate bills, one for the phone line to the ILEC and a second to the ISP for the Broadband. The handover frame is the interconnect between the two companies and the ownership rules are based round this. The ILEC is responsible for all connections up to the HDF and out from the HDF to the customers Network Terminating Equipment (NTE). Fault diagnoses becomes more complicated as each supplier tries to prove the fault is with the other one.


Incumbent and ISP for phone and Broadband