Sub-loop unbundling
Encyclopedia
In the telephony
business, Sub-loop unbundling (SLU) is the process by which a sub-section of part of the local loop
is unbundled. In practice this often means the competitor placing a small street cabinet with a DSLAM, next to a telco
local copper aggregation cabinet or Serving area interface
and using a 'tie cable' to connect to the last part of the local loop into customers' homes. The short range brings superior bit-rate performance, compared to normal Local loop unbundling (LLU)
. The local loop can be accessed using shared metallic path or full metallic path facilities. In the latter, which was first deployed in the UK in the village of Lyddington
by Rutland Telecom, the telco loses remote access to the part of the local loop between the cabinet and the customer's premises unless the SLU Operator allows IP-level access via their DSLAM.
The street cabinet is connected to a point of presence
on the national network using long-range wireless or fibre.
Where VDSL or VDSL2 is used to deliver a service, competing SLU Operators at the same site must adhere to tie cable length limitations to prevent interference. Other restrictions are in force to prevent interference with ADSL or ADSL2+ frequencies on the local loop from the serving exchange. In the UK the incumbent telco aggregation cabinets are known as Primary Connection Points (PCPs) and each one is assigned a CAL (Cabinet Assigned Loss) value based on its distance from the serving exchange.
Telephony
In telecommunications, telephony encompasses the general use of equipment to provide communication over distances, specifically by connecting telephones to each other....
business, Sub-loop unbundling (SLU) is the process by which a sub-section of part of the local loop
Local loop
In telephony, the local loop is the physical link or circuit that connects from the demarcation point of the customer premises to the edge of the carrier or telecommunications service provider's network...
is unbundled. In practice this often means the competitor placing a small street cabinet with a DSLAM, next to a telco
Incumbent local exchange carrier
An ILEC, short for incumbent local exchange carrier, is a local telephone company in the United States that was in existence at the time of the breakup of AT&T into the Regional Bell Operating Companies , also known as the "Baby Bells." The ILEC is the former Bell System or Independent Telephone...
local copper aggregation cabinet or Serving area interface
Serving area interface
The serving area interface or service area interface often called B-box, cross-connect box, cross box, ped , or access point is an outdoor telecommunications cabinet usually mounted on the ground on cable right-of-ways, but sometimes also on telephone poles...
and using a 'tie cable' to connect to the last part of the local loop into customers' homes. The short range brings superior bit-rate performance, compared to normal Local loop unbundling (LLU)
Local loop unbundling
Local loop unbundling is the regulatory process of allowing multiple telecommunications operators to use connections from the telephone exchange to the customer's premises...
. The local loop can be accessed using shared metallic path or full metallic path facilities. In the latter, which was first deployed in the UK in the village of Lyddington
Lyddington
Lyddington is a village in the county of Rutland in the East Midlands of England. There are two public houses, The Marquess of Exeter and The Old White Hart....
by Rutland Telecom, the telco loses remote access to the part of the local loop between the cabinet and the customer's premises unless the SLU Operator allows IP-level access via their DSLAM.
The street cabinet is connected to a point of presence
Point of presence
A point of presence is an artificial demarcation point or interface point between communications entities. It may include a meet-me-room.In the US, this term became important during the court-ordered breakup of the Bell Telephone system...
on the national network using long-range wireless or fibre.
Where VDSL or VDSL2 is used to deliver a service, competing SLU Operators at the same site must adhere to tie cable length limitations to prevent interference. Other restrictions are in force to prevent interference with ADSL or ADSL2+ frequencies on the local loop from the serving exchange. In the UK the incumbent telco aggregation cabinets are known as Primary Connection Points (PCPs) and each one is assigned a CAL (Cabinet Assigned Loss) value based on its distance from the serving exchange.