Automated Main Distribution Frame
Encyclopedia
Automated Main Distribution Frame (AMDF), (automated switching matrix, automated distribution frame, Loop Management System (LMS)), a technology to provide connectivity between subscriber (local loop
, outside plant
) - and office equipment (inside plant
) lines in a telephone exchange
(central office, CO) main distribution frame
(MDF).
At the beginning of the 21st century the connections (n-subscriber lines and m-office equipment lines) are established or removed manually using a twisted pair of copper wires (jumper).
An automated main distribution frame provides, after an initial installation of all relevant subscriber- and office equipment lines, remote controlled and locally performed connectivity by switching via the switching matrix of an AMDF.
Advantages of automated main distribution frame include reduced switching time, reduced errors in execution and documentation, no truck-roll for each subscriber connection to be established, and reduction of operational expenditures (OPEX). These advantages are typically only off-setting the initial investment in the AMDF equipment in places with relatively high labour cost and an "active" telephony market where subscribers have a choice of multiple service providers leading to many MDF changes.
Field trails had been performed successfully. A large industrial deployment did not take place (Status: 2009)
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...
, outside plant
Outside plant
In telecommunication, the term outside plant has the following meanings:*In civilian telecommunications, outside plant refers to all of the physical cabling and supporting infrastructure , and any associated hardware located between a demarcation point in a switching facility and a demarcation...
) - and office equipment (inside plant
Inside plant
In telecommunication, the term inside plant has the following meanings:*All the cabling and equipment installed in a telecommunications facility, including the main distribution frame and all the equipment extending inward therefrom, such as PABX or central office equipment, MDF heat coil...
) lines in a telephone exchange
Telephone exchange
In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls...
(central office, CO) main distribution frame
Main distribution frame
In telephony, a main distribution frame is a signal distribution frame for connecting equipment to cables and subscriber carrier equipment . The MDF is a termination point within the local telephone exchange where exchange equipment and terminations of local loops are connected by jumper wires...
(MDF).
At the beginning of the 21st century the connections (n-subscriber lines and m-office equipment lines) are established or removed manually using a twisted pair of copper wires (jumper).
An automated main distribution frame provides, after an initial installation of all relevant subscriber- and office equipment lines, remote controlled and locally performed connectivity by switching via the switching matrix of an AMDF.
Advantages of automated main distribution frame include reduced switching time, reduced errors in execution and documentation, no truck-roll for each subscriber connection to be established, and reduction of operational expenditures (OPEX). These advantages are typically only off-setting the initial investment in the AMDF equipment in places with relatively high labour cost and an "active" telephony market where subscribers have a choice of multiple service providers leading to many MDF changes.
Field trails had been performed successfully. A large industrial deployment did not take place (Status: 2009)
External links
- IEC loop management system (LMS)