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Modulation is used to modify the data signal transmitted over the phone line. QAM is a modulation method used and can be implemented in either one of two different competing standards, CAP or DMT. CAP is less common and not considered as "standard" as DMT. Many providers started using CAP and then migrated to DMT. DMT allows for the connection of customers living further from the DSLAM location, and is capable of higher speed. The telcos that switched from CAP to DMT also implement PPPoE with the change. The Cisco 675 was a common CAP only DSL modem/router while the Cisco 678 is capable of both CAP and DMT (with limited speed) after a firmware upgrade. The [[Speedstream 4200]] is a common DMT modem/router used in moden ADSL installations and is made by the Siemens Corporation.Modulation is used to modify the data signal transmitted over the phone line. QAM is a modulation method used and can be implemented in either one of two different competing standards, CAP or DMT. CAP is less common and not considered as "standard" as DMT. Many providers started using CAP and then migrated to DMT. DMT allows for the connection of customers living further from the DSLAM location, and is capable of higher speed. The telcos that switched from CAP to DMT also implement PPPoE with the change. The Cisco 675 was a common CAP only DSL modem/router while the [[Cisco 678]] is capable of both CAP and DMT (with limited speed) after a firmware upgrade. The [[Speedstream 4200]] is a common DMT modem/router used in moden ADSL installations and is made by the Siemens Corporation.[[Category:Telephone]]