Loop extenders have various options:
- The number of ports
- The amplification level
- Input power source
- DSL type supported
Number of Ports
Many loop extenders have the option to deploy 1, 2, 4, 8 or 24 ports.
The lowest amplification level is in the subscriber line power versions (like AER800-1PL). These units are limited to using the switch power available without drawing dial tone, so there is a physical limit to the amplification possible. A slightly higher amplification is available with the express power series. Because these devices have access to a higher voltage level on an express power pair, there is more power available to do ADSL amplification. You can get about 1 Mbps improved performance with express power. The ipTV booster uses a higher voltage 155vDC express power and as a result can improve the bandwidth even more. The CAF booster (AER800-1PC) is unique in that it also offers upstream amplification to help you reach that 1 Mbps goal from the FCC Connect America Fund.
Input Power Source
Most loop extenders require an extra power pair to power up to 8 subscriber lines. The express power pair requires a special central office or customer premise power supply to provide 116vDC or 155vDC. However, the AER800-1PL can run off the 48vDC available on the subscriber line and needs no additional pairs or power supplies.
Annex A is the most widely deployed DSL Type in the USA and is supported by AER800-1P, AER800-1PL, AER800-1PC and AER800-1PB.
Annex M is available in the AER800-1PM series for uses where the 1Mbps UPSTREAM limit of Annex A is not sufficient.
VDSL is available in another section on this website.