ADSL supports both voice and data at the same time, but it was created to allot more bandwidth downstream than upstream because it’s best for residential subscribers that usually need more downstream bandwidth for doing things like downloading video, movies, and music; online gaming; surfing; and getting emails—some that include sizeable attachments. ADSL will give you a downstream rate from 256Kbps to 8Mbps, but anything going upstream is only going to reach around 1Mbps.
POTS provides a channel for analog voice transmission and can transmit without a problem with ADSL over the same twisted-pair telephone line. Actually, depending on the type of ADSL, not just two, but three information channels commonly utilize the same wiring at the same time. This is why people can use a phone line and an ADSL connection at the same time and not affect either service.
ATM is the Data Link layer protocol typically used over the DSL layer 1 connection from the CPE that’s terminated at what’s known as the DSLAM—an ATM switch that contains DSL interface cards, or ATU-Cs. After ADSL connections meet their end at the DSLAM, it switches the data over an ATM network to something called an aggregation router—a layer 3 device where the subscriber’s IP connection then expires.
You know by now how important encapsulation is, so as you’ve probably guessed, any IP packets over an ATM and DSL connection must have this done. This happens in one of three ways (PPPoE,RFC1483 Routing,PPPoA), depending on your interface type and the service provider’s switch.
POTS provides a channel for analog voice transmission and can transmit without a problem with ADSL over the same twisted-pair telephone line. Actually, depending on the type of ADSL, not just two, but three information channels commonly utilize the same wiring at the same time. This is why people can use a phone line and an ADSL connection at the same time and not affect either service.
ATM is the Data Link layer protocol typically used over the DSL layer 1 connection from the CPE that’s terminated at what’s known as the DSLAM—an ATM switch that contains DSL interface cards, or ATU-Cs. After ADSL connections meet their end at the DSLAM, it switches the data over an ATM network to something called an aggregation router—a layer 3 device where the subscriber’s IP connection then expires.
You know by now how important encapsulation is, so as you’ve probably guessed, any IP packets over an ATM and DSL connection must have this done. This happens in one of three ways (PPPoE,RFC1483 Routing,PPPoA), depending on your interface type and the service provider’s switch.
No comments:
Post a Comment