| Term |
Discription |
| DSL |
Digital Subscriber
Lines
- Modems on either end of a single
twisted pair that delivers ISDN Basic Rate Access. |
| xDSL |
Collective term that refers to all DSL types |
| ADSL |
Asymmetric Digital Subscriber Line - supports
data rates of from 1.5 to 9 Mbps when receiving data (downstream rate)
and from 16 to 640 Kbps when sending data (upstream rate). |
| SDSL |
Symmetric Digital Subscriber Line - supports
data rates up to 3 Mbps. - name not adopted
by a standards group but is being discussed by ETS |
| HDSL |
High-Data-Rate DSL (HDDSL) - Modems
on either end of one or more twisted pair that deliver T1 speeds. Currently
(4/2000) requires two lines. |
| SDSL |
Single-line DSL (SLDSL) |
| VDSL |
Very High Speed Digital Subscriber Line - data
rates in the 13 Mbps - 55 Mbps range over short distances, usually between
1000 and 4500 feet (300 - 1500 meters), of twisted pair copper wire. The
shorter the distance, the faster the connection rate. |
| RADSL |
Rate Adaptive Digital Subscriber Line - A
version of ADSL where modems test the line at start up and adapt their
operating speed to the fastest the line can handle. |
| ISDN |
Integrated Services Digital Network - data
rates up to 56 kbps on a phone line also used for voice, or up to 128 kbp
on a phone line used for data only. |
The
DSL Center