Private un-contended and contended ADSL Service
ADSL allows customers to simultaneously use the telephone and enjoy data services over the same copper line. This is achieved by splitting the circuit into separate frequencies preventing the data signals from interfering with the standard telephone calls. ADSL is described as an asymmetric technology because the download speed is faster than the upload speed.
ADSL divides up the available frequencies within a circuit based on the assumption that most users download much more information than they send, or upload, therefore ADSL works best in environments such as remote sites accessing centralised data, i.e. a hub and spoke environment.8el has two ADSL product offerings, ADSL Standard and ADSL Plus. ADSL Plus is an un-contended service (1:1). ADSL Standard is a contended service (2:1, 5:1, 10:1, 20:1 and 50:1.)
Both services are available with an upload speed which is set at 256Kbps; download speeds range from 256Kbps to 2Mbps.
| Download bandwidth | Upload bandwidth | Contention | ISDN backup |
| 2Mbps | 256Kbps | 1:1, 2:1, 5:1, 10:1, 20:1, 50:1 | *128Kbps |
| 1Mbps | 256Kbps | 1:1, 2:1, 5:1, 10:1, 20:1, 50:1 | *128Kbps |
| 512Kbps | 256Kbps | 1:1, 2:1, 5:1, 10:1, 20:1, 50:1 | *128Kbps |
| 256Kbps | 256Kbps | 1:1, 2:1, 5:1, 10:1, 20:1, 50:1 | *128Kbps |
| * Optional ISDN backup when using a Cisco 1800 router. | |||
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