|
|
HDSL |
SDSL |
HDSL2 |
SHDSL |
|
Date Rate
|
T1 |
192Kbps-2.3Mbps |
T1 |
192Kpbs-2.36Mbps
or
384Kbps-4.72Mbps |
|
Pairs |
2 |
1 |
1 |
1 or 2 |
|
Line Code
|
2B1Q |
2B1Q |
TC-PAM |
TC-PAM |
|
EOC |
13bit Triple
Echo |
Proprietary |
24bit HDLC
type |
20bit HDLC type |
|
Pre-
activation |
None |
Proprietary |
Standards
based |
G.994.1 |
|
Rate
Adaptive |
No |
Yes |
No |
Yes |
|
Power
Back-off |
No |
No |
Yes |
Yes |
|
Repeaters
|
Yes |
No |
Yes |
Yes |
|
Timing
|
Plesiochronous |
Synchronous |
Plesiochronous |
Both |
|
Span Power
|
Yes |
Yes |
Yes |
Yes |
|
REACH |
|
2.360 Mbps
|
n.a. |
5.5kft |
n.a. |
6.5kft |
|
1.544 Mbps
|
CSA |
7kft |
CSA |
CSA |
|
784 Kbps
|
n.a |
CSA |
n.a. |
Beyond CSA (11 kft) |
|
384 Kbps
|
n.a |
13.5kft |
n.a. |
15.5kft |
