VisionNet M505N - Page 15

2.B ADSL2+
ADSL – ADSL2+
Operating Frequency:
20 Khz – 2.2 Mhz
MaxSpeed:
24Mbps DS, 2.2Mbps US
General Operation:
ATM (PTM on some CO equipment)
Item 3 xDSL Properties
Below, is a brief summary of some xDSL protocols to familiarize yourself with:
VisionNet M504 / M505N R3 Page 15 of 62 User Manual Rev 0.1c
Standard ITU Standard
ADSL G.992.1 1.1
ADSL2 G.992.3 1.1
ADSL2+ G.992.5 2.2
Max
Frequency
(Mhz)
Class Protocol Standard Notes
ADSL
G.DMT ITU G.992.1 8Mbps DS / 1.3 Mbps US
ADSL
G.Lite ITU G.992.2 1.5 Mbps DS / 512 kbps US
ADSL
T1.413 ANSI T1.413 8Mbps DS / 1.3 Mbps US
ADSL2
ADSL2 ITU G.992.3 12 Mbps DS / 800 kbps US
ADSL2
Annex L ITU G.992.3 Increases ADSL2 Reach to 7 km (23k ft)
ADSL2+
ADSL2+ ITU G.992.5 Doubles Frequency Range from 1.1Mhz to 2.2 Mhz.
ADSL2+
Annex M ITU G.992.5 Changes DS / US frequency split, to double US to max 3.3 Mbps
Capability
Bitswap ITU G.992.1 Allows for movement of bit transmission between "bins"
Capability
SRA ITU G.992.5 ADSL2+: Allows for rate changes without re-training
Capability
Trellis Multiple Modulation Scheme Rate / Reach performance improvement
PhyR Proprietary ADSL2+: Physical Layer ReTransmission - Broadcom support only
Capability
Interleave ITU G709 Forwarding Error Correction / delay preferred <5ms
Capability