Title:        *DSL Reference
By:           James Bensley
Created:      07/12/2012
Last Updated: 05/01/2016
Corrections:    jwbensley <at> gmail <dot> com

xDSL Comparison
ADSL1 Reference
ADSL1 Topology Models
ADSL1 Protocol Stack
ADSL2+ Reference
SHDSL Reference


G.991.2 Annex F (G.SHDSL)
Single-pair high-speed digital subscriber line services compliant with G.991.2 Annex F allow for symetrical speeds of upto 5696kbit/s per copper pair. Trellis Coded Pulse Amplitude Modulation (TCPAM) is used to extended the symmetrical speed reach over longer distances however the service operates in the frquency ranges of POTS and ISDN meaning SHDSL can not coeixst with other services on an PSTN line (of be used with an ADSL style microfiler).

Frequency Overview (without POTS):
Each sub-carrier is centered on the frequency N*4.3125Khz

     0 POTS      End of POTS    Gaurd Band Start    Gaurd Band End     Upstream Start    Upstream Pilot    Upstream End    Downstream Start    Downstream Pilot     Downstream End    Nyquist Frequency