ITU G.992.3 Annex J
Encyclopedia
Annex J is a specification in ITU-T recommendations G.992.3 and G.992.5 for all digital mode ADSL with improved spectral compatibility with ADSL over ISDN, which means that it is a type of naked DSL
which will not disturb existing Annex B ADSL services in the same cable binder.
This specification has the same upstream/downstream frequency split of 276 kHz as Annex B, but does not have lower frequency limit of 138 kHz, allowing upstream bandwidth to be increased from 1 Mbit/s to 3.5 Mbit/s. This is similar to Annex M
, but Annex J can not have POTS
on the same line.
Naked DSL
A naked DSL is a digital subscriber line without a PSTN service — or the associated dial tone...
which will not disturb existing Annex B ADSL services in the same cable binder.
This specification has the same upstream/downstream frequency split of 276 kHz as Annex B, but does not have lower frequency limit of 138 kHz, allowing upstream bandwidth to be increased from 1 Mbit/s to 3.5 Mbit/s. This is similar to Annex M
ITU G.992.5 Annex M
Annex M is an optional specification in ITU-T recommendations G.992.3 and G.992.5 , also referred to as ADSL2 M and ADSL2+ M. This specification extends the capability of commonly deployed Annex A by more than doubling the number of upstream bits...
, but Annex J can not have POTS
Plain old telephone service
Plain old telephone service is the voice-grade telephone service that remains the basic form of residential and small business service connection to the telephone network in many parts of the world....
on the same line.