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ITU-T G.994.1

Handshake procedures for digital subscriber line transceivers

active, Most Current
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Organization: ITU-T
Publication Date: 1 November 2018
Status: active
Page Count: 916
scope:

This Recommendation defines signals, messages and procedures for exchanging these between digital subscriber line (DSL) equipment, when the modes of operation of the equipment need to be automatically established and selected, but before signals are exchanged which are specific to a particular DSL Recommendation.

For interrelationships of this Recommendation with other ITU-T G.99x-series Recommendations, see Recommendation ITU-T G.995.1 (informative).

The principal characteristics of this Recommendation are as follows:

a) use over metallic local loops;

b) provisions to exchange capabilities information between DSL equipment to identify common modes of operation;

c) provisions for DSL equipment at either end of the loop to select a common mode of operation or to request the other end to select the mode;

d) provisions for exchanging non-standard information between DSL equipment;

e) provisions to exchange and request service and application-related information;

f) support for both duplex and half-duplex transmission modes;

g) support for multi-pair operation;

h) provisions for DSL equipment at the remote end of the loop (xTU-R) to propose a common mode of operation (new in version 2 of the Recommendation through the use of new message type MP and its associated transactions);

i) support for a re-transmission mechanism (new in version 3 of the Recommendation through the use of new message type REQ-RTX).

j) support for exchanging the relative transmit and receive level of individual carriers in order to estimate loop characteristics.

Document History

ITU-T G.994.1
November 1, 2018
Handshake procedures for digital subscriber line transceivers
This Recommendation defines signals, messages and procedures for exchanging these between digital subscriber line (DSL) equipment, when the modes of operation of the equipment need to be...
March 1, 2018
(Pre-Published) Handshake procedures for digital subscriber line transceivers Amendment 2
A description is not available for this item.
December 1, 2017
Handshake procedures for digital subscriber line transceivers Amendment 1
A description is not available for this item.
December 1, 2017
(Pre-Published) Handshake procedures for digital subscriber line transceivers Amendment 9
A description is not available for this item.
April 1, 2017
Handshake procedures for digital subscriber line transceivers Amendment 8
A description is not available for this item.
April 1, 2017
Handshake procedures for digital subscriber line transceivers
This Recommendation defines signals, messages and procedures for exchanging these between digital subscriber line (DSL) equipment, when the modes of operation of the equipment need to be...
October 1, 2016
Handshake procedures for digital subscriber line transceivers Corrigendum 1
A description is not available for this item.
June 1, 2016
Handshake procedures for digital subscriber line transceivers Amendment 7
A description is not available for this item.
August 1, 2015
Handshake procedures for digital subscriber line transceivers Amendment 6 – Codepoints for the support of ITU-T G.993.2 profile 35b
A description is not available for this item.
February 1, 2015
Handshake procedures for digital subscriber line transceivers Amendment 5: Additional codepoints for the support of SAVN
A description is not available for this item.
December 1, 2014
Handshake procedures for digital subscriber line transceivers Amendment 4 – Additional codepoints for the support of ITU-T G.9701
A description is not available for this item.
January 1, 2014
Handshake procedures for digital subscriber line transceivers Amendment 3: Codepoints for ITU-T G.998.4 extensions and exchange of transfer ID
A description is not available for this item.
August 1, 2013
Handshake procedures for digital subscriber line transceivers Amendment 2 – Extended duration of new functionality O-P-VECTOR 1
A description is not available for this item.
October 1, 2012
(Pre-Published) Handshake procedures for digital subscriber line (DSL) transceivers Amendment 1
A description is not available for this item.
June 1, 2012
Handshake procedures for digital subscriber line transceivers
This Recommendation defines signals, messages and procedures for exchanging these between digital subscriber line (DSL) equipment, when the modes of operation of the equipment need to be...
December 1, 2011
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 8
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
October 1, 2011
Handshake procedures for digital subscriber line (DSL) transceivers Corrigendum 1
A description is not available for this item.
April 1, 2011
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 7
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
November 1, 2010
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 6: New code points and correction of D0 values
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
April 1, 2010
(Pre-Published) Handshake procedures for digital subscriber line (DSL) transceivers Amendment 5
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
June 1, 2009
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 4: Appropriate carrier set when the remote handshake transceiver unit supports ITU-T G.992.3/5 Annex B
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
March 1, 2009
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 3
A description is not available for this item.
April 1, 2008
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 2
Summary Amendment 4 to Recommendation ITU-T G.994.1 contains a modification of the status of J43 carrier set when used by HSTU-R supporting G.992.3/5 Annex B.
November 1, 2007
Handshake procedures for digital subscriber line (DSL) transceivers Amendment 1
A description is not available for this item.
February 1, 2007
Handshake procedures for digital subscriber line (DSL) transceivers
A description is not available for this item.

References

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