Time-alignment of crosstalk acquisition phases between multiple joining lines
View Patent ↗In an embodiment, the access node includes first and second transceiver units for initializing first and second communication channels, respectively, over first and second communication lines, respectively. The initialization of the first and second communication channels respectively including first and second handshake phases wherein peer transceiver units exchange capabilities and select (i) a common mode of operation, (ii) first and second crosstalk channel acquisition phases from the first and second communication lines, and (iii) first and second generic initialization phases. The access node further includes a line initialization controller configured to stretch the execution of the first handshake phase with respect to the execution of the second handshake phase so as to shorten a time difference between respective entries into the first and second crosstalk channel acquisition phases.
1. An access node for providing broadband communication services to subscribers, and comprising a first transceiver unit for initializing a first communication channel over a first communication line and a second transceiver unit for subsequently initializing a second communication channel over a second communication line, which initialization of said first and second communication channels respectively comprising first and second handshake phases whereby peer transceiver units exchange capabilities and select a common mode of operation, first and second crosstalk channel acquisition phases from said first and second communication lines into further active communication lines, and further first and second generic initialization phases, wherein said access node further comprises a line initialization controller configured to stretch the execution of said first handshake phase with respect to the execution of said second handshake phase so as to shorten a time difference between respective entries into said first and second crosstalk channel acquisition phases.
2. The access node of claim 1 , wherein said first transceiver unit is further configured to, under control of said line initialization controller, reiterate through a particular message exchange during said first handshake phase with a number of iterations of said particular message exchange during said first handshake phase greater than a respective number of iterations of said particular message exchange during said second handshake phase.
3. The access node of claim 2 , wherein said particular message exchange comprises the exchange of a Capability List Request CLR message, a Capability List CL message and a Mode Selection MS message,
and wherein said first transceiver unit is further configured to reiterate through said particular message exchange by issuing a Request REQ-CLR message for a Capability List Request CLR message.
4. The access node of claim 1 , wherein said first transceiver unit is further configured to, under control of said line initialization controller, intentionally delay response messages during said first handshake phase by an amount of time averagely greater than a respective amount of time used during said second handshake phase.
5. The access node of claim 2 , wherein said second transceiver unit is further configured to, under control of said line initialization controller, intentionally delay response messages during said second handshake phase by an amount of time averagely greater than a respective amount of time used during said first handshake phase.
6. The access node of claim 1 , wherein stretching the execution of said first handshake phase with respect to the execution of said second handshake phase is conditioned by initialization of said first and second communication channels being requested no longer than a joining time period apart.
7. The access node of claim 6 , wherein duration of said joining time period is dynamically adjusted in dependence of an operational context.
8. The access node of claim 1 , wherein said access node is a Digital Subscriber Line Access Multiplexer DSLAM, and wherein said first and second communication channels are Digital Subscriber Line DSL channels.
9. A method for initializing communication channels over communication lines, and comprising the steps of initializing a first communication channel over a first communication line and subsequently initializing a second communication channel over a second communication line, which initialization of said first and second communication channels respectively comprising first and second handshake phases whereby peer transceiver units exchange capabilities and select a common mode of operation, first and second crosstalk channel acquisition phases from said first and second communication lines into further active communication lines, and further first and second generic initialization phases, wherein said method further comprises the step of stretching the execution of said first handshake phase with respect to the execution of said second handshake phase so as to shorten a time difference between respective entries into said first and second crosstalk channel acquisition phases.
10. The method of claim 9 , wherein stretching the execution of said first handshake phase with respect to the execution of said second handshake phase is achieved by reiterating through a particular message exchange during said first handshake phase with a number of iterations of said particular message exchange during said first handshake phase greater than a respective number of iterations of said particular message exchange during said second handshake phase.
11. The method of claim 10 , wherein said particular message exchange comprises the exchange of a Capability List Request CLR message, a Capability List CL message and a Mode Selection MS message, and wherein reiteration through said particular message exchange is achieved by issuing a Request REQ-CLR message for a Capability List Request CLR message.
12. The method of claim 9 , wherein stretching the execution of said first handshake phase with respect to the execution of said second handshake phase is achieved by intentionally delaying response messages over said first communication line by an amount of time averagely greater than a respective amount of time used over said second communication line.
13. The method of claim 10 , wherein said method comprises the further step of intentionally delaying response messages during said second handshake phase by an amount of time averagely greater than a respective amount of time used during said first handshake phase.
14. The method of claim 9 , wherein stretching the execution of said first handshake phase with respect to the execution of said second handshake phase is conditioned by initialization of said first and second communication channels being requested no longer than a joining time period apart.
15. The method of claim 14 , wherein duration of said joining time period is dynamically adjusted in dependence of an operational context.