Asynchronous line interface rate adaptation to the physical...

Details Asynchronous line interface rate adaptation to the physical... Asynchronous line interface rate adaptation to the physical...

2006-09-20

2010-11-02

Ngo, Ricky (Department: 2464)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S428000, C370S395430

Reexamination Certificate

active

07826488

ABSTRACT:
A method for adapting the rates of a certain number of asynchronous HDLC channels (15) to a single clock domain suited for interfacing with an HDLC processor (13) through a synchronous pseudo-TDM interface (14) in which the HDLC channels are multiplexed in time and vice versa in the opposite direction. In one direction the algorithm is based on the writing of the HDLC channels in a dedicated buffer (17) and in reading these buffers with a common synchronous clock just above the expected maximum HDLC rate. The under-run condition is avoided by inserting neutral information between the end byte and the start byte of the HDLC packets when this is suggested by the buffer fill monitoring function. A simple function to locate the first and last bytes of each HDLC packet read by the buffer is hence used in combination with the buffer fill monitoring function. The algorithm is also suited in the opposite direction in which different asynchronous physical lines receive their HDLC channels from a synchronous TDM-type interface on condition that this interface clock domain be just below the minimum expected HDLC output rate. In this case also the under-run conditions are avoided by insertion of neutral data after having used the same algorithm described above. Adaptation devices and a telecommunications card using them are also proposed.

REFERENCES:
patent: 3742145 (1973-06-01), Clark et al.
patent: 5305308 (1994-04-01), English et al.
patent: 6188699 (2001-02-01), Lang et al.
patent: 6516004 (2003-02-01), Douady et al.
patent: 2004/0008713 (2004-01-01), Knight et al.

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