| US 7,512,121 B1 | ||
| T1 grooming translation of yellow alarms | ||
| Jason N. Morgan, Brownsboro, Ala. (US); and Andrew T. Ruble, Harvest, Ala. (US) | ||
| Assigned to Adtran, Inc., Huntsville, Ala. (US) | ||
| Filed on Feb. 18, 2005, as Appl. No. 11/60,866. | ||
| Int. Cl. H04L 12/50 (2006.01); H04J 3/06 (2006.01) | ||
| U.S. Cl. 370—358 [370/522; 370/535] | 24 Claims |
| 1. A method of transporting alarms contained within a fractional digital communication signal frame through a digital access
and cross-connect system (DACS), comprising the steps of:
(a) receiving fractional digital communication signal frames at input ports of said DACS;
(b) in response to detecting the presence of an alarm indication within a fractional digital communication signal frame received
in step (a), storing information representative of said alarm indication; and
(c) generating at an output port of said DACS a composite digital communication signal frame comprised of multiple fractional
digital communication signal frames, as well as an alarm code representative of said alarm indication, wherein in a D4 super
framing (SF) format, the second most significant bit of each twenty-four bytes of a composite T1 frame containing at least one fractional DS1 (Digital Signal 1) carrying alarm information is set to a “0,” irrespective of whether the bytes are valid DS0s (Digital Signal 0s).
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