Multiplex communications – Wide area network – Packet switching
Patent
1986-01-24
1987-10-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
H04J 306
Patent
active
046988068
ABSTRACT:
A frame alignment method and apparatus are disclosed for aligning the t.d.m. frames of tributaries, each including channel bytes synchronously multiplexed with a frame synchronizing byte, which are byte-interleaved to form overall t.d.m. frames identified by a frame synchronizing word, the tributaries having arbitrary frame phases with respect to one another. A channel counter is reset in response to the frame synchronizing word, and for each tributary in response to the frame synchronizing byte the count of the channel counter is used to determine an offset value which is stored in a memory. Each byte of each tributary is stored in a RAM at an address determined by substracting the respective tributary offset from the current count of the channel counter, whereby the tributaries are stored in the RAM in a frame-aligned manner. Reading of the tributary bytes can be effected sequentially or via a connection memory providing a time switching function.
REFERENCES:
patent: 3676599 (1972-07-01), Heetman
patent: 3790716 (1974-02-01), Herry et al.
patent: 3798378 (1974-03-01), Epstein
patent: 4135060 (1979-01-01), Heckel et al.
patent: 4531210 (1985-07-01), Perry
Graves Alan F.
Littlewood Paul A.
Haley R. John
Marcelo Melvin
Northern Telecom Limited
Olms Douglas W.
LandOfFree
Frame alignment of tributaries of a t.d.m. bit stream does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Frame alignment of tributaries of a t.d.m. bit stream, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frame alignment of tributaries of a t.d.m. bit stream will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2122573