Frame code converter
AssigneeAmdahl Corporation
InventorJohn R. Piercy
Life of this patent
Estimating the term…
Abstract
An apparatus for converting a frame code from a T-1 multiplexed data stream having a framing pattern in a first preselected format such as DMA-1, to a frame code in an output data stream having a framing pattern according to a second preselected format such as D2/D4. A data path is connected to receive the data stream for supplying the output data stream. Framing windows in the data stream are identified and modified by combining with a selected frame code modifier. The output data stream is then supplied to a T-1 receiver circuit adapted to the second preselected format.
Claims16
In a system receiving a time multiplexed data stream organized in frames and a clock signal synchronized with the data stream, each frame including a plurality of multibit channels and a frame code, a plurality of frames making up a superframe and the frame codes from the plurality of frames in a superframe making up a framing pattern with a preselected format, an apparatus for converting a frame code from the received data stream having a framing pattern in a first preselected format to a frame code in an output data stream having a framing pattern according to a second preselected format, comprising:
- a data path connected to receive the data stream
- framing means, connected to receive the clock signal, for identifying framing windows in the data stream;
- modifying means, in communication with the framing means, for generating a frame code modifier for identified framing windows;
- and
- combining means, connected to the data path and the modifying means, for combining the frame code modifier with the data stream in the framing window to supply the output data stream.
In a system receiving a time multiplexed data stream organized in frames and a clock signal synchronized with the data stream, each frame including a plurality of multibit channels and a frame code, a plurality of frames making up a superframe and the frame codes from the plurality of frames in a superframe making up a framing pattern with a preselected format, an apparatus for converting a frame code from the received data stream having a framing pattern in a first preselected format to a frame code in an output data stream having a framing pattern according to a second preselected format, comprising:
- a data path connected to receive the data stream
- first counter means for counting bits of data in the received data stream to identify framing windows;
- code storage means for storing a plurality of frame code modifiers;
- second counter means, in communication with the first counter means, for counting framing windows to generate a modifier count;
- selector means, in communication with the code storage means and the second counter means, for selecting a frame code modifier in response to the modifier count;
- and
- combining means, connected to the data path and the selector means, for combining the frame code modifier with the received data stream in the identified framing window to supply the output data stream.
Dependencies are inferred from the claim text.