Multiplex communications – Wide area network – Packet switching
Patent
1992-11-02
1996-08-06
Lee, Thomas C.
Multiplex communications
Wide area network
Packet switching
370 581, 3701051, 364DIG1, 36424295, 3642844, 364DIG2, 364919, 3649423, 3649421, G06F 1336, H04L 522
Patent
active
055443249
ABSTRACT:
A data communication system, such as a local area network, is provided with a capability of transmitting isochronous data. Preferably the system conveys both isochronous data and non-isochronous data by time-multiplexing the data into a recurring frame structure on a four-bit nibble basis. Bandwidth available for a particular isochronous source/sink is selectable and sustainable with a predefined granularity. Data rates can be adjusted by using "rate adjustment" time slots which can transmit data in some frames and "no data" in other frames. A particular time frame or template is provided which accommodates isochronous data, non-isochronous data, D channel data, maintenance data and frame synchronization signals. Non-isochronous operation and bandwidth allocation is independent and transparent to the isochronous data activity. Frame timing can be coordinated with one or more reference clock signals, e.g., from a public telephone or wide area network. A buffer can convert between the source/sink or hub circuitry data rates and the data rates for transmission over the physical media which, for a given type of data, is discontinuous on a small time scale.
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Edem Brian C.
Worsley Debra J.
Dinh D.
Lee Thomas C.
National Semiconductor Corporation
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