Bit switching of word synchronized data

Details Bit switching of word synchronized data Bit switching of word synchronized data

H - Electricity

04

Q

363/13, 344/25

H04Q 11/04 (2006.01) H04J 3/06 (2006.01)

Patent

CA 1089962

ABSTRACT The invention relates to a digital data switch for serially bit-switching word synchronized Pulse Code Modulated (PCM) data from inlets to outlets of the switch. The switch is particularly intended for use in situations wherein PCM data words arriving at the switch on different inlets are not aligned in so far as word boundaries are concerned. The PCM data is bi-polar or diphase modulated and the synchronization information of each word consists of a violation of the modulation. The switch includes a demodulator on each inlet for demodulating the data and a synchronization detect circuit associated with each demodulator for detecting the synchronization information in each incoming data word. The switch has two functionally identical time division multiplexed switch paths; one being a data path and the other being a by-path for switching the syn- chronization information. The synchronization information is thereby switched simultaneously through the switch in parallel with the associated data word such that both the data word and synchronization information arrive at the appropriate outlet according to the connection required through the switch. Each outlet has a modulator for receiving the data word and syn- chronization information and bi-polar or diphase modulating the outgoing data from the switch and causing an appropriate violation of the modulation in response to the synchronization information. A method of switching data is also claimed.

286790

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