Ostrolenk, Faber, Gerb & Soffen, LLP
Multiplexer with transmission back-up function
 Multiplexer/de-multiplexer units 201 to 296 directly multiplexes or de-multiplexes data signals from terminals. A leased line allotting unit 20 normally allotting all time slots on a multiplexed signal bus 25 to the side of a high rate 6 Mbps digital leased line 3. Switched line allotting units 21 to 24 execute allotting, in the event of a trouble in the leased line, the multiplexed signal time slots on the multiplexed signal bus in four divisions to the side of respective 1.5 Mbps switched lines 41 to 44 through transmission rate conversion. A control unit executes a time slot allotting change. 
NEC Corporation
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Masahiko Tunetoshi
Saito Mizusawa