The Hull Speed AMX-1 Asynchronous Multiplexer is a two-channel, character oriented, time division multiplexer which can be used to derive two asynchronous data channels from a single full-duplex, synchronous composite link.
The two sub-channels operate at matched speeds half of the composite link speed. All standard codes, with or without parity, are supported. Configuration parameters are strap selectable. Indicators for both power and sync are provided.
The AMX-1 is compatible with 7 or 8-bit asynchronous formats using either 1 or 2 stop bits, with or without parity. This makes the AMX compatible with most async devices. This flexibility allows terminals with different formats to share the same modem or multiplexer port.
Data rate control of the AMX-1 is set by the associated transmission link equipment, i.e. modem or digital service unit. The synchronization is achieved by reducing the throughput of one port only 0.2 percent. This means the AMX-1 requires only one bit out of each 1024 transmitted to maintain end to end synchronization. This small reduction is virtually invisible to almost all applications and terminals. The technique or method used by the asynchronous devices does not inhibit the AMX's ability to maintain its own synchronization.
The AMX-1 derives two ports of asynchronous data from one synchronous or asynchronous data link of up to 19,200 bps.