Technical information

2.3 Communications Options
The VAX 4000 Model 200 system supports the following communications
options:
• CXA16 asynchronous multiplexer (16 lines)
• CXB16 asynchronous multiplexer (16 lines)
• CXY08 asynchronous multiplexer (8 lines)
• DESQA Ethernet controller
• DFA01 asynchronous controller with integral modem
• DPV11 synchronous interface
• DSRVB DECserver 200
• DSV11 synchronous controller
Asynchronous Serial Controllers
Asynchronous serial controllers provide low-speed connections between
peripheral devices and the system. Asynchronous communications between
the system and the peripheral depends on recognition of a pattern of start
and stop bits, not on a time interval.
Synchronous Serial Controllers
Synchronous serial controllers provide high-speed connections between
systems. Communication between synchronous devices depends on time
intervals that are synchronized before transmission of data begins.
Ethernet Controllers
Ethernet controllers connect your system to an Ethernet network. With
a network connection and appropriate DECnet software, you can use all
network services.
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