  The terse real-time data collection dept 
 The Question is:
 
I have 10BASE5 EtherNET LAN network ,system is VAX4000/200 and VMS5.5-1,
I want to commiuntion(real-time) to a another network system ,is fast100M
 Ethernet(windows NT system),how can I do that?
please tell me,include software and hardware.
 
thanks!
 
 The Answer is:
 
  Given that the Q22-bus (Q-bus) itself supports a bandwidth of roughly
  3 megabytes per second and given that most network I/O will travel the
  Q-bus twice (from disk to processor and processor to network), the
  bandwidth potentially available will obviously be rather less than
  that of a Fast Ethernet network.
 
  You require a 10-100 bridge for the network (this is a bi-directional
  10 megabit to 100 megabit Ethernet adapter), or a Q-bus Fast Ethernet
  controller for the VAX 4000 model 200 series, or you will want to
  upgrade to a more recent OpenVMS system with a (far) faster I/O bus.
 
  The phrase "real-time" is ambigious in most contexts.  You will want to
  specify the required peak and aggregate bandwidth values, the maximum
  permissible latency, and the penalty (if any) if a packet is missed.
  These characteristics and values all tend to be implementation-specific.
 
  OpenVMS VAX itself can directly access the network for raw I/O (via
  $qio system service calls), or you can use most any networking protocol
  (eg: IP).  For examples of the former, see the I/O User's Reference
  Manual.  For the latter, see the product documentation for the I/O stack,
  such as the TCP/IP Services for OpenVMS documentation.
 
  You may also be able to move the data capture directly to the OpenVMS
  system and avoid the latency that is inherent in a CSMA/CD Ethernet
  network, and in most network protocols, and when multiple operating
  systems are involved.
 
